Q: A piece of metal has a cutoff wavelength of $\lambda_c = 450\ \mathrm{nm}$. What is the minimum energy required to remove an electron from the metal surface? (Planck's constant $h = 6.63 \times 10^{-34}\ \mathrm{J\cdot s}$, speed of light $c = 3.00 \times 10^8\ \mathrm{m/s}$)

$4.42 \times 10^{-19}\ \mathrm{J}$

Q: Which of the following is the correct rate law for a reaction that is first order in $\mathrm{A}$ and second order in $\mathrm{B}$?

$\text{rate} = k[\mathrm{A}][\mathrm{B}]^2$

Q: Which of the following is the correct formula for calculating the standard enthalpy change ($\Delta H^\circ$) of a reaction using standard enthalpies of formation?

$\Delta H^\circ = \sum \Delta H_f^\circ (\text{products}) - \sum \Delta H_f^\circ (\text{reactants})$

Question 1

Which of the following molecules has a trigonal planar molecular geometry according to VSEPR theory?

Accepted Answer

$\mathrm{BF_3}$

Question 2

Which of the following best describes the bond angle in a molecule of methane ($\mathrm{CH_4}$)?

Accepted Answer

$109.5^\circ$

Question 3

Which of the following elements has the highest first ionization energy?

Accepted Answer

Fluorine ($\mathrm{F}$)

Question 4

Which of the following is the correct IUPAC name for the molecule shown below?

$\mathrm{CH_3CH_2CH_2CH_2CH_3}$

Accepted Answer

Pentane

Question 5

A piece of metal has a cutoff wavelength of $\lambda_c = 450\ \mathrm{nm}$. What is the minimum energy required to remove an electron from the metal surface? (Planck's constant $h = 6.63 	imes 10^{-34}\ \mathrm{J\cdot s}$, speed of light $c = 3.00 	imes 10^8\ \mathrm{m/s}$)

Accepted Answer

$4.42 	imes 10^{-19}\ \mathrm{J}$

Question 6

Which of the following statements about the combustion of glucose is correct?

$\mathrm{C_6H_{12}O_6 (s) + 6O_2 (g) \rightarrow 6CO_2 (g) + 6H_2O (l)}$

Accepted Answer

The reaction is exothermic and releases heat to the surroundings.

Question 7

Which of the following is the correct rate law for a reaction that is first order in $\mathrm{A}$ and second order in $\mathrm{B}$?

Accepted Answer

$	ext{rate} = k[\mathrm{A}][\mathrm{B}]^2$

Question 8

Which of the following changes will shift the equilibrium to the right for the reaction below?

$\mathrm{N_2 (g) + 3H_2 (g) \rightleftharpoons 2NH_3 (g)}$

Accepted Answer

Removing ammonia ($\mathrm{NH_3}$) as it forms

Question 9

Which of the following is the correct balanced half-reaction for the reduction of permanganate ion ($\mathrm{MnO_4^-}$) to manganese(II) ion ($\mathrm{Mn^{2+}}$) in acidic solution?

Accepted Answer

$\mathrm{MnO_4^-} + 8H^+ + 5e^- \rightarrow Mn^{2+} + 4H_2O$

Question 10

Which of the following best describes the effect of a catalyst on a chemical reaction?

Accepted Answer

It decreases the activation energy.

Question 11

Which of the following is the correct expression for the equilibrium constant $K_c$ for the reaction:

$\mathrm{2NO_2 (g) \rightleftharpoons N_2O_4 (g)}$

Accepted Answer

$K_c = \dfrac{[N_2O_4]}{[NO_2]^2}$

Question 12

Which of the following is the correct cell notation for a galvanic cell with zinc and copper electrodes?

Accepted Answer

$\mathrm{Zn(s) | Zn^{2+}(aq) || Cu^{2+}(aq) | Cu(s)}$

Question 13

Which of the following organic compounds contains a carboxylic acid functional group?

Accepted Answer

$\mathrm{CH_3COOH}$

Question 14

Which of the following is the correct balanced equation for the complete combustion of propane ($\mathrm{C_3H_8}$)?

Accepted Answer

$\mathrm{C_3H_8 + 5O_2 \rightarrow 3CO_2 + 4H_2O}$

Question 15

Which of the following is the correct formula for calculating the standard enthalpy change ($\Delta H^\circ$) of a reaction using standard enthalpies of formation?

Accepted Answer

$\Delta H^\circ = \sum \Delta H_f^\circ (	ext{products}) - \sum \Delta H_f^\circ (	ext{reactants})$

Question 16

Which of the following best describes the effect of increasing temperature on the equilibrium position of an exothermic reaction?

Accepted Answer

The equilibrium shifts to the left, favoring reactant formation.

Question 17

Which of the following is the correct net ionic equation for the reaction between hydrochloric acid and sodium hydroxide?

Accepted Answer

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

Question 18

Which of the following is the correct oxidation number of sulfur in $\mathrm{H_2SO_4}$?

Accepted Answer

$+6$

General Chemistry Final Exam Review: Structure, Properties, Organic Chemistry, Thermochemistry, Equilibrium, and Electrochemistry

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