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}$$}$$

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 \u003c Mg \u003c N \u003c 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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