Q: Which of the following is the correct formula for calculating mass/volume percent $$(\%\ m/v) of a $$solution?

$$\%\ m/v = \frac{\text{mass of solute (g)}}{\text{volume of solution (mL)}} \times 100$$

Question 1

Which of the following best explains why water has a much higher boiling point than methane, even though both are small molecules?

Accepted Answer

Water molecules form hydrogen bonds, which are much stronger than the London dispersion forces between methane molecules.

Question 2

A solution is prepared by dissolving 58.5 g of NaCl in enough water to make 1.00 L of solution. What is the molarity of the solution? $$(	ext{NaCl molar mass} = 58.5\ 	ext{g/mol})$$

Accepted Answer

$$1.00\ 	ext{M}$$

Question 3

Which of the following statements about Henry's Law is correct?

Accepted Answer

The solubility of a gas in a liquid is directly proportional to the partial pressure of the gas above the liquid.

Question 4

Which intermolecular force is primarily responsible for the high surface tension of water?

Accepted Answer

Hydrogen bonding

Question 5

A reaction is found to be first order in A and second order in B. What is the rate law for this reaction?

Accepted Answer

$$	ext{rate} = k[A][B]^2$$

Question 6

Which of the following best describes a colligative property?

Accepted Answer

A property that depends on the number of solute particles, not their identity.

Question 7

Which of the following is the correct expression for the freezing point depression of a solution?

Accepted Answer

$$\Delta T_f = iK_f m$$

Question 8

A catalyst increases the rate of a chemical reaction by:

Accepted Answer

Lowering the activation energy of the reaction.

Question 9

Which of the following organic compounds contains a carbonyl group bonded to two hydrocarbon groups?

Accepted Answer

Ketone

Question 10

A sample of gas is collected over water at $$25^\circ	ext{C}$$ and a total pressure of $$760\ 	ext{mmHg}. $$The vapor pressure of water at $$25^\circ	ext{C} is$$ $$24\ 	ext{mmHg}. $$What is the partial pressure of the dry gas?

Accepted Answer

$$736\ 	ext{mmHg}$$

Question 11

Which of the following best explains why salt is spread on icy roads in winter?

Accepted Answer

Salt lowers the freezing point of water, causing ice to melt at lower temperatures.

Question 12

Which of the following is the correct integrated rate law for a first-order reaction?

Accepted Answer

$$\ln [A]_t = -kt + \ln [A]_0$$

Question 13

Which of the following statements about polymers is correct?

Accepted Answer

Polymers are large molecules made by linking together many small units called monomers.

Question 14

Which of the following is the correct formula for calculating mass/volume percent $$(\%\ m/v) of a $$solution?

Accepted Answer

$$\%\ m/v = \frac{	ext{mass of solute (g)}}{	ext{volume of solution (mL)}} 	imes 100$$

Question 15

Which of the following best describes the effect of increasing temperature on the rate of a chemical reaction?

Accepted Answer

It increases the rate by increasing the number of molecules with sufficient energy to overcome the activation energy barrier.

CHEM 102: Exam 1 & Homework 1 Assignments Syllabus and Reading Guide

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