Q: Which of the following best describes Avogadro’s number?

The number of particles in one mole of a substance, $6.022 \times 10^{23}$

Question 1

Which of the following statements best describes a chemical compound?

Accepted Answer

A substance composed of two or more elements chemically combined in fixed proportions.

Question 2

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

Accepted Answer

$1s^2\ 2s^2\ 2p^4$

Question 3

A sample contains 0.50 mol of NaCl. How many formula units of NaCl are present in the sample?

Accepted Answer

$3.01 	imes 10^{23}$

Question 4

Which of the following best explains why ionic compounds tend to have high melting points?

Accepted Answer

Strong electrostatic forces between oppositely charged ions require a large amount of energy to break.

Question 5

Which of the following is the correct empirical formula for glucose ($C_6H_{12}O_6$)?

Accepted Answer

$CH_2O$

Question 6

A solution is prepared by dissolving 5.00 g of NaOH in enough water to make 250.0 mL of solution. What is the molarity of the solution? ($M_{NaOH} = 40.00\ g/mol$)

Accepted Answer

$0.500\ M$

Question 7

Which of the following reactions is a precipitation reaction?

Accepted Answer

$AgNO_3(aq) + NaCl(aq) \rightarrow AgCl(s) + NaNO_3(aq)$

Question 8

Which quantum number determines the shape of an atomic orbital?

Accepted Answer

The azimuthal (angular momentum) quantum number $l$

Question 9

A chemical reaction is carried out with 10.0 g of $Al$ and 19.0 g of $Cl_2$ according to the equation: $2Al + 3Cl_2 \rightarrow 2AlCl_3$. Which reactant is the limiting reactant?

Accepted Answer

$Cl_2$

Question 10

Which of the following best describes the difference between a molecular compound and an ionic compound?

Accepted Answer

A molecular compound consists of atoms held together by covalent bonds, while an ionic compound consists of ions held together by electrostatic forces.

Question 11

Which of the following is the correct name for $Fe_2O_3$?

Accepted Answer

Iron(III) oxide

Question 12

Which of the following best describes Avogadro’s number?

Accepted Answer

The number of particles in one mole of a substance, $6.022 	imes 10^{23}$

Question 13

Which of the following is a correct statement about acids and bases in aqueous solution?

Accepted Answer

Acids produce $H^+$ ions and bases produce $OH^-$ ions in aqueous solution.

Question 14

Which of the following is the correct formula weight for $Ca(NO_3)_2$? ($Ca = 40.08\ g/mol$, $N = 14.01\ g/mol$, $O = 16.00\ g/mol$)

Accepted Answer

$164.10\ g/mol$

Question 15

Which of the following best describes the Bohr model of the atom?

Accepted Answer

Electrons orbit the nucleus in fixed energy levels without radiating energy.

Question 16

A student mixes 50.0 mL of 0.200 M $HCl$ with 50.0 mL of 0.200 M $NaOH$. What is the final concentration of $NaCl$ in the resulting solution?

Accepted Answer

$0.100\ M$

Question 17

Which of the following best explains the line spectra observed for hydrogen?

Accepted Answer

Electrons transition between quantized energy levels, emitting photons of specific energies.

Question 18

Which of the following is the correct name for $K_2SO_4$?

Accepted Answer

Potassium sulfate

Question 19

Which of the following best describes the wave-particle duality of light?

Accepted Answer

Light exhibits both wave-like and particle-like properties depending on the experiment.

Question 20

A solution contains $0.10\ mol$ of $Na_2SO_4$ in $500\ mL$ of water. What is the concentration of $SO_4^{2-}$ ions in the solution?

Accepted Answer

$0.20\ M$

General Chemistry I: Chapter and Topic Overview

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