Chemistry Homework Questions & Answers Archive

When copper metal is added to nitric acid, the following reaction takes place Cu(s) + 4 HNO3(aq) -> Cu(NO3)2(aq) + 2 H2O(l) + 2 NO2(g) Calculate the volume in liters of NO2 gas collected over water at 25.0°C when 2.29 g of copper is added to excess nitric acid if the total pressure is 726.0 mmHg. The vapor pressure of water at 25.0°C is 23.8 mm Hg.

A generic Lewis structure is given where Y represents the central atom and the outer atoms are represented by X. The outer atoms are not necessarily all the same element. Which compound is represented by the generic Lewis structure? HClO3 CHF3 SF4 XeF4

Advanced General Chemistry Calculating an equilibrium constant from an equilibrium composition Ammonia decomposes to form nitrogen and hydrogen, like this: 2 NH3(g) → N2(g) + 3 H2(g) Also, a chemist finds that at a certain temperature the equilibrium mixture of ammonia, nitrogen, and hydrogen has the following composition: compound concentration at equilibrium NH3 0.53 M N2 0.11 M H2 0.94 M Calculate the value of the equilibrium constant Kc for this reaction. Round your answer to 2 significant digits. Kc =

Assign oxidation numbers to all elements in this reaction. What compound was oxidized, what compound was reduced, and balance the reaction. (15pts) Ru2 O3(s) + ... CO(g) → ... Ru(s) + ... CO2(g)

Advanced General Chemistry Calculating an equilibrium constant from an equilibrium composition Morgan , hydrogen bromide and oxygen react to form bromine and water, like this: 4 HBr(g) + O2(g) -> 2 Br2(g) + 2 H2O(g) Also, a chemist finds that at a certain temperature the equilibrium mixture of hydrogen bromide, oxygen, bromine, and water has the following composition: Compound Pressure at equilibrium ------ HBr 79.3 atm O2 60.9 atm Br2 80.9 atm H2O 21.7 atm Calculate the value of the equilibrium constant Kp for this reaction. Round your answer to 2 significant digits.

Calculate the mass of hydrazine (N2H4) that contains a trillion (1.000 x 10^12) hydrogen atoms. Be sure your answer has a unit symbol if necessary, and round it to 4 significant digits.

How many carbon atoms are found in one dozen methane molecules?

A similar sort of experiment could be carried out using quite a few other combinations of chemicals. An example is the combination of Na2SO4 and Ba(NO3)2 to form BaSO4. Suppose in conducting the experiment with those substances it was found that the addition of Na2SO4 to the supernatant produced a precipitate. Which of the two species is the limiting reactant in that case? Explain your reasoning.

Problem 1 (25 pts) USE ELEMENT BALANCES TO SOLVE. One of the most common commercial methods for the production of pure silicon that is to be used for the manufacture of semiconductors is the Siemens process of chemical vapor deposition (CVD). A chamber contains a heated silicon rod and a mixture of high-purity trichlorosilane mixed with high-purity hydrogen that is passed over the rod. Pure silicon (EGS-electronic grade silicon) deposits on the rod as a polycrystalline solid. (Single crystals of Si are later made by subsequently melting the EGS and drawing a single crystal from the melt.) The reaction is H2(g) + SiHCl3(g) → Si(s) + 3 HCl(g) The rod initially has a mass of 1460 g, and the mole fraction of H2 in the exit gas is 0.223. The mole fraction of H2 in the feed to the reactor is 0.580, and the feed enters at the rate of 6.22 kg mol / hr. 1a) Draw and label the system and streams. Clearly label your control volume. 1b) List and count all Unknowns. 1c) List and count all independent Equations. Clearly write out the element balance for each atomic species (Si, H, Cl). 1d) Determine the Degrees of Freedom (DOF). 1e) Solve for: what will be the mass of the rod at the end of 20 min?

At 84.9°C and 718 torr, calculate the number of moles and mass of 7.30 L of N2 gas. Round your answer to 3 significant figures.

Question 18 of 20 The empirical formula of a compound is CH2O. It has a molar mass of 180 g/mol. Which of the following represents its molecular formula? A C3H6O3 B C2H4O2 C C6H12O6 D C5H10OO5 E CHO

What is the mass percentage of O in C3H3O2? A 21.03% B 57.94% C 72.58% D 42.06%

The preparations of two aqueous solutions are described in the table below. For each solution, write the chemical formulas of the major species present at equilibrium. You can leave out water itself. Write the chemical formulas of the species that will act as acids in the 'acids' row, the formulas of the species that will act as bases in the 'bases' row, and the formulas of the species that will act as neither acids nor bases in the 'other' row. You will find it useful to keep in mind that NH3 is a weak base. 1.2 mol of HNO3 is added to 1.0 L of a 1.2 M NH3 solution. - acids: - bases: - other: 0.05 mol of KOH is added to 1.0 L of a solution that is 0.6 M in both NH3 and NH4Br. - acids: - bases: - other:

Provide the IUPAC name for the starting material. 2-bromo-3,3-dimethylbutane What type of compound is the starting material? alkane

Consider the A atom and the A^2- ion. Which will have the larger radius? Multiple Choice the A^2- anion the A^2- cation the A atom They will both have identical radii. Cannot be determined from the information provided.

How many moles of IO contain 8.06 × 10^27 molecules of IO?

Repeat Experiment #2 using acetic acid unknown #2. Begin by measuring 5.00 mL of the unknown acetic acid solution using a 10 mL graduated cylinder. Add this to a 150 mL Erlenmeyer flask, along with 75.0 mL of water and 2 drops of phenolpthalein. Titrate the unknown using the 0.100 M NaOH solution. Perform this titration in triplicate, and report the average concentration of acetic acid determined from the three titrations.

