Question 1

Which of the following statements correctly describes the relationship between wavelength and frequency for electromagnetic radiation?

Accepted Answer

As wavelength increases, frequency decreases.

Question 2

A student is given the equation $$E = h 	imes 
u to $$calculate the energy of a photon. If the frequency $$
u of a $$gamma ray is $$6.626 	imes 10$$^{19}$$ Hz, what is the energy of the photon in joules? (h = 6.626$$ 	imes $$10^{-34} J$$·s)

Accepted Answer

$$4.39 	imes 10$$^{-15}$$ J

Question 3

Which quantum number determines the shape of an orbital?

Accepted Answer

Angular momentum quantum number ($$l)$$

Question 4

Which of the following electron configurations violates the Pauli exclusion principle?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^6$$\ $$3s^2$$\ $$3p^6$$\ $$3d^{10}$$\ $$4s^2$$\ $$4p^7$$

Question 5

Which of the following molecules has a polar covalent bond?

Accepted Answer

$$HCl$$

Question 6

Which statement best explains why water ($$H_2O) is a $$liquid at room temperature while methane ($$CH_4) is a $$gas?

Accepted Answer

Water has stronger hydrogen bonding than methane.

Question 7

Which of the following best describes the geometry of $$BF_3$$ according to VSEPR theory?

Accepted Answer

Trigonal planar

Question 8

A sample of gas at 1.0 atm and 273 K occupies 22.4 L. If the pressure is doubled and the temperature is halved, what will be the new volume of the gas? (Use the ideal gas law: $$PV = nRT)$$

Accepted Answer

5.6 L

Question 9

Which of the following is NOT a property of London dispersion forces?

Accepted Answer

They are the strongest type of intermolecular force.

Question 10

Which process is endothermic?

Accepted Answer

Melting ($$s \rightarrow l)$$

Question 11

Which of the following statements about ionic bonding is correct?

Accepted Answer

Ionic bonding involves a complete transfer of electrons from one atom to another.

Question 12

Which of the following molecules will exhibit hydrogen bonding?

Accepted Answer

$$NH_3$$

Question 13

Which law states that the pressure of a gas is inversely proportional to its volume at constant temperature?

Accepted Answer

Boyle's Law

Question 14

Which of the following best describes the effect of increasing intermolecular forces on boiling point?

Accepted Answer

Boiling point increases as intermolecular forces increase.

Question 15

Which of the following is the correct electron configuration for a neutral nitrogen atom?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^3$$

Question 16

Which of the following changes of state involves a decrease in entropy?

Accepted Answer

Condensation ($$g \rightarrow l)$$

Question 17

Which of the following molecules is nonpolar?

Accepted Answer

$$CO_2$$

Question 18

Which of the following statements about resonance structures is correct?

Accepted Answer

Resonance structures have the same arrangement of atoms but different arrangements of electrons.

Question 19

Which of the following best explains why $$N_2 is $$less reactive than $$O_2$$?

Accepted Answer

$$N_2$$ has a triple bond, which is stronger and harder to break than the double bond in $$O_2.$$

Question 20

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

Accepted Answer

$$P_1V_1 = P_2V_2$$

Introduction to Chemistry: Key Concepts and Study Guide

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