Question 1

Which of the following correctly describes the octet rule?

Accepted Answer

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

Question 2

What is the correct formula for the ionic compound formed between aluminum and sulfate?

Accepted Answer

$$\mathrm{Al_2$(SO_4$)_3}$$

Question 3

Which of the following is the correct name for $$\mathrm{$$FeCl_3$$}$$?

Accepted Answer

Iron(III) chloride

Question 4

Which of the following compounds contains a polyatomic ion?

Accepted Answer

$$\mathrm{$$NaNO_3$$}$$

Question 5

Which of the following molecules is nonpolar?

Accepted Answer

$$\mathrm{CO_2$}$$

Question 6

What is the molecular geometry of $$\mathrm{CH_4$}$$?

Accepted Answer

Tetrahedral

Question 7

Which of the following intermolecular forces is the strongest?

Accepted Answer

Hydrogen bonding

Question 8

A sample contains $$3.01 	imes 10$$^{23}$$ molecules of $$\mathrm{$$CO_2$$}$$. How many moles of $$\mathrm{$$CO_2$$}$$ are present?

Accepted Answer

$$0.5$$ moles

Question 9

What is the molar mass of $$\mathrm{Ca(OH)_2}$$?

Accepted Answer

$$74.10\ \mathrm{g/mol}$$

Question 10

Which of the following is a decomposition reaction?

Accepted Answer

$$\mathrm{2H_2O_2 \rightarrow 2H_2O + O_2$}$$

Question 11

Which of the following statements about catalysts is correct?

Accepted Answer

A catalyst lowers the activation energy of a reaction without being consumed.

Question 12

A reaction is exothermic if:

Accepted Answer

It releases heat to the surroundings.

Question 13

According to Boyle’s Law, if the pressure on a gas is doubled at constant temperature, what happens to the volume?

Accepted Answer

It is halved.

Question 14

A gas occupies $$4.0\ \mathrm{L} at$$ $$300\ \mathrm{K}. $$What volume will it occupy at $$600\ \mathrm{K}$$, assuming constant pressure?

Accepted Answer

$$8.0\ \mathrm{L}$$

Question 15

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

Accepted Answer

$$\mathrm{CH_4$ + 2O_2 \rightarrow CO_2$ + 2H_2O}$$

Question 16

Which of the following molecules can form hydrogen bonds?

Accepted Answer

$$\mathrm{NH_3$}$$

Question 17

What is the partial pressure of oxygen in a mixture of gases at $$1.0\ \mathrm{atm}$$ total pressure, if oxygen makes up $$40\% of $$the mixture?

Accepted Answer

$$0.40\ \mathrm{atm}$$

Question 18

Which of the following is a correct application of Avogadro’s Law?

Accepted Answer

At constant temperature and pressure, doubling the number of moles of gas doubles the volume.

Question 19

Which of the following is the correct name for $$\mathrm{N_2O_5}$$?

Accepted Answer

Dinitrogen pentoxide

Question 20

How many grams of $$\mathrm{NaCl}$$ are in $$2.00$$ moles? (Molar mass of $$\mathrm{NaCl} = 58.44\ \mathrm{g/mol})$$

Accepted Answer

$$116.88\ \mathrm{g}$$

CHEM 1104 Exam 2 Study Guide: Ionic & Molecular Compounds, Chemical Reactions, and Gases

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