What is the name of the compound shown here? Enter the name of the compound.

5. The maximum number of electrons in a) n=3 18 b) 4 d 10 c) One orbital by the name of 3 p Q d) Shell 4 e) Subshell g 6. Write an chemical equation that goes with... a) heat of combustion of Mg . b) heat of formation of PBr3(s) c) First ionization energy of Na .

Section IX: Draw the following line-bond structures a) 3-ethyl-2,3-dimethyl hexane b) 2,2-dimethylpropane c) 3-ethyl-4-methylheptane

9. Write the balanced chemical equation for the equilibrium that is established when acetic acid is dissolved in water. Include the chemical formulas for all reactants and products, any stoichiometric coefficients and all physical states. Recall that when a substance is dissolved in water, the physical state in a chemical reaction is aqueous (aq). Solve here: CH3COOH(aq) + H2O(l) ⇌ CH3COO^-(aq) + H3O^+(aq) 10. Based on the reaction in Question 9, write the expression for the equilibrium constant (Ka) of acetic acid.

A medical technician is working with the four samples of radionuclides listed in the table below. Initially, each sample contains 19.00 μmol of the radionuclide. First, order the samples by decreasing initial radioactivity. Then calculate how long it will take for the amount of radionuclide in each sample to decrease to 1 / 4 of the initial amount. sample radionuclide half-life initial radioactivity time for amount of radionuclide to decrease to 1 / 4 of initial amount --- --- --- --- --- A 149 To 65 4 hours 2v hours B 30^62 Zn 9.0 hours 3 ~ hours c 31^68 Ga 68.0 minutes 1 (highest) v minutes D 79^198 Au 3 days 4 (lowest) days

What is the oxidation number of bromine as a reactant and in the product?

What is the electron geometry of SF6?

Part B How many moles of aluminum ions are present in 0.36 moles of Al2(SO4)3? Express the number of moles to two significant figures. nAl= square mol Submit Request Answer Part C How many moles of sulfate ions (SO4 2-) are present in 1.7 moles of Al2(SO4)3? Express the number of moles to two significant figures. square Submit Request Answer

What term is used to describe the state in which molecules are evenly distributed in the available space? 1) Osmosis 2) Equilibrium 3) Diffusion 4) Apoptosis

The element with an electron configuration of 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^8 is in group and period . The element with an electron configuration of 1s^2 2s^2 2p^6 is in group and period .

Si un elemento es capaz de ceder electrones, de tal manera de para cumplir con la regla del octeto forma el ion +2, el elemento pertenece al grupo: (A) A (B) IIIA (C) VIA (D) IA

What is methane? a greenhouse gas produced by cows a fertilizer an herbicide a pesticide

Pregunta 13 1 punto 1)Cuál es el número de particulas subatómicas del núcleo para el siguiente catión: ^4020 Ca^+2 (A) 40 p+18 e- (B) 19 p+19 e-20 n^circ (C) 20 p+20 n^circ (D) 20 p+18 e-20 n^circ

Are any of them s orbitals? yes no List the s orbitals, if any. Are any of them p orbitals? yes no List the p orbitals, if any.

A television show conducted an experiment to study what happens when buttered toast is dropped on the floor. When 43 buttered slices of toast were dropped, 24 of them landed with the buttered side up and 19 landed with the buttered side down. Use a 0.10 significance level to test the claim that toast will land with the buttered side down 50% of the time. Use the P-value method. Use the normal distribution as an approximation to the binomial distribution. After that, supposing the intent of the experiment was to assess the claim that toast will land with the buttered side down more than 50% of the time, write a conclusion that addresses the intent of the experiment. Let p denote the population proportion of all buttered toast that will land with the buttered side down when dropped. Identify the null and alternative hypotheses to test the claim that buttered toast will land with the buttered side down 50% of the time. H0: p = 0.50 H1: p ≠ 0.50

What is the charge on an oxide ion? +1 -2 -1 +2

Rock candy is made from an unsaturated solution of sugar and water. a saturated solution of sugar and water. a super saturated solution of sugar and water.

Indicate the electron pair geometry and the molecular geometry for each of the six compounds.

peptic ulcer -- bacteria

Describe the difference between molecular and ionic compounds.

Calculate the number of moles of He atoms present in 6.66 g of He.

Question 16 What is the primary purpose of hydrostatic weighing? O To calculate BMI O To measure muscle mass O To assess body density O To calculate body density

Given reaction: H2 + O2 -> H4O2 How much H4O2 can you make(in grams) if you had 20.3 g of H2 and unlimited amount of O2? A) 20.3 g B) 365 g C) 183 g D) 100 g

What is the correct picture of the missing reactant to make a balanced equation? 2 Fe + [?] Cl2 → 2 FeCl3

Draw the skeletal structure of the disulfide formed when the thiol shown is oxidized.

Suppose you mix 15 g of halothane vapor with 23.5 g oxygen gas. If the total pressure of the mixture is 855 mmHg, what are the partial pressures of each gas?

