Q: Which of the following compounds is an electrolyte when dissolved in water, and why?

NaCl, because it dissociates completely into Na$^+$ and Cl$^-$ ions.

Q: Which of the following solutions contains the greatest number of sodium ions?

100 mL of 1.0 M Na$_2$SO$_4$

Question 1

Which of the following compounds is an electrolyte when dissolved in water, and why?

Accepted Answer

NaCl, because it dissociates completely into Na$^+$ and Cl$^-$ ions.

Question 2

A student dissolves 5.85 g of NaCl (molar mass = 58.44 g/mol) in enough water to make 500 mL of solution. What is the molarity of the solution?

Accepted Answer

$0.200\ \mathrm{M}$

Question 3

Which of the following is the correct net ionic equation for the reaction between aqueous solutions of AgNO$_3$ and NaCl?

Accepted Answer

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

Question 4

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

Accepted Answer

$\mathrm{CH}_2\mathrm{O}$

Question 5

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

Accepted Answer

The reactant that determines the maximum amount of product that can be formed.

Question 6

A reaction has a theoretical yield of 10.0 g, but only 7.5 g of product is actually obtained. What is the percent yield?

Accepted Answer

$75\%$

Question 7

Which of the following is a correct balanced equation for the combustion of propane ($\mathrm{C}_3\mathrm{H}_8$)?

Accepted Answer

$\mathrm{C}_3\mathrm{H}_8 + 5\ \mathrm{O}_2 \rightarrow 3\ \mathrm{CO}_2 + 4\ \mathrm{H}_2\mathrm{O}$

Question 8

Which of the following solutions contains the greatest number of sodium ions?

Accepted Answer

100 mL of 1.0 M Na$_2$SO$_4$

Question 9

Which of the following is the correct formula for sulfuric acid?

Accepted Answer

$\mathrm{H}_2\mathrm{SO}_4$

Question 10

A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. What volume of NaOH is required to reach the equivalence point?

Accepted Answer

$25.0\ \mathrm{mL}$

Question 11

Which of the following best describes a precipitation reaction?

Accepted Answer

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

Question 12

Which of the following is the correct molar mass of calcium nitrate, $\mathrm{Ca(NO}_3)_2$?

Accepted Answer

$164\ \mathrm{g/mol}$

Question 13

If 2.00 g of hydrogen gas reacts with 16.0 g of oxygen gas to form water, which reactant is limiting and what mass of water is produced? ($\mathrm{H}_2 + \frac{1}{2}\mathrm{O}_2 \rightarrow \mathrm{H}_2\mathrm{O}$)

Accepted Answer

Hydrogen is limiting; 18.0 g of water is produced.

Question 14

Which of the following is a strong acid?

Accepted Answer

Hydrochloric acid ($\mathrm{HCl}$)

Question 15

Which of the following best describes the role of an indicator in an acid-base titration?

Accepted Answer

It changes color at the equivalence point to signal the end of the reaction.

Question 16

A solution is prepared by dissolving 10.0 g of KNO$_3$ (molar mass = 101.1 g/mol) in enough water to make 250 mL of solution. What is the molarity of the solution?

Accepted Answer

$0.40\ \mathrm{M}$

Question 17

Which of the following pairs will NOT form a precipitate when mixed?

Accepted Answer

KNO$_3$ and NaCl

Question 18

Which of the following is the correct percent composition by mass of oxygen in water ($\mathrm{H}_2\mathrm{O}$)?

Accepted Answer

$88.9\%$

Question 19

How many molecules are present in 18.0 g of water ($\mathrm{H}_2\mathrm{O}$)? ($\mathrm{Molar\ mass} = 18.0\ \mathrm{g/mol}$)

Accepted Answer

$6.02 	imes 10^{23}$

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