Question 1

Which of the following is the correctly balanced equation for the reaction between sodium and hydrogen gas to form sodium hydride?

Accepted Answer

$$2\,\mathrm{Na} + \mathrm{H}_2 \rightarrow 2\,\mathrm{NaH}$$

Question 2

What type of reaction is represented by the following equation? $$2\,\mathrm{KClO}_3 \rightarrow 2\,\mathrm{KCl} + 3\,\mathrm{O}_2$$

Accepted Answer

Decomposition

Question 3

Given the reaction $$\mathrm{CuCl}_2 + 2\,\mathrm{NaNO}_3 \rightarrow 2\,\mathrm{NaCl} + \mathrm{Cu(NO}_3)_2$$, how many grams of sodium chloride are produced when 68 g of copper(II) chloride reacts with excess sodium nitrate? (Molar masses: $$\mathrm{CuCl}_2 = 134.45\,\mathrm{g/mol}$$, $$\mathrm{NaCl} = 58.44\,\mathrm{g/mol})$$

Accepted Answer

$$59.2\,\mathrm{g}$$

Question 4

Which of the following is the net ionic equation for the reaction between potassium chromate and calcium chloride in aqueous solution?

Accepted Answer

$$\mathrm{Ca}^{2+} (aq) + \mathrm{CrO}_4$$^{2-}$$ (aq) \rightarrow \mathrm{CaCrO}_4 (s)$$

Question 5

A balloon contains $$30.1\,\mathrm{L} of$$ $$\mathrm{CO}_2 at$$ $$47^\circ\mathrm{C}$$ and $$73.1\,\mathrm{kPa}. $$How many moles of $$\mathrm{CO}_2$$ does the balloon contain? $$(R = 8.314\,\mathrm{L\cdot kPa\cdot K}^{-1}\mathrm{\cdot mol}^{-1})$$

Accepted Answer

$$0.89\,\mathrm{mol}$$

Question 6

Which of the following best describes the reaction: $$2\,\mathrm{K} + 2\,\mathrm{H}_2\mathrm{O} \rightarrow 2\,\mathrm{KOH} + \mathrm{H}_2$$?

Accepted Answer

Single replacement

Question 7

If $$17.0\,\mathrm{moles} of $$ammonia ($$\mathrm{NH}_3) $$react with oxygen gas according to $$4\,\mathrm{NH}_3 + 5\,\mathrm{O}_2 \rightarrow 4\,\mathrm{NO} + 6\,\mathrm{H}_2\mathrm{O}$$, how many moles of oxygen gas are needed?

Accepted Answer

$$21.25\,\mathrm{mol}$$

Question 8

Which of the following is the correct complete ionic equation for the reaction between lithium hydroxide and barium chloride?

Accepted Answer

$$2\,\mathrm{Li}^+ (aq) + 2\,\mathrm{OH}^- (aq) + \mathrm{Ba}^{2+} (aq) + 2\,\mathrm{Cl}^- (aq) \rightarrow 2\,\mathrm{Li}^+ (aq) + 2\,\mathrm{Cl}^- (aq) + \mathrm{Ba(OH)}_2 (s)$$

Question 9

What is the net ionic equation for the reaction between sodium carbonate and magnesium nitrate in aqueous solution?

Accepted Answer

$$\mathrm{Mg}^{2+} (aq) + \mathrm{CO}_3$$^{2-}$$ (aq) \rightarrow \mathrm{MgCO}_3 (s)$$

Question 10

A reaction produces $$35.4\,\mathrm{g} of $$water. How many moles of water is this? $$(\mathrm{Molar\ mass\ of\ H}_2\mathrm{O} = 18.02\,\mathrm{g/mol})$$

Accepted Answer

$$1.96\,\mathrm{mol}$$

Question 11

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

Accepted Answer

$$2\,\mathrm{Al} + 6\,\mathrm{HCl} \rightarrow 2\,\mathrm{AlCl}_3 + 3\,\mathrm{H}_2$$

Question 12

Identify the type of reaction and predict the products for the following: $$\mathrm{Ca} + \mathrm{N}_2 \rightarrow$$

Accepted Answer

Synthesis; $$3\,\mathrm{Ca} + \mathrm{N}_2 \rightarrow \mathrm{Ca}_3\mathrm{N}_2$$

Question 13

A mixture contains $$112.5\,\mathrm{g} of$$ $$\mathrm{NO}$$ vapor and $$44.1\,\mathrm{g} of$$ $$\mathrm{CO}_2$$ gas. If the total pressure of the mixture is $$564\,\mathrm{mmHg}$$, what is the partial pressure of $$\mathrm{NO}$$? (Molar masses: $$\mathrm{NO} = 30.01\,\mathrm{g/mol}$$, $$\mathrm{CO}_2 = 44.01\,\mathrm{g/mol})$$

Accepted Answer

$$376\,\mathrm{mmHg}$$

Question 14

Which of the following is the correct net ionic equation for the reaction between lithium hydroxide and hydrochloric acid?

Accepted Answer

$$\mathrm{OH}^- (aq) + \mathrm{H}^+ (aq) \rightarrow \mathrm{H}_2\mathrm{O} (l)$$

Question 15

What is the concentration of a phosphoric acid solution if $$97\,\mathrm{mL}$$ are neutralized by $$95\,\mathrm{mL} of$$ $$2.4\,\mathrm{M}\,\mathrm{KOH}$$? (Balanced equation: $$\mathrm{H}_3\mathrm{PO}_4 + 3\,\mathrm{KOH} \rightarrow \mathrm{K}_3\mathrm{PO}_4 + 3\,\mathrm{H}_2\mathrm{O})$$

Accepted Answer

$$0.71\,\mathrm{M}$$

Question 16

Which of the following is the correct balanced equation for the reaction between potassium and chlorine gas?

Accepted Answer

$$2\,\mathrm{K} + \mathrm{Cl}_2 \rightarrow 2\,\mathrm{KCl}$$

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