Calculating the heat of reaction from molar reaction enthalpy and the mass... A chemist measures the energy change ΔH during the following reaction: 2 H2O(l) → 2 H2(g) + O2(g) ΔH=572 kJ This reaction is... 0 endothermic. exothermic. Suppose 50.4 g of H2O react. Will any heat be released or absorbed? - Yes, absorbed. Yes, released. No. If you said heat will be released or absorbed in the second part of this question, calculate how much heat will be released or absorbed. Be sure your answer has the correct number of significant digits. kJ

Sample A is a solid yellow cube with a total mass of 50.0 g. The cube is put into a beaker filled with 250 mL of water. The cube collapses into a small pile of orange powder at the bottom of the beaker. When this powder is filtered out, dried and weighed, it has a total mass of 29.9 g. If the experiment is repeated with 500 mL of water, the powder that's left over has a mass of 30.0 g. - Sample B is 100 mL of a clear liquid. The density of the liquid is measured, and turns out to be 0.77 g/mL. The liquid is then heated in a flask until it boils. The vapor that rises off the boiling liquid is collected for 10 minutes and cooled until it condenses into a separate beaker. The density of the liquid that remains in the flask is then measured, and turns out to be 1.04 g/mL.

Question 44 5 Points The Ksp of Ag2CO3(s) is 8.10 x 10^-12 a. Calculate the solubility of Ag2CO3(s) in water in mol / L. (The answer should have 3 sig figs)

How many milliliters of a 0.352 MM NaOH solution are needed to react with 0.0250 L of 0.275 MM HCl? NaOH(aq) + HCl(aq) -> NaCl(aq) + H2O(l) 19.5 mL 2.42 mL 32.0 mL 0.0195 L

Which of the following is a natural cause of groundwater pollution? landfills rocks runoff

Answer each question using full sentences and show all your work for any calculations. Ensure to use the GRASS method (Given, Required, Analysis, Solution, Statement) for questions involving calculations. 1. Biofuel, any fuel derived from biomass (i.e., plant or algae materials, or animal waste), is considered a renewable energy source. One way of generating liquid biofuel, also known as ethanol, is to ferment starch or sugar found in corn plants. The balanced chemical equation, in the presence of yeast acting as a catalyst, is as follows: C6H12O6(aq) → 2 C2H5OH(aq)+2 CO2(g) The enthalpy change for the reaction is -67 kJ . Is this reaction considered endothermic or exothermic? Explain your reasoning and provide a rationale for what this indicates in terms of heat absorption or emission. [2 marks]

As operaçōes farmacêuticas correspondem aos procedimentos empregados na preparação da matéria-prima que será utilizada nas diversas formas farmacêuticas. Dentre as operações farmacêuticas apresentadas nas alternativas, qual não representa uma operação utilizada no preparo de pós? Dissolução. Tamisação. Pesagem. Moagem. Mistura.

The reactants for a certain chemical reaction are shown. Which of the following shows the correct product or products of this reaction? A. C2H6O7 B) 2 CO3+3 H2 C 3 H2O+2 CO D 2 CO2+3 H2O

How many grams of urea are produced from 17.0 g of glycine? Express your answer with the appropriate units.

Calculate the free energy per mole to transport calcium ions up a concentration gradient from 0.002M to 0.015M at 37 Celsius

How many moles of N2 reacted if 0.50 mol of NH3 is produced?

Estabilidade de um medicamento, é o período de tempo no qual o produto mantém (dentro de limites estabelecidos e sob determinadas condições ambientais) as mesmas características físicas, químicas e farmacológicas, durante seu período de vida útil. Mudanças de cor, odor, precipitação, turvação, servem de alerta indicando sinais de instabilidade no IFA e/ou medicamento. Esses sinais são resultados de fatores que podem levar à degradação. Que tipo de fatores são esses? A Acelerado, de longa duração e de acompanhamento. B Físicos (vibrações e impactos) e Químicos (presença de sais). C Químicos (vibrações e impactos) e Físicos (presença de sais). D Extrínsecos (temperatura, umidade e luz) e intrínsecos (oxidação e hidrólise). E Intrínsecos (temperatura, umidade e luz) e extrínsecos (oxidação e hidrólise).

Now examine salts containing the halide anions, Cl^- and Br-. Most of these are soluble. What two cations listed lead to insoluble halide salts?

Write the chemical symbol for an element in Period 7 and Group 1A.

In this lab we will be building a voltaic cell using Cu / Cu^2+ and Zn / Zn^2+. Write the two half reactions (one as a reduction and one as an oxidation based on forming a spontaneous reaction) and write the combined reaction. (Similar to equations 1-3 in the background reading, but for our system specifically). Use your balanced reactions to answer the questions.

A typical bottle of "Milk of Magnesia" contains 75 grams of MAGNESIUM HYDROXIDE. Show how to calculate the mass of MAGNESIUM SULFATE and the mass of SODIUM HYDROXIDE needed to make 75 grams of Mg(OH)2 ? Hint: each answer requires a separate proportion!

Câu 16 (1,5đ). Nguyên tử X có tổng số các loại hạt là 34 , trong đó số hạt mang điện nhiều hơn số hạt không mang điện là 10 . a) Hãy viết cấu hình electron của nguyên tử X và xác định vị trí (ô, chu kì, nhóm) của X trong BTH. b) X thuộc loại nguyên tố s, p, d hay f và cho biết X là kim loại, phi kim hay khi hiếm? Câu 17 (2む). a) Viết cấu hình electron nguyên tử của các nguyên tố: Ne(Z=10), Na(Z=11) và O(Z=8). b) Biểu diễn cấu hình electron của các nguyên tố trên theo ô orbital? Xác định số electron độc thân?

VARs is often referred to as quadrature power, or wattless power.

