Chapter 7 Solutions And Colloids Worksheet With Answers printable pdf download

Chapter 7: Solutions and Colloids

CHAPTER OUTLINE

7.1 Physical States of Solutions

7.4 Solution Concentrations

7.7 Solution Properties

7.2 Solubility

7.5 Solution Preparation

7.8 Colloids

7.3 The Solution Process

7.6 Solution Stoichiometry

7.9 Dialysis

LEARNING OBJECTIVES/ASSESSMENT

When you have completed your study of this chapter, you should be able to:

1. Classify mixtures as solutions or nonsolutions based on their appearance. (Section 7.1; Exercise 7.4)

2. Demonstrate your understanding of terms related to the solubility of solutes in solution. (Section 7.2;

Exercises 7.6 and 7.12)

3. Predict in a general way the solubilities of solutes in solvents on the basis of molecular polarity.

(Section 7.3; Exercise 7.16)

4. Calculate solution concentrations in units of molarity, weight/weight percent, weight/volume

percent, and volume/volume percent. (Section 7.4; Exercises 7.22 b, 7.30 c, 7.34 a, and 7.38 c)

5. Describe how to prepare solutions of specific concentration using pure solutes and solvent, or

solutions of greater concentration than the one desired. (Section 7.5; Exercises 7.46 and 7.48 b)

6. Do stoichiometric calculations based on solution concentrations. (Section 7.6; Exercise 7.56)

7. Do calculations based on the colligative solution properties of boiling point, freezing point, and

osmotic pressure. (Section 7.7; Exercises 7.64 a & c and 7.74)

8. Describe the characteristics of colloids. (Section 7.8; Exercise 7.82)

9. Describe the process of dialysis, and compare it to the process of osmosis. (Section 7.9; Exercise 7.84)

LECTURE HINTS AND SUGGESTIONS

1. The solubility of sugar, cooking oil and rubbing alcohol in water can be demonstrated. The difference

between the terms soluble, insoluble and miscible should be illustrated. Explain the general

statement ʺlike dissolves likeʺ and explain in terms of chemical structure and the attractive forces

between molecules.

2. The Tyndall effect can be demonstrated by passing a narrow beam of light through a solution and

then various colloidal suspensions in a darkened room. The broadening of the beam of light by the

colloidal suspension is easily visualized. Students can conduct similar studies using a flashlight on a

foggy day or a fish tank (clean & dirty).

3. Demonstrate how soap will emulsify a mixture of oil and water and how hard water interferes with

the function of a soap or detergent. A mixture of oil and water is placed in a sealed flask. Upon

shaking an emulsion will form which will settle back to two layers upon standing. The addition of a

few soap shavings will produce a more stable emulsion. The addition of a few pellets of calcium

chloride (hard water) to the water‐oil‐soap mixture will break down the emulsion.

SOLUTIONS FOR THE END OF CHAPTER EXERCISES

PHYSICAL STATES OF SOLUTIONS (SECTION 7.1)

7.1

Solvent

Solutes

a. Antiseptic mouthwash: alcohol 25%, thymol,

water

alcohol, thymol, eucalyptol,

eucalyptol, methyl salicylate, menthol,

methyl salicylate, menthol,

benzoic acid, boric acid

b. Paregoric: alcohol 45%, opium 0.4%

water

alcohol, opium

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Chapter 7 Solutions And Colloids Worksheet With Answers

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