Question 1

Which of the following best describes the difference between a strong electrolyte and a weak electrolyte in aqueous solution?

Accepted Answer

A strong electrolyte dissociates completely into ions, while a weak electrolyte dissociates only partially.

Question 2

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

Accepted Answer

$$CH_4(g) + 2O_2(g$$) \rightarrow $$CO_2(g) + 2H_2O(g$$)$$

Question 3

A solution of NaCl(aq) is mixed with AgNO$$_3(aq). $$What is the net ionic equation for the precipitation reaction that occurs?

Accepted Answer

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

Question 4

Which of the following compounds is expected to be insoluble in water based on solubility rules?

Accepted Answer

$$PbSO_4$$

Question 5

Which statement correctly describes the Arrhenius definition of an acid?

Accepted Answer

An acid is a substance that produces $$H^+$$ ions in aqueous solution.

Question 6

Which of the following is a diprotic acid?

Accepted Answer

$$H_2SO_4$$

Question 7

What is the oxidation state of sulfur in $$SO_4$$^{2-}$$?

Accepted Answer

+6

Question 8

In the reaction $$2H_2(g) + O_2$(g) \rightarrow 2H_2O(g)$$, if you start with 3.00 moles of $$H_2$$ and 2.35 moles of $$O_2$$, what is the limiting reactant?

Accepted Answer

$$H_2$$

Question 9

Which of the following is the correct formula for calculating molarity ($$c) of a $$solution?

Accepted Answer

$$c = \frac{n}{V}$$

Question 10

A student dissolves 0.25 g of KOH (molar mass = 56.11 g/mol) in 125 mL of water. What is the molarity of the solution?

Accepted Answer

$$0.020$$ mol/L

Question 11

Which of the following is a correct statement about oxidation and reduction?

Accepted Answer

Oxidation is the loss of electrons, and reduction is the gain of electrons.

Question 12

Which species acts as the oxidizing agent in the reaction $$C(s) + 2S(s) \rightarrow CS_2$(s)$$?

Accepted Answer

$$S$$

Question 13

What is the sum of oxidation states for all atoms in a neutral molecule?

Accepted Answer

Zero

Question 14

Which of the following is the correct balanced half-reaction for the oxidation of $$Fe^{2+} to$$ $$Fe^{3+}$$?

Accepted Answer

$$Fe^{2+}$$ \rightarrow $$Fe^{3+} + e$$^-$$

Question 15

A 1.0 mol/L stock solution is diluted to 0.10 mol/L in a 100 mL flask. What volume of stock solution is required?

Accepted Answer

$$10 mL$$

Question 16

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

Accepted Answer

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

Question 17

Which of the following is true about the solubility of ionic compounds in water?

Accepted Answer

Salts containing $$Ag^+$$, $$Pb^{2+}$$, and $$Hg_2$$^{2+}$$ are generally insoluble.

Question 18

Which of the following is a disproportionation reaction?

Accepted Answer

$$2H_2O_2(aq) \rightarrow 2H_2O(l) + O_2$(g)$$

Question 19

If 0.25 g of KOH is dissolved in 125 mL of water, how many moles of KOH are present? (Molar mass = 56.11 g/mol)

Accepted Answer

$$0.0045$$ mol

Chapter 4: Chemical Reactions and Stoichiometry – Study Notes

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