Q: Given the reaction $$2H_2 + O_2$ \rightarrow 2H_2O$$, how many grams of $$H_2O$$ can be produced from 4.00 g of $$H_2$$ and excess $$O_2$$? (Molar mass of $$H_2 = 2.02$ g/mol, H_2O = 18.02$ g/mol)

$$4.00 \text{ g } H_2$ \times \frac{1 \text{ mol } H_2$}{2.02 \text{ g } H_2$} \times \frac{2 \text{ mol } H_2O}{2 \text{ mol } H_2$} \times \frac{18.02 \text{ g } H_2O}{1 \text{ mol } H_2O} = 35.7 \text{ g } H_2O$$

Question 1

Which of the following best describes the limiting reactant in a chemical reaction?

Accepted Answer

The reactant that is completely consumed first and determines the amount of product formed.

Question 2

Given the reaction $$2H_2 + O_2$ \rightarrow 2H_2O$$, how many grams of $$H_2O$$ can be produced from 4.00 g of $$H_2$$ and excess $$O_2$$? (Molar mass of $$H_2 = 2.02$ g/mol, H_2O = 18.02$ g/mol)

Accepted Answer

$$4.00 	ext{ g } H_2$ 	imes \frac{1 	ext{ mol } H_2$}{2.02 	ext{ g } H_2$} 	imes \frac{2 	ext{ mol } H_2O}{2 	ext{ mol } H_2$} 	imes \frac{18.02 	ext{ g } H_2O}{1 	ext{ mol } H_2O} = 35.7 	ext{ g } H_2O$$

Question 3

Which of the following is the correct net ionic equation for the reaction between $$AgNO_3(aq$$)$$ and $$NaCl(aq)$$?

Accepted Answer

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

Question 4

A student mixes $$KNO_3(aq$$)$$ and $$PbI_2$$(aq). $$Which of the following statements is correct regarding the products?

Accepted Answer

$$PbI_2$$ will precipitate out of solution.

Question 5

Which of the following best describes a strong electrolyte?

Accepted Answer

A substance that completely ionizes in water.

Question 6

What is the molarity of a solution prepared by dissolving 5.00 g of $$NaCl ($$molar mass = 58.44 g/mol) in enough water to make 250.0 mL of solution?

Accepted Answer

$$0.342 	ext{ M}$$

Question 7

Which of the following is the correct oxidation state for sulfur in $$H_2SO_4$$?

Accepted Answer

$$+6$$

Question 8

Which of the following metals will react with $$CuSO_4(aq$$)$$ to produce Cu(s$$)$$, based on the activity series?

Accepted Answer

Zn

Question 9

A solution is prepared by diluting 50.0 mL of 6.00 M $$HCl to a $$final volume of 300.0 mL. What is the final concentration?

Accepted Answer

$$1.00 	ext{ M}$$

Question 10

Which of the following is the correct net ionic equation for the reaction of $$HCl(aq)$$ with $$NaOH(aq)$$?

Accepted Answer

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

Question 11

Which of the following statements about oxidation and reduction is correct?

Accepted Answer

Oxidation is the loss of electrons.

Question 12

What is the oxidation state of nitrogen in $$NO_3$$^-$$?

Accepted Answer

$$+5$$

Question 13

Which of the following is a correct description of a precipitation reaction?

Accepted Answer

A reaction in which an insoluble solid forms when two aqueous solutions are mixed.

Question 14

Which of the following is the correct balanced molecular equation for the reaction shown in the first image (mixing $$KI$$ and $$Pb(NO_3$)_2$$)?

Accepted Answer

$$2KI(aq) + Pb(NO_3$)_2(aq) \rightarrow 2KNO_3(aq) + $$PbI_2$$(s)$$

Question 15

Which of the following is the correct sequence for solving a mass-to-mass stoichiometry problem?

Accepted Answer

grams A $$\rightarrow$$ moles A $$\rightarrow$$ mole ratio $$\rightarrow$$ moles B $$\rightarrow$$ grams B

Question 16

Which of the following is true about the activity series of metals?

Accepted Answer

Metals at the top have the strongest tendency to lose electrons.

Question 17

A student wants to prepare 500.0 mL of 0.200 M $$NaCl$$ solution from solid $$NaCl. $$What mass of $$NaCl is $$required? (Molar mass = 58.44 g/mol)

Accepted Answer

2.92 g

Question 18

Which of the following is the correct net ionic equation for the reaction between $$BaCl_2(aq$$)$$ and Na_2SO_4(aq$$)$$?

Accepted Answer

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

Question 19

Which of the following is the correct oxidation state for oxygen in $$H_2O_2$$?

Accepted Answer

$$-1$$

General Chemistry I: Chemical Reactions, Stoichiometry, and Solutions (Chapters 4 & 5)

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