Question 1

Which of the following best describes the relationship between the heat released by a chemical reaction and the heat gained by the surroundings in a coffee cup calorimeter experiment?

Accepted Answer

The heat released by the reaction is equal to the heat gained by the surroundings.

Question 2

In bomb calorimetry, which equation correctly relates the change in internal energy ($$\Delta U) to $$the heat ($$q) $$and work ($$w) $$done by the system?

Accepted Answer

$$\Delta U = q + w$$

Question 3

Which of the following statements about phase transitions is correct?

Accepted Answer

Phase transitions require energy to be added or removed from the system.

Question 4

A sample of water is heated from ice at $$-10^\circC to $$steam at $$110^\circC. At $$which points does the temperature remain constant despite heat being added?

Accepted Answer

During melting and boiling.

Question 5

Which of the following is the correct enthalpy change for the vaporization of water at $$100^\circC$$?

Accepted Answer

$$\Delta H_{vap} = 40.7\ \mathrm{kJ/mol}$$

Question 6

Which of the following best explains why the boiling point of water increases in a pressure cooker?

Accepted Answer

The increased pressure raises the vapor pressure required for boiling.

Question 7

Which of the following is NOT a function of food as described in calorimetry studies?

Accepted Answer

Supplying oxygen for cellular respiration.

Question 8

Given the combustion reaction for glucose: $$\mathrm{C_6H_{12}O_6$(s) + 6O_2(g) \rightarrow 6CO_2(g) + 6H_2O(l)}$$ with $$\Delta H_f^\circ = -2803\ \mathrm{kJ}$$, what does the negative sign indicate?

Accepted Answer

Energy is released to the surroundings.

Question 9

Which of the following statements about allotropes is correct?

Accepted Answer

Allotropes are different forms of an element in the same physical state.

Question 10

Which of the following is the reference form of carbon?

Accepted Answer

Graphite

Question 11

If the heat capacity of water in a calorimeter is $$4.18\ \mathrm{J/g\cdot K}$$ and the temperature increases by $$2.5\ \mathrm{K}$$ for $$100\ \mathrm{g} of $$water, what is the heat gained by the water?

Accepted Answer

$$1045\ \mathrm{J}$$

Question 12

Which of the following best describes dynamic equilibrium in the context of vapor pressure?

Accepted Answer

Evaporation and condensation occur at equal rates.

Question 13

Which of the following is true regarding the effect of altitude on the boiling point of water?

Accepted Answer

Boiling point decreases at higher altitudes.

Question 14

Which of the following is the correct formula for calculating the enthalpy change at constant pressure?

Accepted Answer

$$\Delta H = \Delta U + P\Delta V$$

Question 15

Which fossil fuel is considered the cleanest and most convenient for electricity production in Canada, according to the lecture?

Accepted Answer

Natural gas

Question 16

If $$1\ \mathrm{g} of $$fat provides $$9.0\ \mathrm{kcal}$$ and $$1\ \mathrm{g} of $$carbohydrate provides $$4.0\ \mathrm{kcal}$$, how much energy is provided by a meal containing $$20\ \mathrm{g} of $$fat and $$50\ \mathrm{g} of $$carbohydrate?

Accepted Answer

$$(20 	imes 9.0) + (50 	imes 4.0) = 180 + 200 = 380\ \mathrm{kcal}$$

Question 17

Which of the following transitions is called sublimation?

Accepted Answer

Solid to gas

Question 18

Which of the following is a correct statement about the vapor pressure of a liquid?

Accepted Answer

Vapor pressure increases as temperature increases.

Question 19

Which of the following is NOT a topic covered in the summary of the lecture?

Accepted Answer

Electrochemistry and redox reactions

Thermochemistry, Calorimetry, and Phase Transitions

Guida di studio - Domande di pratica

Study guide - Flashcard