Question 1

Which of the following best describes a redox reaction?

Accepted Answer

A reaction in which electrons are transferred between species.

Question 2

Given the reaction: $$2Fe^{3+} + 2I$$^- \rightarrow $$2Fe^{2+}$$ + $$I_2$$, which species is oxidized?

Accepted Answer

I$$^-$$

Question 3

Which of the following is NOT a state function?

Accepted Answer

Work ($$w)$$

Question 4

A gas sample occupies 2.0 L at 1.0 atm and 300 K. What will be its volume at 2.0 atm and 300 K? (Assume ideal gas behavior)

Accepted Answer

1.0 L

Question 5

Which law relates the pressure and volume of a gas at constant temperature?

Accepted Answer

Boyle's Law: $$P_1V_1 = P_2V_2$$

Question 6

Which of the following statements about the First Law of Thermodynamics is correct?

Accepted Answer

The total energy of the universe is constant.

Question 7

A chemical reaction releases 150 J of heat and does 50 J of work on the surroundings. What is the change in internal energy ($$\Delta E$$)?

Accepted Answer

$$\Delta E = 100 J$$

Question 8

Which equation is used to calculate the heat absorbed by a substance when its temperature changes?

Accepted Answer

$$q = m c \Delta T$$

Question 9

A 50.0 g sample of water is heated from 25.0°C to 75.0°C. If the specific heat of water is $$4.18 \frac{J}{g \cdot ^\circ C}$$, how much heat is absorbed?

Accepted Answer

10,450 J

Question 10

Which of the following is true about exothermic reactions?

Accepted Answer

They release heat to the surroundings.

Question 11

Dalton’s Law of Partial Pressures states:

Accepted Answer

The total pressure of a mixture of gases is the sum of the partial pressures of each gas.

Question 12

Which equation is used to relate the pressure, volume, temperature, and number of moles of an ideal gas?

Accepted Answer

$$PV = nRT$$

Question 13

A mixture contains 2.0 mol of O$$_2$$ and 3.0 mol of N$$_2 at a $$total pressure of 5.0 atm. What is the partial pressure of O$$_2$$?

Accepted Answer

2.0 atm

Question 14

Which of the following best describes Graham’s Law of Effusion?

Accepted Answer

The rate of effusion of a gas is inversely proportional to the square root of its molar mass.

Question 15

Which of the following is a correct application of Hess’s Law?

Accepted Answer

The enthalpy change of a reaction is the sum of the enthalpy changes of the steps into which the reaction can be divided.

Question 16

Which of the following is NOT a correct statement about the kinetic molecular theory of gases?

Accepted Answer

Gas particles experience attractive and repulsive forces.

Question 17

Which of the following is the correct formula for calculating the molar mass of a gas using Graham’s Law?

Accepted Answer

$$\frac{$$Rate_1$$}{$$Rate_2$$} = \sqrt{\frac{M_2$}{M_1$}}$$

Question 18

Which of the following is a correct statement about enthalpy ($$\Delta H) in $$chemical reactions?

Accepted Answer

Endothermic reactions absorb heat and have a positive $$\Delta H.$$

Question 19

A balloon expands against a constant external pressure of 1.0 atm, doing 50 J of work. What is the sign of the work?

Accepted Answer

Negative, because the system does work on the surroundings.

General Chemistry Exam Study Guide: Gases, Thermodynamics, and Calorimetry

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