Question 1

Which of the following compounds is a strong electrolyte when dissolved in water?

Accepted Answer

Sodium chloride ($\mathrm{NaCl}$)

Question 2

A solution is prepared by dissolving $0.50$ mol of $\mathrm{Na_2SO_4}$ in enough water to make $1.0$ L of solution. What is the concentration of $\mathrm{SO_4^{2-}}$ ions in the solution?

Accepted Answer

$0.50$ M

Question 3

Which of the following best describes a precipitation reaction?

Accepted Answer

A reaction in which a solid forms from the mixing of two aqueous solutions.

Question 4

Which of the following ionic compounds is insoluble in water according to the solubility rules?

Accepted Answer

$\mathrm{AgCl}$

Question 5

What is the net ionic equation for the reaction between $\mathrm{Na_2SO_4}$ and $\mathrm{BaCl_2}$ in aqueous solution?

Accepted Answer

$\mathrm{Ba^{2+} (aq) + SO_4^{2-} (aq) \rightarrow BaSO_4 (s)}$

Question 6

Which of the following is a weak acid?

Accepted Answer

Acetic acid ($\mathrm{CH_3COOH}$)

Question 7

A $25.0$ mL sample of $0.200$ M $\mathrm{HCl}$ is titrated with $0.100$ M $\mathrm{NaOH}$. What volume of $\mathrm{NaOH}$ is required to reach the equivalence point?

Accepted Answer

$50.0$ mL

Question 8

Which of the following statements about oxidation and reduction is correct?

Accepted Answer

Oxidation is the loss of electrons; reduction is the gain of electrons.

Question 9

What is the oxidation number of sulfur in $\mathrm{SO_4^{2-}}$?

Accepted Answer

$+6$

Question 10

A solution is made by diluting $50.0$ mL of $2.00$ M $\mathrm{NaOH}$ to a final volume of $200.0$ mL. What is the final concentration?

Accepted Answer

$0.25$ M

Question 11

Which of the following is the correct formula for calculating the energy of a photon?

Accepted Answer

$E = h 
u$

Question 12

What is the wavelength (in nm) of light with a frequency of $6.0 	imes 10^{14}$ Hz? ($c = 3.0 	imes 10^8$ m/s)

Accepted Answer

$500$ nm

Question 13

Which quantum number defines the shape of an atomic orbital?

Accepted Answer

Angular momentum quantum number ($l$)

Question 14

How many electrons can occupy a $3p$ subshell?

Accepted Answer

$6$

Question 15

Which of the following elements has the electron configuration $[Ne] 3s^2 3p^1$?

Accepted Answer

Aluminum ($\mathrm{Al}$)

Question 16

Which statement about the first law of thermodynamics is correct?

Accepted Answer

The total energy of the universe is constant.

Question 17

A $100.0$ g sample of water ($C = 4.18$ J/g$\cdot$°C) absorbs $836$ J of heat. What is the temperature change ($\Delta T$)?

Accepted Answer

$2.0$ °C

Question 18

Which of the following processes is exothermic?

Accepted Answer

Combustion of methane

Question 19

Given the enthalpies of formation: $\Delta H_f^\circ (\mathrm{CO_2}) = -393.5$ kJ/mol, $\Delta H_f^\circ (\mathrm{H_2O}) = -285.8$ kJ/mol, $\Delta H_f^\circ (\mathrm{CH_4}) = -74.8$ kJ/mol, calculate $\Delta H_{rxn}$ for the combustion of methane: $\mathrm{CH_4 (g) + 2 O_2 (g) \rightarrow CO_2 (g) + 2 H_2O (l)}$.

Accepted Answer

$-890.3$ kJ

Question 20

Which of the following is a state function?

Accepted Answer

Enthalpy ($H$)

General Chemistry Study Guide: Chapters 4, 5, and 6 (Aqueous Reactions, Thermochemistry, Electronic Structure)

Study Guide - Practice Questions

Study Guide - Flashcards