Question 1

Which of the following is the correct chemical formula for ammonium sulfate?

Accepted Answer

$\mathrm{(NH_4)_2SO_4}$

Question 2

A compound contains 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen by mass. What is the empirical formula of the compound?

Accepted Answer

$\mathrm{CH_2O}$

Question 3

Which of the following ions is NOT always soluble according to the solubility rules provided?

Accepted Answer

$\mathrm{SO_4^{2-}}$ (with Ca$^{2+}$, Sr$^{2+}$, Ba$^{2+}$, Pb$^{2+}$)

Question 4

What is the correct name for the compound $\mathrm{CrO_4^{2-}}$?

Accepted Answer

Chromate

Question 5

A student mixes solutions of silver nitrate ($\mathrm{AgNO_3}$) and sodium chloride ($\mathrm{NaCl}$). What type of chemical reaction occurs, and what is the precipitate formed?

Accepted Answer

Precipitation; $\mathrm{AgCl}$

Question 6

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

Accepted Answer

$\mathrm{HCl + NaOH \rightarrow NaCl + H_2O}$

Question 7

If 0.250 mol of $\mathrm{Na_2SO_4}$ is dissolved in water, how many moles of sodium ions are present in the solution?

Accepted Answer

0.500 mol

Question 8

Which of the following is a sign of a chemical reaction occurring?

Accepted Answer

Change in color

Question 9

What is the mass percent of oxygen in $\mathrm{H_2SO_4}$? (Atomic masses: H = 1.01, S = 32.07, O = 16.00)

Accepted Answer

65.3%

Question 10

Which of the following compounds is insoluble in water according to the solubility rules?

Accepted Answer

$\mathrm{BaSO_4}$

Question 11

A solution contains 0.10 mol of $\mathrm{Ca^{2+}}$ and 0.10 mol of $\mathrm{CO_3^{2-}}$. Will a precipitate form? If so, what is it?

Accepted Answer

Yes; $\mathrm{CaCO_3}$

Question 12

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

Accepted Answer

$\mathrm{CrO_4^{2-}}$

Question 13

What is the molecular weight of ammonium nitrate ($\mathrm{NH_4NO_3}$)? (Atomic masses: N = 14.01, H = 1.01, O = 16.00)

Accepted Answer

80.05 g/mol

Question 14

Which of the following is a binary molecular compound?

Accepted Answer

$\mathrm{CO_2}$

Question 15

What is the correct name for $\mathrm{Na_2CO_3}$?

Accepted Answer

Sodium carbonate

Question 16

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

Accepted Answer

$\mathrm{C_2H_3O_2^-}$

Question 17

A sample contains 0.50 mol of $\mathrm{CaCl_2}$. How many moles of chloride ions are present?

Accepted Answer

1.00 mol

Question 18

Which of the following is a correct example of a combustion reaction?

Accepted Answer

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

Question 19

Which of the following ions is always soluble in water?

Accepted Answer

$\mathrm{NH_4^+}$

Question 20

What is the mass percent of sodium in $\mathrm{Na_2SO_4}$? (Atomic masses: Na = 22.99, S = 32.07, O = 16.00)

Accepted Answer

32.4%

Exam 2 Study Guide: Ionic Compounds, Chemical Formulas, and Chemical Reactions

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