Question 1

Which of the following statements best describes the process of oxidation in a chemical reaction?

Accepted Answer

Oxidation is the loss of electrons by an atom or ion.

Question 2

A solution is prepared by dissolving 0.50 mol of NaCl in enough water to make 1.0 L of solution. What is the molarity of the solution?

Accepted Answer

$$0.50\ \mathrm{M}$$

Question 3

Which of the following best explains why the volume of a gas increases when the temperature increases at constant pressure (Charles's Law)?

Accepted Answer

Gas molecules move faster, colliding with the walls more frequently and with greater force, causing the volume to expand.

Question 4

A student mixes 50.0 mL of 0.200 M NaOH with 25.0 mL of 0.100 M HCl. What is the concentration of NaOH remaining after the reaction is complete?

Accepted Answer

$$0.133\ \mathrm{M}$$

Question 5

Which equation correctly relates the pressure, volume, and temperature of a gas when all three variables are changing?

Accepted Answer

$$\dfrac{P_1$ V_1$}{T_1$} = \dfrac{P_2$ V_2$}{T_2$}$$

Question 6

A 2.00 g sample of a metal is heated from 20.0°C to 30.0°C, absorbing 8.00 J of heat. What is the specific heat capacity of the metal?

Accepted Answer

$$0.40\ \mathrm{J\ g$$^{-1}$$\ ^\circ C$$^{-1}$$}$$

Question 7

Which of the following best describes the difference between heat and temperature?

Accepted Answer

Heat is the energy transferred due to a temperature difference, while temperature is a measure of the average kinetic energy of particles.

Question 8

Which of the following is the correct expression for the energy of a photon?

Accepted Answer

$$E = h 
u$$

Question 9

A gas sample at 1.00 atm and 273 K occupies 22.4 L. If the pressure is increased to 2.00 atm at constant temperature, what is the new volume?

Accepted Answer

$$11.2\ \mathrm{L}$$

Question 10

Which of the following statements about the Boltzmann distribution of molecular velocities is correct?

Accepted Answer

The distribution shows that most molecules move at the average speed, with fewer at very high or very low speeds.

Question 11

Which of the following is the correct formula for calculating the root mean square speed ($$u_{rms}) of a $$gas molecule?

Accepted Answer

$$u_{rms} = \sqrt{\dfrac{3RT}{M}}$$

Question 12

Which of the following best explains why elements in the same group of the periodic table have similar chemical properties?

Accepted Answer

They have the same number of valence electrons.

Question 13

Which of the following is the correct relationship for Boyle's Law?

Accepted Answer

$$P_1$$ $$V_1$$ = $$P_2$$ $$V_2$$

Question 14

A reaction has $$\Delta H = -572\ \mathrm{kJ}$$ and $$\Delta S = 2.0\ \mathrm{kJ\ K$$^{-1}$$} at 298 K. $$What is the value of $$\Delta G$$?

Accepted Answer

$$-1,168\ \mathrm{J}$$

Question 15

Which of the following is a correct statement about the photoelectric effect?

Accepted Answer

Electrons are emitted only if the frequency of the incident light is above a certain threshold, regardless of intensity.

Question 16

Which of the following is the correct formula for calculating the energy change in a reaction at constant pressure?

Accepted Answer

$$\Delta H = q_p$$

Question 17

Which quantum number determines the shape of an atomic orbital?

Accepted Answer

Angular momentum quantum number ($$l)$$

Question 18

A sample of gas is collected over water at 25°C. The total pressure is 760 mmHg, and the vapor pressure of water at 25°C is 24 mmHg. What is the pressure of the dry gas?

Accepted Answer

$$736\ \mathrm{mmHg}$$

Question 19

Which of the following best describes the concept of a node in an atomic orbital?

Accepted Answer

A region where the probability of finding an electron is zero.

Exam 2 Things to Know

Study Guide - Practice Questions

Study Guide - Flashcards