Q: Calculate the frequency (in $\mathrm{s^{-1}}$) of blue light with a wavelength of $431\ \mathrm{nm}$.

$6.96 \times 10^{14}\ \mathrm{s^{-1}}$

Q: Which of the following is the correct net ionic equation for the reaction between $\mathrm{MgCl_2(aq)}$ and $\mathrm{Na_2CO_3(aq)}$?

$\mathrm{Mg^{2+}(aq) + CO_3^{2-}(aq) \rightarrow MgCO_3(s)}$

Q: Given the reaction $2\mathrm{NO_2}(g) + \mathrm{O_2}(g) \rightarrow 2\mathrm{NO_3}(g)$ with $\Delta H = -116.2\ \mathrm{kJ}$, what is the sign and magnitude of the enthalpy change for the formation of 1 mole of $\mathrm{NO_3}(g)$?

Sign: negative, Magnitude: $-58.1\ \mathrm{kJ}$

Q: Which of the following is the correct balanced reduction half-reaction for the reduction of $\mathrm{Cr_2O_7^{2-}}$ to $\mathrm{Cr^{3+}}$ in acidic solution?

$\mathrm{Cr_2O_7^{2-} + 14H^+ + 6e^- \rightarrow 2Cr^{3+} + 7H_2O}$

Q: Which of the following best describes the trend in atomic radius across a period in the periodic table?

Atomic radius decreases from left to right across a period.

Q: Which of the following is the correct net ionic equation for the reaction between $\mathrm{NaOH(aq)}$ and $\mathrm{HCl(aq)}$?

$\mathrm{H^+(aq) + OH^-(aq) \rightarrow H_2O(l)}$

Q: Which of the following best describes the effect of a catalyst on the activation energy and rate of a chemical reaction?

A catalyst lowers the activation energy, increasing the reaction rate.

Question 1

Which of the following statements best describes the difference between a molecular substance and an ionic substance at room temperature and 1 atm pressure?

Accepted Answer

Molecular substances are composed of molecules held together by covalent bonds, while ionic substances are composed of ions held together by electrostatic forces.

Question 2

Calculate the molar mass of $\mathrm{Cu_3(PO_4)_2}$ (Copper(II) phosphate). Use the periodic table provided.

Accepted Answer

$380.58\ \mathrm{g/mol}$

Question 3

Which of the following is the correct systematic name for $\mathrm{H_2SO_4}$?

Accepted Answer

Sulfuric acid

Question 4

Determine the empirical formula of a compound that contains 5.07% Be, 10.8% B, 31.1% N, and 53.0% O by mass.

Accepted Answer

$\mathrm{BeBNO_3}$

Question 5

Which of the following ions is present in $\mathrm{NaHCO_3}$ (sodium bicarbonate)?

Accepted Answer

$\mathrm{HCO_3^-}$

Question 6

Calculate the frequency (in $\mathrm{s^{-1}}$) of blue light with a wavelength of $431\ \mathrm{nm}$.

Accepted Answer

$6.96 	imes 10^{14}\ \mathrm{s^{-1}}$

Question 7

Which of the following best describes the oxidation state of manganese in $\mathrm{MnO_4^-}$?

Accepted Answer

$+7$

Question 8

Rank the following elements in order of increasing electronegativity: N, O, Mg, Na.

Accepted Answer

Na < Mg < N < O

Question 9

Which of the following is the correct net ionic equation for the reaction between $\mathrm{MgCl_2(aq)}$ and $\mathrm{Na_2CO_3(aq)}$?

Accepted Answer

$\mathrm{Mg^{2+}(aq) + CO_3^{2-}(aq) \rightarrow MgCO_3(s)}$

Question 10

Given the reaction $2\mathrm{NO_2}(g) + \mathrm{O_2}(g) \rightarrow 2\mathrm{NO_3}(g)$ with $\Delta H = -116.2\ \mathrm{kJ}$, what is the sign and magnitude of the enthalpy change for the formation of 1 mole of $\mathrm{NO_3}(g)$?

Accepted Answer

Sign: negative, Magnitude: $-58.1\ \mathrm{kJ}$

Question 11

Which of the following best describes the mechanism of the rate-determining step in the reaction $\mathrm{C_6H_{12} + Br_2 \rightarrow C_6H_{11}Br + HBr}$ if the step involves the formation of a carbocation intermediate?

Accepted Answer

Electrophilic

Question 12

Which of the following is the correct formula for chromic acid?

Accepted Answer

$\mathrm{H_2CrO_4}$

Question 13

A solution contains $0.35\ \mathrm{M}$ HBr. Calculate the pH. ($K_w = 1.0 	imes 10^{-14}$ at 25°C)

Accepted Answer

$0.46$

Question 14

Which of the following is the correct balanced reduction half-reaction for the reduction of $\mathrm{Cr_2O_7^{2-}}$ to $\mathrm{Cr^{3+}}$ in acidic solution?

Accepted Answer

$\mathrm{Cr_2O_7^{2-} + 14H^+ + 6e^- \rightarrow 2Cr^{3+} + 7H_2O}$

Question 15

Which of the following best describes the trend in atomic radius across a period in the periodic table?

Accepted Answer

Atomic radius decreases from left to right across a period.

Question 16

Which of the following is the correct net ionic equation for the reaction between $\mathrm{NaOH(aq)}$ and $\mathrm{HCl(aq)}$?

Accepted Answer

$\mathrm{H^+(aq) + OH^-(aq) \rightarrow H_2O(l)}$

Question 17

Which of the following is the correct formula for the conjugate base of $\mathrm{H_2PO_4^-}$?

Accepted Answer

$\mathrm{HPO_4^{2-}}$

Question 18

Which of the following best describes the effect of a catalyst on the activation energy and rate of a chemical reaction?

Accepted Answer

A catalyst lowers the activation energy, increasing the reaction rate.

General Chemistry Final Exam Study Guide

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