Q1 Question (10 points) A bomb calorimeter has a heat capacity of 3341 J/°C. A sample of cinnamon weighs 1.915 g in the calorimeter resulting in a temperature increase from 25.53° to 31.28°C. 1st attempt: How much heat was created by the combustion of cinnamon? See Periodic Table Get Hint

An atomic anion with a charge of -1 has the following electron configuration: [Ne] 3 s^2 3 p^4 What is the chemical symbol for the ion? How many electrons does the ion have? How many 3 p electrons are in the ion?

The molecular weight of a gas is A) 41 B) 2.7 × 10^-2 g / mol if 3.5 g of the gas occupies 2.1 L at STP. C) 4.6 × 10^2 D) 37 E) 5.5 × 10^3

Colligative properties of solutions are those properties that depend on number of particles

Draw the Lewis structure for a thiol (SH-) ion.

4. Information on how to handle hazardous substances is located in the

Use the References to access important values if needed for this question. When a 27.4 mL sample of a 0.329 M aqueous hydrocyanic acid solution is titrated with a 0.452 M aqueous potassium hydroxide solution, what is the pH after 29.9 mL of potassium hydroxide have been added? pH=

The first four ionization energies ( IE₁ through IE₄ ) of a Period 2 element have the following pattern: Make a reasonable guess about which element this is. Enter its chemical symbol below.

4) Mixing two colorless solutions gives a yellow solution. The evidence for this chemical reaction is: (1point) (a) The emission of light. (b) The formation of a gas: (c) The formation of a solid. (d) Color change.

How many moles of Cr2(CO3)3 are in 100.0 g ?

A geochemist measures the concentration of salt dissolved in Lake Parsons and finds a concentration of 19.59 g · L^(-1). The geochemist also measures the concentration of salt in several nearby non-isolated lakes, and finds an average concentration of 2.23 g · L^(-1). Assuming the salt concentration in Lake Parsons before it became isolated was equal to the average salt concentration in nearby non-isolated lakes, calculate the percentage of Lake Parsons which has evaporated since it became isolated. Be sure your answer has the correct number of significant digits.

Identify and briefly describe the two phases of oxidative phosphorylation

What type of reaction is this? LiClO3 → LiCl + O2 A. decomposition B. neutralization C. single displacement D. combustion E. double displacement

Classify each ionic compound as insoluble or soluble in water. Select the single best answer for each part. Note: Reference the General solubility rules for ionic compounds in water table for additional information. Part 1 of 4 K2SO4 soluble insoluble Part 2 of 4 PbBr2 soluble insoluble Part 3 of 4 Zn(OH)2 soluble insoluble Part 4 of 4 Bi(NO3)3 soluble insoluble

Consider the following Lewis Dot Structure for the molecule SF₆: [Lewis structure diagram of SF₆] Fill in the following blanks with the correct responses. Remember that for the purposes of determining orbital and molecular geometries, double and triple bonds only count as 1 bonding pair (BP). - # of Bonding Pairs (BP) : Answer - # of Lone Pairs (LP) : Answer - BP + LP = : Answer - Orbital geometry : Answer - Molecular geometry : Answer - ∠1(°) = : Answer - ∠2(°) = : Answer - ∠3(°) = : Answer - Are there polar bonds? (Yes/No) : Answer

Question 39 1 pts What is the purpose of PCR (Polymerase Chain Reaction)? To analyze DNA fingerprints To amplify specific DNA sequences To cut DNA at specific sites To sequence entire genomes

A force that determines the chemical properties of an atom is A) a gravitational force. B) an electrical force. C) a friction force. D) a nuclear force. E) none of the above

Calculate the number of oxygen atoms in a 60.0 g sample of vanadium (V) oxide (V2O5). Be sure your answer has a unit symbol if necessary, and round it to 3 significant digits.

Determine whether or not the mixing of each pair of solutions results in a buffer. 150.0 mL of 0.15 M HCl; 135.0 mL 155.0 mL of 0.15 M NH3; 155.0 mL of 0.10 M HCl 225.0 mL of 0.10 M NH3; 250.0 mL of 0.135 M NaOH 155.0 mL of 0.15 M NH3; 175.0 mL of 0.17 M HCl

What is the wavelength of light that would be required to perform the cis-trans isomerization of one molecule of 2-butene? λ= nm TOOLS × 10^y Which region of the electromagnetic spectrum is this wavelength of light within? ultraviolet visible X-ray infrared

What volume is occupied by a 0.792 mol sample of carbon dioxide gas at a temperature of 0°C and a pressure of 1 atm? L

A coloração das hortênsias, muito comum no Sul do nosso País, depende da acidez do solo, podendo ser azuis em solo ácido e rosadas em solo básico. Assim, se adicionarmos calcário (CaCO3) ao solo onde as flores forem plantadas, de modo que uma análise desse solo revele uma concentração hidrogeniônica de 10^-8 mol / L, as hortênsias nascerāo a) azuis, já que o pH do solo será 1,8. b) rosadas, já que o pH do solo será 10,8. c) brancas, já que o pH do solo será neutro. d) rosadas, já que o pH do solo será 8. e) azuis, já que o pH será 4.

