Questions: Module OI Homework Question 18 of 18 (1 point) Question Attempt 1 of Unlimited Experiments were done on a certain pure substance X to determine some of its properties. There's a description of each experiment in the table below. In each case, decide whether the property measured was a chemical or physical property of X, if you can. If you don't have enough information to decide, choose can't decide in the third column. property experiment physical or chemical? P A small sample of X is dissolved in water. Drops of another solution, containing dissolved sodium hydroxide, are slowly added, and a pH indicator is used to determine when the sodium hydroxide has completely reacted with X. From the amount of sodium hydroxide needed, the value of P may be calculated. physical chemical (can't decide) D A sample of X is carefully weighed and put inside a vented flask. Water is added to the flask until it just covers the sample, and the volume of sample and water is recorded. Then the sample is removed and the volume of water alone recorded. From the mass of the sample and the difference in volumes, the value of D may be calculated. physical chemical (can't decide) C A sample of X is carefully weighed and put inside a sealed calorimeter. Pure oxygen gas is injected into the calorimeter, and the mixture ignited. After all of X has reacted with the oxygen gas, the temperature rise of the calorimeter is measured. From this change in temperature the value of C may be calculated. physical chemical (can't decide)

Module OI Homework Question 18 of 18 (1 point) Question Attempt 1 of Unlimited Experiments were done on a certain pure substance X to determine some of its properties. There's a description of each experiment in the table below. In each case, decide whether the property measured was a chemical or physical property of X, if you can. If you don't have enough information to decide, choose can't decide in the third column. property experiment physical or chemical? P A small sample of X is dissolved in water. Drops of another solution, containing dissolved sodium hydroxide, are slowly added, and a pH indicator is used to determine when the sodium hydroxide has completely reacted with X. From the amount of sodium hydroxide needed, the value of P may be calculated. physical chemical (can't decide) D A sample of X is carefully weighed and put inside a vented flask. Water is added to the flask until it just covers the sample, and the volume of sample and water is recorded. Then the sample is removed and the volume of water alone recorded. From the mass of the sample and the difference in volumes, the value of D may be calculated. physical chemical (can't decide) C A sample of X is carefully weighed and put inside a sealed calorimeter. Pure oxygen gas is injected into the calorimeter, and the mixture ignited. After all of X has reacted with the oxygen gas, the temperature rise of the calorimeter is measured. From this change in temperature the value of C may be calculated. physical chemical (can't decide)
Transcript text: Module OI Homework Question 18 of 18 (1 point) | Question Attempt 1 of Unlimited Experiments were done on a certain pure substance $X$ to determine some of its properties. There's a description of each experiment in the table below. In each case, decide whether the property measured was a chemical or physical property of $X$, if you can. If you don't have enough information to decide, choose can't decide in the third column. \begin{tabular}{|c|c|c|} \hline property & experiment & physical or chemical? \\ \hline P & A small sample of $X$ is dissolved in water. Drops of another solution, containing dissolved sodium hydroxide, are slowly added, and a pH indicator is used to determine when the sodium hydroxide has completely reacted with $X$. From the amount of sodium hydroxide needed, the value of $P$ may be calculated. & physical chemical (can't decide) \\ \hline D & A sample of $X$ is carefully weighed and put inside a vented flask. Water is added to the flask until it just covers the sample, and the volume of sample and water is recorded. Then the sample is removed and the volume of water alone recorded. From the mass of the sample and the difference in volumes, the value of $D$ may be calculated. & physical chemical (can't decide) \\ \hline C & A sample of $X$ is carefully weighed and put inside a sealed calorimeter. Pure oxygen gas is injected into the calorimeter, and the mixture ignited. After all of $X$ has reacted with the oxygen gas, the temperature rise of the calorimeter is measured. From this change in temperature the value of $C$ may be calculated. & physical chemical (can't decide) \\ \hline \end{tabular}
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Solution

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Solution Steps

Step 1: Determine the Property for Experiment P
  • In experiment P, a sample of substance $X$ is dissolved in water and reacts with sodium hydroxide. The reaction is monitored using a pH indicator.
  • Since this involves a chemical reaction (neutralization) to determine the property, it is a chemical property.
Step 2: Determine the Property for Experiment D
  • In experiment D, the mass and volume of substance $X$ are measured by adding water and recording the volume displacement.
  • This process involves measuring physical quantities (mass and volume) without changing the chemical identity of $X$.
  • Therefore, this is a physical property.
Step 3: Determine the Property for Experiment C
  • In experiment C, substance $X$ is reacted with oxygen in a calorimeter, and the temperature change is measured.
  • This involves a chemical reaction (combustion) to determine the property.
  • Hence, this is a chemical property.

Final Answer

  • For property P: \(\boxed{\text{chemical}}\)
  • For property D: \(\boxed{\text{physical}}\)
  • For property C: \(\boxed{\text{chemical}}\)
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