Question 1

Which of the following statements best explains why sodium chloride (NaCl) is classified as an ionic compound?

Accepted Answer

It is formed by the transfer of electrons from sodium (a metal) to chlorine (a nonmetal), resulting in oppositely charged ions.

Question 2

Which of the following elements will form a $$2^+$$ cation when it becomes an ion?

Accepted Answer

Magnesium

Question 3

What is the correct name for the compound $$\mathrm{N_2O_5}$$?

Accepted Answer

Dinitrogen pentoxide

Question 4

Which of the following compounds contains a polyatomic ion?

Accepted Answer

$$\mathrm{Na_2SO_4}$$

Question 5

Which of the following molecules can form hydrogen bonds with water?

Accepted Answer

$$\mathrm{NH_3$}$$

Question 6

Which of the following is the correct balanced equation for the reaction of hydrogen gas with oxygen gas to form water?

Accepted Answer

$$\mathrm{2H_2 + O_2$ \rightarrow 2H_2O}$$

Question 7

A sample of gas has a volume of $$2.0\ \mathrm{L} at a $$pressure of $$1.0\ \mathrm{atm}. If $$the pressure is increased to $$4.0\ \mathrm{atm} at $$constant temperature, what is the new volume?

Accepted Answer

$$0.5\ \mathrm{L}$$

Question 8

Which of the following statements about solubility is correct?

Accepted Answer

The solubility of a solid in water increases as temperature increases.

Question 9

Which of the following solutions will conduct electricity?

Accepted Answer

A solution of sodium chloride in water

Question 10

What is the mass percent of NaCl in a solution prepared by dissolving $$10.0\ \mathrm{g} of $$NaCl in $$90.0\ \mathrm{g} of $$water?

Accepted Answer

$$10\%$$

Question 11

Which of the following best describes why oil does not dissolve in water?

Accepted Answer

Oil is nonpolar and water is polar, so 'like dissolves like' does not apply.

Question 12

A $$5.0\ \mathrm{M}$$ stock solution of HCl is diluted to make $$250\ \mathrm{mL} of a$$ $$1.0\ \mathrm{M}$$ solution. What volume of the stock solution is required?

Accepted Answer

$$50\ \mathrm{mL}$$

Question 13

Which of the following is a molecular element that exists as a diatomic molecule under standard conditions?

Accepted Answer

Nitrogen

Question 14

Which of the following best describes the octet rule?

Accepted Answer

Atoms tend to gain, lose, or share electrons to achieve eight electrons in their outer shell.

Question 15

Which of the following is the correct name for $$\mathrm{Ca(NO_3$)_2}$$?

Accepted Answer

Calcium nitrate

Question 16

A mixture of gases contains $$2.0\ \mathrm{atm} of $$oxygen, $$1.0\ \mathrm{atm} of $$nitrogen, and $$0.5\ \mathrm{atm} of $$carbon dioxide. What is the total pressure according to Dalton’s Law?

Accepted Answer

$$3.5\ \mathrm{atm}$$

Question 17

Which of the following best describes an electrolyte?

Accepted Answer

A substance that dissolves in water to produce a solution that conducts electricity.

Question 18

Which of the following is the correct formula for aluminum oxide?

Accepted Answer

$$\mathrm{Al_2O_3}$$

Question 19

Which of the following statements about balancing chemical equations is correct?

Accepted Answer

Only the coefficients in a chemical equation can be changed to balance the equation.

Question 20

A solution is prepared by dissolving $$5.0\ \mathrm{g} of $$glucose in enough water to make $$100\ \mathrm{mL} of $$solution. What is the mass/volume percent of glucose in the solution?

Accepted Answer

$$5\%$$

Study Guide: Ionic and Molecular Compounds, Chemical Reactions, Gases, and Solutions

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