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CHAPTER 3
ASSESSMENT
Chapter 3 Chapter Test
Name:
Date:
Goal
To test your knowledge of mixtures, solubility, and concentration.
What to Do
Read the instructions carefully before answering each set of questions.
Multiple Choice (10 marks)
Read each question and the list of possible answers. Circle the best answer.
1. A mixture that appears to contain only one
kind of particle is called a:
4. How could you make a solute dissolve
more quickly?
(a) mechanical mixture
(a) Decrease temperature
(b) element
(b) Increase temperature
(c) compound
(c) Increase the amount of solute
(d) solution
(d) Decrease the amount of solvent
2. The mass of solute per volume of solution
is referred to as the substance’s:
5. How well a substance will dissolve in a
solvent is defined as the substance’s:
(a) solubility
(a) concentration
(b) concentration
(b) mixture
(c) solute
(c) solution
(d) solvent
3. Which of the following is the best
definition of a mechanical mixture?
(d) solubility
6. Brass is a mixture of 80% copper and 20%
zinc. Which part is the solvent?
(a) The amount of solute in a solution.
(a) Zinc
(b) The substance in which the solute
dissolves.
(b) Brass
(c) A substance that appears to have more
than one type of particle.
(d) Copper
(d) Two or more substances combined to
form a mixture that is uniform
throughout.
(c) Water
7. When a substance will not dissolve in a
solvent, how is the substance classified?
8. What process is used to collect salt from
a salt-water solution?
(a) concentration
a) mechanical separation
(b) solubility
b) crystallization
(c) insoluble
c) distillation
(d) soluble
d) filtration
Use the following information to answer
questions 9 and 10.
9. Which solute has the highest solubility at
40°C?
a) ammonium chloride
b) potassium chlorate
c) sodium chlorate
d) sodium chloride
10. Find the point on the graph at which
potassium chlorate has a solubility of
210g/L. What is the temperature of the
solution at this point?
(a) 30°C
(b) 40°C
(c) 50°C
(d) 60°C
Short Answer (15 marks)
Read each question carefully. Write your answer in the space provided. Answers in point form are
permitted.
1. Describe the difference between a solution and a mechanical mixture. Give one example of
each. (4 marks)
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2.
A sample of well water contains 0.24 g/L of iron.
(a) Explain what the expression “0.24 g/L” means. (1 mark)
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(b) What is this expression called? (1 mark )___________________________________________
3. This figure shows how temperature changes the solubility of potassium nitrate (KNO3).
(a) Is potassium nitrate (KNO3) more soluble at 20°C or at 60°C?________________________
(1 mark)
(b) Based on this graph, as temperature increases, what happens to the solubility of potassium
nitrate? Explain why this happens in terms of particle theory. (2 marks)
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4. Identify the order of the steps for the water purification process. (4 marks)
___ Alum surrounds dirt making the particles heavy.
___ Filters remove solid particles.
___ Chemicals such as chlorine kill remaining bacteria.
___ The heavy particles sink to the bottom. Clearer water is poured off the top.
5.
List and describe 2 ways to separate mechanical mixtures (2 marks)
1._____________________________________________________________________________
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2._____________________________________________________________________________
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