π = (circumference) / (diameter) The first digits of π are 3.141592653589793238, but the digits go on forever. For every circle Circumference ÷ Diameter = π The square root of a number that isn't a perfect square is also irrational. For example, √36 is a rational number, because 36 is the square of 6. But √37 is irrational, because 37 is not the square of an integer. Check Your Understanding- Question 1 of 2 Identify each number as rational or irrational. Number Type 4 1/3 Select 8 Select √13 Select √9 Select π Select

Let's start by balancing the following chemical reaction fill in blank C2H5OH(l)+ fill in blank O2(g) → fill in blank. CO2(g)+ fill in blank H2O(g)

Explosions! Which part of the explosion event is NOT considered a chemical change? Click the VIEW THEORY button to get guidance with the question. a) Carbon dioxide expands b) Water vapor is produced c) Ethanol reacts with oxygen d) Ethanol burns

If the reaction below absorbs 1,350 kJ of energy, how many grams of N2O will be produced? (N2O=44.0 g / mol) 2 N2(g)+O2(g) -> 2 N2O(g) Delta Hrxn=+163.2 kJ 364 g 8.27 g 5.01 x 10^3 g 728 g

Let's start by balancing the following chemical reaction fill in blank V(s) + fill in blank O2(g) → fill in blank V2 O5(s)

Given the following compound C8H10N4O2 Answer the following: Given the moles of Hydrogen (H) which of the following is the conversion factor to calculate the moles of C8H10N4O2 ? [Select] 1) 1 mol H / 10 mol C8H10N4O2 2) 10 mol H / 1 mol C8H10N4O2 4) 1 mol C8H10N4O2 / 10 mol H Given the moles of C8H10N4O2 which of the following is the conversion factor to calculate the moles of carbon (C)? [Select] 1) 1 mol C / 8 mol C8H10N4O2 2) 8 mol C / 1 mol C8H10N4O2 3) 8 mol C8H10N4O2 / 1 mol C 4) 1 mol C8H10N4O2 / 8 mol H

Which of the following would be considered a chemical property? 1) reactivity towards water 2) conductivity 3) melting temperature 4) boiling temperature 5) flexibility

In the molecule SF6, how many lone pairs of electrons are found around F?

One of these property types is not like the others. Tap on the one that doesn't belong. Hexane vapors quickly combust in the presence of a flame to produce CO2 gas and water vapor. Lithium metal burns with oxygen to produce a bright red flame. A silver nitrate solution forms a white solid when mixed with blue copper chloride solution. Chlorine is a gas with a yellowish green color.

4.-Respecto a las siguientes proyecciones de Newman para el butano A B C D El orden correcto según energía de repulsión creciente es: a) D < B < C < A b) A < B < C < D c) B < D < A < C d) A = C < B = D e) C < A < D < B 5.- El ácido esteárico es un ácido graso saturado de 18 átomos de carbono presente en aceites vegetales, grasas animales y vegetales. Considerando su estructura mostrada a continuación, indique qué características se esperaría para este compuesto puro. a) Sólido y oxidable b) Sólido y no oxidable c) Líquido y oxidable d) Líquido y no oxidable e) Ninguna de las anteriores

A column on the periodic table is called a group. What properties are generally the same for elements within the same group? Select one or more: Physical state Atomic mass Reactivity with other elements Common oxidation state

2. Al + I2 -> AlI3 3. H2 + Br2 -> HBr

Experiment 2: Suppose a student performed a similar experiment with a different unknown. Given the data in the table, what is the van't Hoff factor of the unknown substance? Kf of water 1.86 C / m freezing point of pure water 0.0 C molality of solution 2.075 mol / kg freezing point of solution -3.86 C i=

(a) Using exponential notation, we can write the cube root of 10 as . (b) Using radicals, we can write 10 to the power of 1/2 as . (c) Is there a difference between the square root of 10 squared and (the square root of 10) squared? Yes No

A Lewis structure for an isomer of C2H2F2 is shown below. Based on this structure, determine if the molecule is polar or nonpolar.

Time Remaining 2 Multiple Choice 4 points The central chemoreceptors of the medulla are sensitive to and hence CO2. Cl- OH H+ O2

hold molecules of food in position (A) taste pore B taste sensor (C) microvilli (D) papillae

When sugar and water are mixed, a clear liquid results. In this scenario, the sugar is considered a . solute solution solvent All of the above

What type of Isomer is shown when the left diagram changes to look like the right diagram? - Structural - Positional - Geometric - Functional

is a chemical pathway that enables muscle cells and liver to store glucose as glycogen.

Molecules of four imaginary substances are sketched in the table below. Each sketch is shaded to show the electrostatic potential at the surface of the molecule. Rank these substances in decreasing order of the strength of the intermolecular forces in them. In other words, choose 1 next to the substance in which the molecules exert the strongest intermolecular forces on each other. Choose 2 next to the substance in which the molecules exert the second strongest intermolecular forces on each other, and so forth. Note: all of the molecules are neutral, and you may assume none of them experience hydrogen bonding.

molecule or polyatomic ion polar or nonpolar? atom closest to negative side HBr ○ polar ○ nonpolar CCl4 ○ polar ○ nonpolar HCN ○ polar ○ nonpolar

The smell of peaches is due to benzyl acetate, and the smell of rum results from 2-methylpropyl propionate. In the boxes below, draw the structures of the carboxylic acids and alcohols that could be used to synthesize each of these esters.

Magnesium is heated in a dish. It reacts with oxygen in the air Solid magnesium oxide is made. What happens to the mass in the dish? It goes up and down It decreases It stays the same It increases I don't know

Match the term on the left with its definition on the right. 1. Abstracts 2. Informative abstracts 3. Proposal abstracts 4. The key features of all abstracts A. 100-200 word statements describing the gist of a report or presentation. B. An abstract prepared to gain approval for a project, experiment, or paper. These stand alone. C. State in one paragraph the essence of a whole paper, study, or research project. D. Provides a summary, includes an objective description, and is brief.

