Question 1

Which of the following compounds is ionic?

Accepted Answer

NaCl

Question 2

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

Accepted Answer

Dinitrogen pentoxide

Question 3

How many moles of $$\mathrm{CO_2$}$$ molecules are present in $$1.204 	imes 10$$^{24}$$ molecules of $$\mathrm{$$CO_2$$}$$?

Accepted Answer

$$2.00$$ moles

Question 4

Which of the following elements typically forms three bonds in molecular compounds?

Accepted Answer

Nitrogen

Question 5

What is the molecular shape and bond angle of $$\mathrm{CH_4$}$$?

Accepted Answer

Tetrahedral, $$109^\circ$$

Question 6

Which of the following molecules is nonpolar?

Accepted Answer

$$\mathrm{CO_2$}$$

Question 7

What is the molar mass of $$\mathrm{Na_2SO_4}$$?

Accepted Answer

$$142 g/$$mol

Question 8

A sample of gas has a pressure of $$2.00$$ atm. What is this pressure in mmHg?

Accepted Answer

$$1520$$ \ \mathrm{mmHg}$

Question 9

Which intermolecular force is strongest in $$\mathrm{H_2O}$$?

Accepted Answer

Hydrogen bonding

Question 10

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

Accepted Answer

The volume is halved

Question 11

Which of the following is a correct balanced equation for the reaction of sodium with chlorine to form sodium chloride?

Accepted Answer

$$2\mathrm{Na} + \mathrm{Cl}_2 \rightarrow 2\mathrm{NaCl}$$

Question 12

Which of the following statements about the octet rule is correct?

Accepted Answer

Hydrogen seeks a duet, not an octet

Question 13

A 5.00 g sample of $$\mathrm{NaCl}$$ contains how many moles of $$\mathrm{NaCl}$$? (Molar mass = $$58.5 g/$$mol)

Accepted Answer

$$0.0855$$ \ \mathrm{mol}$

Question 14

Which of the following molecules has a trigonal pyramidal shape?

Accepted Answer

$$\mathrm{NH_3$}$$

Question 15

Which gas law explains why a balloon shrinks when placed in a freezer?

Accepted Answer

Charles’s Law

Question 16

What is the partial pressure of oxygen in a mixture of gases if the total pressure is $$1.00$$ atm and oxygen makes up $$21\% of $$the mixture?

Accepted Answer

$$0.21$$ \ \mathrm{atm}$

Question 17

Which of the following is a property of gases explained by the kinetic molecular theory?

Accepted Answer

Gases have no definite shape or volume

Question 18

Which of the following is the correct formula for ammonium sulfate?

Accepted Answer

$$\mathrm{(NH_4$)_2SO_4}$$

Question 19

Which of the following best describes an exothermic reaction?

Accepted Answer

The products have lower energy than the reactants

Question 20

A sample of gas occupies $$4.00 L at$$ $$1.00$$ atm. What will its volume be at $$2.00$$ atm, assuming temperature and amount of gas remain constant?

Accepted Answer

$$2.00$$ \ \mathrm{L}$

Exam II Study Guide: Ionic and Molecular Compounds, Chemical Quantities, and Gases

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