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$$_2SO$_4$$

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}$$

General Chemistry Exam Study Guide: Key Topics and Concepts

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