Select all Intermolecular Forces present in the following Compound. Dispersion Forces Permanent Dipole-Dipole Hydrogen Bonding

Convert the following: 42 kg = lb Select one: a. 94.4 lb b. 92 lb c. 93.4 d. 92.4

For each of the following net ionic equations, which species is being oxidized and which is being reduced? Which species is the reducing agent? Which species is the oxidizing agent? a) Cr^+ + Sn^4+ -> Cr^3+ + Sn^2+ b) 3 Hg^2+ + 2 Fe -> 3 Hg + 2 Fe^3+ c) 2 As + 3 Cl2 -> 2 AsCl3

learning.mheducation.com CHM1010NODA4024-General Chemistry I Question Mode: Multiple Select Q Multiple Select Question Select all that apply Which of the following statements correctly describe theoretical yield in a chemical reaction? Select all that apply. The theoretical yield considers the fact that side reactions may occur. The theoretical yield is smaller than the actual yield. The theoretical yield is the maximum amount of product that can be formed. The theoretical yield is the amount of product expected from a given amount of reactant based on the balanced chemical equation Need help? Review these concept resources. I Read About the Concept Rate your confidence to submit your answer. High Medium Low O 2024 McGraw Hill. All Rights Reserved. Privacy Center Terms of Use

Electronic Structure and Chemical Bonding Recognizing s and p orbitals Here are sketches of four electron orbitals: A B C D Are any of them s orbitals? - yes - no List the s orbitals, if any. Are any of them p orbitals? - yes - no List the p orbitals, if any.

Which image represents the ionic compound strontium fluoride, SrF2?

aqueous solutions of hydrobromic acid and strontium hydroxide are mixed together. Balance the molecular equation, what is the coefficients for the hydrobromic acid? fill in blank

□ is the keyboard shortcut to create a new workbook in Excel. Alt+N Windows+N Ctrl+N

Question 33 of 39 Consider the following two compounds. Which of the compounds is more acidic? Compound A Compound B Which factor applies here? Induction Resonance Orbital Atom Bearing a Charge

What is the maximum number of double bonds that a hydrogen atom can form? 0 1 2 3 4

According to solubility rules, which compound should dissolve in water? Select one: CaSO4 K3PO4 AgBr MgCO3

Answer the following questions about the molecule shown below. a) Using proper naming nomenclature, number the carbon atoms in the ring with numbers 1-6 (starting with 1 on the carbon the chlorine is attached to). Then provide the complete name for the molecule. b) Fill in the substituents for the two possible chair conformations for this molecule. The substituent numbers from the structure above should match the substituent numbers on the chair structures below. Pay close attention to whether a substituent is axial or equatorial.

A chemist dissolves 731 mg of pure potassium hydroide in enough water to make up 120 mL of solution. Calculate the pH of the solution. (The temperature of the solution is 25°C.) Round your answer to 3 significant decimal places.

In each pair, choose the atom which has the highest first ionization energy based on its position in the Periodic Table. Mg or S A Mg B S

In chemistry, pH=-log [H+]. Given that C is the original concentration of hydrogen ions in a liquid, and P is the original pH of the liquid, P=-log(C). What is the effect on pH if the concentration of hydrogen ions is increased by a factor of 5? The pH decreased by increased by by Question Help: Message instructor Submit Question Jump to Answer

Anions have a charge. - zero - positive - negative - neutral

Gegeben ist das Dreieck ABC mit A(4-2 2), B(02 2) und C(2-1 4). Stellen Sie die Seitenkanten des Dreiecks als Spaltenvektoren dar. Berechnen Sie den Umfang des Dreiecks.

Although they share many approaches in common, there are several fundamental differences between the polymerase chain reaction (PCR) and Sanger (dideoxy chain termination) sequencing. What are these important differences?

Group 17 always has ions with a charge of -1

The distinctive spiral or pleated sheet of a protein is known as its secondary structure.

A 0.1964 g sample of quinone (C6H4O2) is burned in a bomb calorimeter that has a heat capacity of 1.56 kJ / °C. The temperature of the calorimeter increases b 3.2°C. Calculate the heat of combustion (kJ / mole) of quinone. Ans: -2745 kJ / mol or to 2 sigfigs -2700 kJ / mol

Raising the temperature of 12.0 g of water from 10.0°C to 22.0°C requires 105.0 joule of energy; however, raising the temperature of 12.0 g of copper for the same temperature range requires 22.0 joule. Why is more energy required to heat the water? - water has a larger specific heat capacity than copper - water has larger volume - water has larger density - copper has a larger volume - water has higher potential energy

The combustion of propane produces carbon dioxide gas and water vapor according to the reaction C3H8(l) + 5 O2(g) → 3 CO2(g) + 4 H2O(g) A sample of propane is added to a 260-L container containing excess oxygen to a final pressure of 10.8 atm and combusted at 650 K. Calculate the moles of carbon dioxide gas produced. 158 mol 52.6 mol 210 mol 263 mol

Module 06 Homework Question 11 of 13 (1 point) Question Attempt: 1 of Unlimited Incorrect You've picked the wrong sketch in all cases. There are three sets of sketches below, showing the same pure molecular compound (water, molecular formula H2O) at three different temperatures. The sketches are drawn as if a sample of water were under a microscope so powerful that individual atoms could be seen. Only one sketch in each set is correct. Use the slider to choose the correct sketch in each set. You may need the following information: melting point of H2O: 0.0°C boiling point of H2O: 100.0°C

Some N2 gas is mixed with some O2 gas, and the sketch below shows a representative sample of the mixture. The total pressure of the mixture is measured, and found to be 2.00 atm. key carbon - bigcirc - hydrogen nitrogen - bigcirc - sulfur oxygen - - chlorine Calculate the mole fraction and partial pressure of each gas in this mixture. Round your answers to 3 significant digits. You may assume each gas behaves as an ideal gas. gas - mole fraction - partial pressure N2 - square - square atm O2 - square - square atm

Draw an orbital diagram for the valence electrons of each of the following atoms or ions of elements. Circle 2 of the electrons and identify their 4 quantum numbers. Se

Given the unbalanced equation - Ca(OH)2 +-(NH4)2 SO4 -...+ CaSO4 +... NH3 + H2O What is the sum of all coefficients when the equation is correctly balanced using the smallest whole-number coefficients? (A) 5 (B) 7 (C) 9 (D) 11

¿Cuál será la concentración que tiene una solución de 25 ml con 0.3 g de (NH4)3 PO4?

