Question 1

A sample contains 12.0 g of carbon, 2.0 g of hydrogen, and 32.0 g of oxygen. What is the empirical formula of the compound?

Accepted Answer

CH\_2O

Question 2

Which of the following is a polyatomic ion?

Accepted Answer

SO\_4\^{2-}

Question 3

A compound has a molar mass of 180 g/mol and an empirical formula of CH\_2O. What is its molecular formula?

Accepted Answer

C\_6H\_12O\_6

Question 4

Which of the following best describes the geometry and bond angle of a molecule with 4 electron domains and no lone pairs on the central atom?

Accepted Answer

Tetrahedral, 109.5\degree

Question 5

Which of the following molecules is polar?

Accepted Answer

NH\_3

Question 6

What is the oxidation state of sulfur in H\_2SO\_4?

Accepted Answer

+6

Question 7

Which of the following is a strong acid?

Accepted Answer

HNO\_3

Question 8

A solution is prepared by diluting 50.0 mL of 6.0 M HCl to a final volume of 300.0 mL. What is the final concentration?

Accepted Answer

1.0 M

Question 9

Which of the following best describes a double displacement reaction?

Accepted Answer

AgNO\_3 + NaCl \rightarrow AgCl + NaNO\_3

Question 10

Which of the following is the correct net ionic equation for the reaction between Na\_2SO\_4(aq) and BaCl\_2(aq)?

Accepted Answer

$$\mathrm{Ba$$^{2+}$$(aq) + SO_4$^{2-}(aq) \rightarrow $$BaSO_4$$(s)}$$

Question 11

Which of the following statements about sigma ($$\sigma) $$and pi ($$\pi) $$bonds is correct?

Accepted Answer

A double bond consists of one sigma and one pi bond.

Question 12

What is the percent composition by mass of oxygen in H\_2O?

Accepted Answer

88.8\%

Question 13

Which of the following is the correct formula for calcium hydroxide?

Accepted Answer

Ca(OH)\_2

Question 14

Which of the following is a transition metal?

Accepted Answer

Fe

Question 15

Which of the following molecules has a bent molecular geometry?

Accepted Answer

H\_2O

Question 16

Which of the following is the correct balanced equation for the combustion of methane?

Accepted Answer

$$\mathrm{CH_4$ + 2O_2 \rightarrow CO_2$ + 2H_2O}$$

Question 17

Which of the following is a strong electrolyte?

Accepted Answer

NaCl (aq)

Question 18

Which of the following is the correct formula for the nitrate ion?

Accepted Answer

NO\_3\^-

Question 19

Which of the following is the correct expression for dilution calculations?

Accepted Answer

$$M_1V_1 = M_2V_2$$

Question 20

Which of the following is the correct net ionic equation for the neutralization of HCl with NaOH?

Accepted Answer

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

General Chemistry II Midterm Study Guide: Key Concepts and Equations

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