Question 1

A chemist needs to prepare 250 mL of a 0.500 M NaCl solution from a stock solution of 2.00 M NaCl. What volume of the stock solution should be used?

Accepted Answer

$62.5\ \mathrm{mL}$

Question 2

Which of the following best explains why the atomic radius decreases across a period from left to right?

Accepted Answer

The effective nuclear charge increases, pulling electrons closer to the nucleus.

Question 3

A sample of gas occupies $4.00\ \mathrm{L}$ at $1.00\ \mathrm{atm}$ and $300\ \mathrm{K}$. If the volume is doubled and the temperature is increased to $600\ \mathrm{K}$, what is the new pressure?

Accepted Answer

$1.00\ \mathrm{atm}$

Question 4

Which of the following compounds has the highest lattice energy?

Accepted Answer

$\mathrm{LiF}$

Question 5

Which of the following is a pure substance?

Accepted Answer

Elemental copper

Question 6

A flask contains $0.250\ \mathrm{mol}$ of liquid bromine. How many bromine molecules are in the flask?

Accepted Answer

$1.51 	imes 10^{24}$

Question 7

Which of the following statements about subatomic particles is true?

Accepted Answer

Protons and neutrons are found in the nucleus of an atom.

Question 8

What is the empirical formula of a compound that contains $40.0\%$ carbon, $6.7\%$ hydrogen, and $53.3\%$ oxygen by mass?

Accepted Answer

$\mathrm{CH}_2\mathrm{O}$

Question 9

Which of the following atoms has the largest atomic radius?

Accepted Answer

$\mathrm{Cs}$

Question 10

Which of the following is the correct electron configuration for $\mathrm{Mg}$?

Accepted Answer

$1s^2\ 2s^2\ 2p^6\ 3s^2$

Question 11

A $2.00\ \mathrm{L}$ balloon is filled with a gas at $5.0\ \mathrm{atm}$. If the pressure is reduced to $0.50\ \mathrm{atm}$ without a change in temperature, what will the volume of the balloon be?

Accepted Answer

$20.0\ \mathrm{L}$

Question 12

Which of the following best describes the trend in ionization energy across a period?

Accepted Answer

It increases due to increasing effective nuclear charge.

Question 13

Which of the following molecules is polar?

Accepted Answer

$\mathrm{NH}_3$

Question 14

What is the wavelength (in nm) of light that has a frequency of $3.22 	imes 10^{15}\ \mathrm{s}^{-1}$? (Speed of light $c = 3.00 	imes 10^8\ \mathrm{m/s}$)

Accepted Answer

$93.2$

Question 15

Which of the following statements about the kinetic molecular theory is correct?

Accepted Answer

Gas particles move in random, straight-line motion.

Question 16

Which of the following is the correct Lewis structure for $\mathrm{CO}_2$?

Accepted Answer

O=C=O, with each O atom having two lone pairs

Question 17

Which of the following solutions has the highest boiling point?

Accepted Answer

$0.10\ \mathrm{M}\ \mathrm{NaCl}$

Question 18

Which of the following is the correct set of quantum numbers for a $3p$ electron?

Accepted Answer

$n=3,\ l=1,\ m_l=0,\ m_s=+\frac{1}{2}$

Question 19

Which of the following best describes the intermolecular forces present in liquid water?

Accepted Answer

Hydrogen bonding, dipole-dipole, and London dispersion forces

Question 20

Which of the following is the correct balanced equation for the reaction of hydrochloric acid with barium hydroxide?

Accepted Answer

$2\ \mathrm{HCl}\ (aq) + \mathrm{Ba(OH)}_2\ (aq) \rightarrow \mathrm{BaCl}_2\ (aq) + 2\ \mathrm{H}_2\mathrm{O}\ (l)$

General Chemistry Practice Final Exam Study Guide

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