Which of the following is a heterocyclic compound?

When heated in the presence of H+, menthol reacts to form two alkenes. In the reaction above, which alkene is the major product? Circle it above and justify your answer.

33. Antibiotics only effective against a single organism or disease. a. broad spectrum b. narrow spectrum c. limited spectrum

8-2 Activity Coefficients 4. The Ksp value for PbI2 is 7.9 × 10^-9. a) Neglecting activities, calculate the solubility of PbI2 in a solution that is 0.0500 M in NaI and 0.0100 M in K2SO4. (Disregard any potential soluble complexes that may form.)

In aerobic respiration O2 is the final electron acceptor, whereas in anaerobic respiration another oxidized ion such as NO3^- is the final electron acceptor. Multiple Choice O2 ; NO3^- NO3 ; O2 O2 ; H2O NO3 ; H2O O2 ; NH3

Give the CORRECT IUPAC name for cyclopentane dimethyl methylcyclopentane 1,2-dimethylcyclopentane 3,4-dimethylbutane none of these

Immunodeficiency of C2 and C4 complements is likely to affect MAC formation by the alternate pathway mannan binding pathway all the complement pathways classical pathway

True or False Question Glucose is the primary output of the Calvin cycle. True False

There are REDs (Regions of Electron Density) around the central atom a. 0 b. 1 c. 2. d. 3 e. 4 The shape at the central atom is f. diatomic g. linear h. trigonal planar i. bent (120°) j. tetrahedral k. pyramidal l. bent (109.5°) If all of the bonds are polar covalent, is the molecule itself polar? m. yes n. no

what is the name for the compound NO2?

What is the pH of a 0.0440 M HNO3 solution?

Consider the following reaction at equilibrium. What effect will adding more SO3 have on the system? SO2(g) + NO2(g) = SO3(g) + NO(g) The reaction will shift in the direction of products. The reaction will shift to decrease the pressure. No change will occur since SO3 is not included in the equilibrium expression. The reaction will shift in the direction of reactants. The equilibrium constant will decrease.

Question 2 1 pts A compound comprised of calcium and nitrogen weighs 29.6 g and contains 24.0 g of calcium. What is the empirical formula? CaN3 CaN Ca3 N2 Ca2 N2 Question 3 1 pts A 170.00 g sample of an unidentified compound contains 29.84 g sodium, 67.49 g chromium, and 72.67 oxygen. What is the compound's empirical formula? NaCrO3.5 Na2 Cr2 O7 Na2 CrO7 NaCrO7

Select all that are NOT constitutional isomers of hexane. 2-methylpentane 2,3-dimethylbutane 3-methylpentane 1,3-dimethylbutane 2,2-dimethylbutane 2,4-dimethylbutane

Write the ground-state electron configuration for a neutral atom of each element: manganese iron

During a screening obstetrical examination, an intermittent bladder abnormality is identified. This incidental finding is most consistent with a(n): Sagittal image of the urinary bladder. - catheter balloon - ureterocete - diverticulum - ureteral jet

How many secondary carbons are shown in the molecule shown?

Balance the chemical equation below using the smallest possible whole number stoichiometric coefficients. CH3CH3(g) + O2(g) -> CO2(g) + H2O(g)

A 100 L tank at 45 °C is filled with 110 g of sulfur tetrafluoride gas and 55.6 g of sulfur hexafluoride gas. You can assume both gases behave as ideal gases. Calculate the mole fraction and partial pressure of each gas, and the total pressure in the tank. Round each of your answers to 3 significant digits. Total pressure in tank: sulfur tetrafluoride: molar fraction partial pressure sulfur hexafluoride: molar fraction partial pressure □ atm □ atm □ atm □ atm □ atm

Use standard enthalpies of formation to calculate ΔHr.m° for the following reaction: CaO(s) + CO2(g) → CaCO3(s) Express your answer using four significant figures.

Question 10 (2 points) Find the pH of a solution 1.7 M in KCl. Report your answer to two decimal places.

Given the following chemical equation, identify the Lewis acid: Zn^2+(aq) + 4 NH3(aq) -> [Zn(NH3)4]^2+ (aq) Zn^2+ (aq) NH3(aq) [Zn(NH3)4]^2+ (aq)

1. How many electrons are in the highest occupied energy level of a neutral strontium atom? Write the ground state spdf electron configuration or use the periodic table. Number of electrons:

This assignment will help you to learn the following skills and knowledge: - Determine the acid-base properties of ions and salts from Ka and Kb values of parent compounds 1. Determine whether each anion is basic or neutral. For basic anions, write equations showing how the anion acts like a base. a. C7 H5 O2^- c. I^- Neutral Neutral b. NO3^- d. F^- Basic Basic

Complex Structures: Mastery Test 4. Drag the tiles to the correct boxes to complete the parts of chromium(IV) oxide Cr O₂ Cr O₄ Cr O₃ Cr O

Decide whether each molecule or polyatomic ion is polar or nonpolar. If the molecule or polyatomic ion is polar, write the chemical symbol of the atom closest to the negative side. For example, if the molecule were HCl and you decided the hydrogen atom was closest to the negative side of the molecule, you'd enter "H" in the last column of the table. - molecule or polyatomic ion polar or nonpolar? atom closest to negative side - CH2O polar / nonpolar □ - CH3Cl polar / nonpolar □ - I2 polar / nonpolar □

The account that contains the corporation's cumulative earnings since the corporation was formed minus the dividends it has declared since it began is Common Stock. Income Summary. Retained Earnings. Fees Earned.

