Question 1

Which of the following chemical equations is NOT balanced?

Accepted Answer

$$2 \ \mathrm{KNO}_3 + 10 \ \mathrm{K} \rightarrow 5 \ \mathrm{K}_2\mathrm{O} + \mathrm{N}_2$$

Question 2

A student wants to prepare 4.0 L of a 3.0 M NaCl solution for a laboratory experiment. How many moles of NaCl are required?

Accepted Answer

$$12 \ \mathrm{moles}$$

Question 3

Which law states that the total number of each type of atom must be the same on both sides of a chemical equation?

Accepted Answer

Law of Conservation of Matter

Question 4

A gas is enclosed in a cylinder at a volume of $$5.00 \ \mathrm{L}$$ and a pressure of $$0.500 \ \mathrm{atm}. If $$the volume is decreased to $$3.00 \ \mathrm{L} at $$constant temperature, what is the new pressure?

Accepted Answer

$$0.833 \ \mathrm{atm}$$

Question 5

Which of the following substances will NOT exhibit hydrogen bonding as a significant intermolecular force?

Accepted Answer

$$\mathrm{CI}_4$$

Question 6

A balloon is filled to $$3.0 \ \mathrm{L} at$$ $$-35^\circ \mathrm{C}$$ outdoors. When brought indoors to $$25^\circ \mathrm{C} at $$constant pressure, what is the new volume of the balloon? (Assume ideal gas behavior.)

Accepted Answer

$$3.8 \ \mathrm{L}$$

Question 7

Which of the following best explains why water ($$\mathrm{H}_2\mathrm{O}) is a $$liquid at room temperature while methane ($$\mathrm{CH}_4) is a $$gas?

Accepted Answer

The intermolecular forces in water are stronger than those in methane.

Question 8

How many molecules are present in $$237 \ \mathrm{g} of $$water? (Molar mass of water $$= 18 \ \mathrm{g/mol}$$, Avogadro's number $$= 6.02 	imes 10$$^{23}$$)

Accepted Answer

$$7.92 	imes 10$$^{24}$$

Question 9

Which of the following is the weakest type of intermolecular force?

Accepted Answer

Dispersion forces

Question 10

A sample of gas at $$350 \ \mathrm{K}$$ has a volume of $$4.00 \ \mathrm{L}. If $$the pressure remains constant, what is the volume at $$175 \ \mathrm{K}$$?

Accepted Answer

$$2.00 \ \mathrm{L}$$

Question 11

Which of the following statements is NOT a postulate of the kinetic-molecular theory of gases?

Accepted Answer

The molecules of a gas are strongly attracted to each other.

Question 12

What is the molarity of a solution that contains $$8.0 \ \mathrm{g} of $$NaOH in $$1.0 \ \mathrm{L} of $$solution? (Molar mass of NaOH $$= 40 \ \mathrm{g/mol})$$

Accepted Answer

$$0.20 \ \mathrm{M}$$

Question 13

Which of the following has the same number of atoms as $$35.4 \ \mathrm{g} of $$chlorine? (Atomic mass: Cl = 35.4, C = 12, K = 39, Ge = 72.6)

Accepted Answer

$$12 \ \mathrm{g} of $$carbon

Question 14

A $$1\% by $$mass solution contains:

Accepted Answer

$$1 \ \mathrm{g} of $$solute in $$100 \ \mathrm{g} of $$solution

Question 15

Which of the following best describes the state of matter where molecules are close together but move randomly?

Accepted Answer

Liquid

Question 16

What is the mass of $$0.500 \ \mathrm{mol} of$$ $$\mathrm{NH}_3$$? (Molar mass of $$\mathrm{NH}_3 = 17 \ \mathrm{g/mol})$$

Accepted Answer

$$8.50 \ \mathrm{g}$$

Question 17

Which of the following is the correct value for the volume of one mole of any ideal gas at STP?

Accepted Answer

$$22.4 \ \mathrm{liters}$$

Question 18

A $$4.00 \ \mathrm{L}$$ tank contains nitrogen gas at $$3.00 \ \mathrm{atm}$$ and $$27^\circ \mathrm{C}. $$Using the ideal gas law ($$R = 0.0821 \ \mathrm{L} \cdot \mathrm{atm}/(\mathrm{K} \cdot \mathrm{mol})$$), how many moles of nitrogen are present?

Accepted Answer

$$0.480 \ \mathrm{mol}$$

Question 19

Which of the following best describes Avogadro's hypothesis?

Accepted Answer

Equal volumes of gases at the same temperature and pressure have the same number of molecules.

Question 20

Which of the following is the predominant intermolecular force between $$\mathrm{HCl}$$ molecules?

Accepted Answer

Dipole forces

Intro to Chemistry: Chapter 5 & 6 Review – Step-by-Step Study Guidance

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