Question 1

Which of the following best describes the electron geometry and molecular geometry of the carbonate ion, $$\mathrm{CO_3$^{2-}}$$?

Accepted Answer

Electron geometry: trigonal planar; Molecular geometry: trigonal planar

Question 2

How many resonance structures must be drawn for the phosphate ion, $$\mathrm{PO_4$^{3-}}$$, that satisfy the octet rule?

Accepted Answer

4

Question 3

What is the AXE classification for $$\mathrm{SO_2$}$$?

Accepted Answer

AX_2E_1

Question 4

A carbon atom in a molecule is double-bonded to an oxygen atom and single-bonded to two other atoms. What is the molecular geometry around this carbon atom?

Accepted Answer

Trigonal planar

Question 5

Which of the following best describes the molecular geometry of $$\mathrm{CO_2$}$$?

Accepted Answer

Linear

Question 6

Which of the following correctly shows the direction of bond polarity for Si–N, O–P, and Br–C bonds? (Arrow points toward the more electronegative atom.)

Accepted Answer

Si $$\rightarrow N$$, O $$\rightarrow P$$, Br $$\leftarrow C$$

Question 7

Classify the following as polar or nonpolar: $$\mathrm{PF_3$}$$, $$\mathrm{$$CCl_4$$}$$, $$\mathrm{CH_2O}.$$

Accepted Answer

polar, nonpolar, polar

Question 8

Which of the following substances exhibits hydrogen bonding as its strongest intermolecular force?

Accepted Answer

$$\mathrm{CH_3CH_2OH}$$

Question 9

Rank the following compounds in order of increasing boiling point: (1) $$\mathrm{CH_3CH_2CH_2CH_3}$$, (2) $$\mathrm{CH_3CH_2CH(CH_3$)_2}$$, (3) $$\mathrm{(CH_3$)_4C}.$$

Accepted Answer

3 \u003c 2 \u003c 1

Question 10

Balance the following equation using the lowest possible whole number coefficients: $$\mathrm{CH_3NH_2 (g) + O_2$ (g) \rightarrow CO_2$ (g) + H_2O (g) + N_2$ (g)}. $$What is the coefficient for $$\mathrm{O_2$}$$?

Accepted Answer

7

Question 11

When solutions of silver nitrate and potassium chromate are mixed, which precipitate forms?

Accepted Answer

$$\mathrm{Ag_2CrO_4}$$

Question 12

Which of the following mixtures will produce a precipitate when the solutions are mixed? (1) $$\mathrm{Ni(NO_3$)_2} (aq$$) + $$\mathrm{Na_2CO_3} (aq$$), (2) $$\mathrm{$$BaCl_2$$} (aq$$) + $$\mathrm{$$CuSO_4$$} (aq$$), (3) $$\mathrm{K_3PO_4} (aq$$) + $$\mathrm{Ni(C_2H_3O_2)_2} (aq)$$

Accepted Answer

precipitate, precipitate, no reaction

Question 13

What is the coefficient in front of $$\mathrm{H_2O}$$ when the neutralization reaction between barium hydroxide and sulfuric acid is balanced with the smallest possible whole number coefficients?

Accepted Answer

2

Question 14

In the reaction $$\mathrm{$$KClO_3$$ (aq) + 6 HBr (aq) \rightarrow 3 Br_2$ (l) + 3 H_2O (l) + KCl (aq)}$$, which element is oxidized?

Accepted Answer

Bromine

Question 15

How many moles of iron(III) oxide are present in 50.00 g of iron(III) oxide ($$\mathrm{Fe_2O_3}$$)? (Molar mass = 159.7 g/mol)

Accepted Answer

0.3131 mol

Question 16

For the reaction $$\mathrm{B_2O_3 (s) + 3 $$CaF_2$$ (s) \rightarrow 2 BF_3$ (g) + 3 CaO (s)}$$, how many moles of boron trifluoride are produced when 0.750 mole of calcium fluoride reacts with excess $$\mathrm{B_2O_3}$$?

Accepted Answer

0.500 mol

Question 17

Given the reaction $$\mathrm{O_2$ (g) + 2 H_2$ (g) \rightarrow 2 H_2O (g)}$$, if you start with 7 molecules of $$\mathrm{O_2$}$$ and 14 molecules of $$\mathrm{H_2$}$$, what is the limiting reactant and how many molecules of $$\mathrm{H_2O}$$ can be formed?

Accepted Answer

$$\mathrm{O_2$} is $$the limiting reactant and 14 molecules of $$\mathrm{H_2O}$$ can be made.

Question 18

Classify the following reactions as exothermic or endothermic:
(i) $$\mathrm{3 H_2$ (g) + N_2$ (g) \rightarrow 2 NH_3$ (g)}$$ $$\Delta H = -21.9$$ kcal
(ii) $$\mathrm{2 H_2O_2 (aq) \rightarrow 2 H_2O (l) + O_2$ (g)}$$ $$\Delta H = -46.9$$ kcal
(iii) $$\mathrm{$$MgCO_3$$ (s) + 28.04~kcal \rightarrow MgO (s) + CO_2$ (g)}$$

Accepted Answer

exothermic, exothermic, endothermic

Question 19

According to the reaction energy diagram, if the reactants start at 25 kcal and the peak is at 175 kcal, what is the activation energy ($$E_a) $$for the forward reaction?

Accepted Answer

150.0 kcal

General Chemistry II: Molecular Structure, Bonding, Reactions, and Stoichiometry – Study Guide

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