Question 1

Which of the following molecules has a trigonal pyramidal molecular geometry?

Accepted Answer

NH$$_3$$

Question 2

Which of the following compounds is expected to be most soluble in water?

Accepted Answer

NaNO$$_3$$

Question 3

Given the following reaction: $$2 	ext{NH}_3 (g) + 3 	ext{O}_2 (g) \rightarrow 2 	ext{NO}_2 (g) + 3 	ext{H}_2	ext{O} (g)$$, which element is oxidized?

Accepted Answer

Nitrogen

Question 4

Which of the following substances has the highest boiling point?

Accepted Answer

Kr

Question 5

What is the electron geometry around the central atom in CO$$_2$$?

Accepted Answer

Linear

Question 6

Which of the following is a correct balanced equation for the combustion of cyclopentane (C$$_5H$_{10}$$)?

Accepted Answer

$$C_5H_{10} + 8 O_2$ \rightarrow 5 CO_2$ + 5 H_2O$$

Question 7

Which of the following molecules is nonpolar?

Accepted Answer

SiF$$_4$$

Question 8

Which of the following changes will increase the rate of the reaction $$N_2 (g) + 3$$ $$H_2 (g$$) \rightarrow 2 $$NH_3 (g$$)$$?

Accepted Answer

Increasing the concentration of N$$_2$$

Question 9

Which of the following is the correct equilibrium constant expression for the reaction $$2 SO_2$ (g) + O_2$ (g) \rightleftharpoons 2 SO_3$ (g)$$?

Accepted Answer

$$K = \frac{[SO_3$]^2}{[SO_2$]^2 [O_2$]}$$

Question 10

Which of the following elements has the highest electronegativity?

Accepted Answer

Fluorine

Question 11

If the temperature of a reaction is increased, what happens to the rate constant $$k$$?

Accepted Answer

It increases

Question 12

Which of the following is the oxidizing agent in the reaction $$Zn (s) + 2 HCl (aq) \rightarrow $$ZnCl_2$$ (aq) + H_2$ (g)$$?

Accepted Answer

HCl

Question 13

Which of the following is the correct net ionic equation for the reaction between aqueous solutions of silver nitrate and hydrochloric acid?

Accepted Answer

$$Ag^+ (aq) + Cl^- (aq) \rightarrow AgCl (s)$$

Question 14

Which of the following is the correct order of increasing boiling point for the substances: NH$$_3$$, CH$$_4$$, H$$_2S$$?

Accepted Answer

CH$$_4$$ \u003c H$$_2S$$ \u003c NH$$_3$$

Question 15

Which of the following is a reduction reaction?

Accepted Answer

$$Zn^{2+} + 2e$$^- \rightarrow Zn$$

Question 16

Which of the following compounds contains the greatest number of moles of oxygen in 25.0 g of the compound?

Accepted Answer

Vanadium(V) oxide (V$$_2O$_5)$$

Question 17

Which of the following statements about solubility rules is correct?

Accepted Answer

All nitrates are soluble

Question 18

Which of the following is the correct sign for $$\Delta H$$ for an exothermic reaction?

Accepted Answer

Negative

Question 19

If the equilibrium constant $$K$$ for a reaction is much greater than 1, what does this indicate?

Accepted Answer

The reaction favors the products

Question 20

Which of the following would increase the yield of ammonia in the Haber process ($$N_2 + 3$$ $$H_2$$ \rightleftharpoons 2 $$NH_3) at $$equilibrium?

Accepted Answer

Increasing the pressure

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