Questions: Select all that apply Which of the following statements correctly describe the procedure used to calculate ΔH° for a reaction using bond enthalpies? Select all that apply. ΔH° is obtained by adding together the absolute values of the bond energies for all bonds broken and formed. ΔHbonds formed is always endothermic. The sum ΔHbonds broken is given a positive value. ΔH for the reaction is given by ΣBE(reactants) - ΣBE(products)

Select all that apply Which of the following statements correctly describe the procedure used to calculate ΔH° for a reaction using bond enthalpies? Select all that apply. ΔH° is obtained by adding together the absolute values of the bond energies for all bonds broken and formed. ΔHbonds formed is always endothermic. The sum ΔHbonds broken is given a positive value. ΔH for the reaction is given by ΣBE(reactants) - ΣBE(products)

Solution

failed
failed

Solution Steps

Step 1: Understanding Bond Enthalpy and Reaction Enthalpy

Bond enthalpy, or bond energy, is the energy required to break a bond in a molecule. To calculate the standard enthalpy change (\(\Delta H^{\circ}\)) for a reaction using bond enthalpies, we consider the energy required to break bonds in the reactants and the energy released when new bonds are formed in the products.

Step 2: Evaluating Each Statement

  • Statement 1: "ΔH° is obtained by adding together the absolute values of the bond energies for all bonds broken and formed."

    • This statement is incorrect. The correct procedure involves subtracting the total bond energies of the products from the total bond energies of the reactants: \(\Delta H = \Sigma BE(\text{bonds broken}) - \Sigma BE(\text{bonds formed})\).

  • Statement 2: "ΔH_{\text{bonds formed}} is always endothermic."

    • This statement is incorrect. The formation of bonds is an exothermic process, meaning it releases energy.

  • Statement 3: "The sum ΔH_{\text{bonds broken}} is given a positive value."

    • This statement is correct. Breaking bonds requires energy, so the enthalpy change for bonds broken is positive.

  • Statement 4: "ΔH for the reaction is given by \(\Sigma BE(\text{reactants}) - \Sigma BE(\text{products})\)."

    • This statement is correct. The enthalpy change for the reaction is calculated by subtracting the total bond energies of the products from the total bond energies of the reactants.

Final Answer

\[ \boxed{\text{The correct statements are: The sum } \Delta H_{\text{bonds broken}} \text{ is given a positive value, and } \Delta H \text{ for the reaction is given by } \Sigma BE(\text{reactants}) - \Sigma BE(\text{products}).} \]

Was this solution helpful?
failed
Unhelpful
failed
Helpful

Questions asked by other users

failedAnswered
Find the equation of the line tangent to the graph of f(x) = (ln x)^2 at x = 8.
failedAnswered
CH3-CH2-NH-C-CH3
failedAnswered
Question 23 of 24 Attempt 7 A college education creates positive externalities. Use the accompanying graph which represents the hypothetical market for college education to answer the questions that follow. MSB stands for marginal social benefit, MPB stands for marginal private benefit, and MPC stands for marginal private cost. 1. Move point E to the efficient equilibrium outcome. 2. If the government wanted to subsidize college education, how much would it subsidize each student to achieve the socially optimal level of education?
failedAnswered
The sample of six measurements shown below was randomly selected from a normally distributed population. Complete parts a through c -2,4,2,3,4,3 a. Test the null hypothesis that the mean of the population is 3 against the alternative hypothesis, μ<3. Use α=0.10. If α=0.10, find the rejection region for the test Choose the correct answer below. A. 1<-1.476 B. t<-1.476 or t>1.476 C. t>2015 D. t>1.476 E. t<-2.015 or t>2.015 F. t<-2.015 Calculate the value of the test statistic. t= (Round to two decimal places as needed.) Make the appropriate conclusion. Choose the correct answer below. A. Do not reject H0. There is insufficient evidence at the α=0.10 level of significance to conclude that the true mean of the population is less than 3 . B. Do not reject H0. There is sufficient evidence at the α=0.10 level of significance to conclude that the true mean of the population is less than 3 C. Reject H0. There is insufficient evidence at the α=0.10 level of significance to conclude that the true mean of the population is less than 3 . D. Reject H0. There is sufficient evidence at the α=0.10 level of significance to conclude that the true mean of the population is less than 3.
failedAnswered
0. State the boiling point of water on the following temperature scales. (a) Fahrenheit (b) Celsius (c) Kelvin