Fill in the systematic names of the following chemical compounds. Note: for compounds containing hydrogen, you may give the common name instead. molecular formula name of compound -------------------------------------------------- C₃S₂ BI₃ BP CS₂ H₂O

In water H2O what is the 2 called and what does it mean? A. Coefficient and it means there are 2 water molecules B. Coefficient and it means there are 2 Hydrogens C. Subscript and it means there are 2 Hydrogens D. Subscript and it means there are 2 Oxygen

What is the heat change when 2.42 g of water vapor (steam) at 189.3°C is cooled to 106.1°C? The specific heat of steam is 2.02 J/g°C. Be sure your answer has the correct number of significant figures.

8.2 Homework Question 10 of 12 (1 point) Question Attempt 1 of Unlimited Eat your cereal: Boxes of cereal are labeled as containing 14 ounces. Following are the weights, in ounces, of a sample of 14 boxes. It is reasonable to assume that the population is approximately normal. 13.09 14.96 13.18 13.19 13.17 13.09 13.22 14.96 13.12 13.11 13.18 13.19 13.05 13.04 Part 1 of 2 (a) Construct a 99.5% confidence interval for the mean weight. Round the answers to at least three decimal places. A 99.5% confidence interval for the mean weight is <μ<.

Classify the species as Arrhenius bases, Bronsted-Lowry bases, or Lewis bases in aqueous solution. It is possible for a base to be of more than one type. Which species are Arrhenius bases? NaOH(aq) NH3 (aq) Br^-(aq) Which species are Bronsted-Lowry bases? NaOH(aq) Br^-(aq) NH3(aq)

Highest Kₐ value Lowest Kₐ value Answer Bank CH₃CH₂COOH ClCH₂COOH Cl₂CHCOOH ClCH₂CH₂COOH

Calculating mass density metnyracetate: 0.93 mL/m pentane: 0.63 g/mL glycerol: 1.3 g/mL Next, the chemist measures the volume of the unknown liquid as 1645 cm^3 and the mass of the unknown liquid as 1.30 kg. Calculate the density of the liquid. Round your answer to 3 significant digits: g / mL Given the data above, is it possible to identify the liquid? - yes - no If it is possible to identify the liquid, do so: - ethanolamine - dimethyl sulfoxide - methyl acetate - pentane - Glycerol

Write the balanced equation for each reaction. Phases are optional. The carbonate ion (CO3^2-) acts as a Brønsted base with water. equation: The carbon-containing product from the first reaction acts as a Brønsted base with water. equation: The carbon-containing product from the second reaction decomposes into carbon dioxide gas and water. equation:

Consider the Haber-Bosch process for the synthesis of ammonia from its elements. Calculate the theoretical yield in moles NH3 from the complete reaction of 59.8 grams N2 in the presence of excess H2 gas according to the following balanced chemical equation: N2(g) + 3 H2(g) -> 2 NH3(g)

Give the number of valence electrons for Pb.

CH3CO-O → + H2O → H+

What is the lambda max of this dye? Select one 619 nm 350 nm 473 nm

A chemist carefully measures the amount of heat needed to raise the temperature of a 868.0 mg sample of C9H10O2 from 43.4 °C to 58.8 °C. The experiment shows that 22.9 J of heat are needed. What can the chemist report for the molar heat capacity of C9H10O2? Be sure your answer has the correct number of significant digits. J · mol^-1 · K^-1

In a Fischer projection of a monosaccharide, the aldehyde or ketone group is placed at the top of the structure. A chiral center is represented as the intersection of vertical and horizontal lines. The -OH and -H groups of each of the chiral carbons are on the horizontal intersecting lines. In the following structures, the carbons are included in the structures to aid in the visualization. Monosaccharides are classified as either D or L sugars. Choose the correct statement for the structures. - Structure A is a D sugar and structure B is D sugar. - Structure A is a D sugar and structure B is an L sugar. - Structure A is an L sugar and structure B is an L sugar. - Structure A is an L sugar and structure B is a D sugar.

A hemiacetal is a compound with both an alcohol-like -OH group and an etherlike -OR group bonded to the same carbon atom. An acetal is a compound that has two ether-like -OR groups bonded to the same carbon atom. Identify the structure that contains an acetal.

A 25.0 mL sample of 0.150 M hypochlorous acid is titrated with a 0.150 M NaOH solution. What is the pH at the equivalence point? The Ka of hypochlorous acid is 3.0 x 10^-8. 14.52 10.20 7.00 6.48 7.52

Using the balanced equation for the combustion of acetylene (C2H2), answer the following questions. 2 H-C ≡ C-H+5 O2 → 4 CO2+2 H2O a. How many moles of O2 are needed to react completely with 1.80 mol of C2H2? b. How many moles of C2H2 are needed to form 0.26 mol of CO2?

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