Q: Given the following data from a bomb calorimeter experiment: mass of sample = 2.00 g, temperature change of water = $$3.50\ ^\circ C$$, calorimeter heat capacity $$C_{cal} = 6.00\ \mathrm{kJ}/^\circ C. $$What is the total heat released by the reaction?

$$q = 6.00\ \mathrm{kJ}/^\circ C \times 3.50\ ^\circ C = 21.0\ \mathrm{kJ}$$

Question 1

Which of the following best describes the function of the bomb calorimeter shown in the image?

Accepted Answer

It measures the heat evolved or absorbed during a chemical reaction at constant volume.

Question 2

In the bomb calorimeter setup, why is the reaction vessel surrounded by water?

Accepted Answer

To absorb the heat released or absorbed by the reaction, allowing measurement of temperature change.

Question 3

What is the primary reason for using a stirrer in the bomb calorimeter as shown in the image?

Accepted Answer

To ensure uniform temperature distribution in the water surrounding the vessel.

Question 4

Which component in the bomb calorimeter setup is responsible for measuring the temperature change during the reaction?

Accepted Answer

Thermometer

Question 5

Why is the bomb calorimeter considered a constant volume calorimeter?

Accepted Answer

Because the reaction vessel is rigid and does not allow for volume change.

Question 6

If a reaction in the bomb calorimeter causes the water temperature to increase, what can be concluded about the reaction?

Accepted Answer

The reaction is exothermic.

Question 7

Given the following data from a bomb calorimeter experiment: mass of sample = 2.00 g, temperature change of water = $$3.50\ ^\circ C$$, calorimeter heat capacity $$C_{cal} = 6.00\ \mathrm{kJ}/^\circ C. $$What is the total heat released by the reaction?

Accepted Answer

$$q = 6.00\ \mathrm{kJ}/^\circ C 	imes 3.50\ ^\circ C = 21.0\ \mathrm{kJ}$$

Question 8

Which of the following statements about the bomb calorimeter is FALSE?

Accepted Answer

It operates at constant pressure.

Question 9

If the bomb calorimeter is not properly insulated, what error is most likely to occur in the measurement?

Accepted Answer

The measured temperature change will be too low.

Question 10

Why is oxygen supplied to the vessel in a bomb calorimeter experiment?

Accepted Answer

To ensure complete combustion of the sample.

Thermochemistry and Calorimetry: Chapter 7 Study Notes

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