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Answer key

Chapter: 08. Some Properties Of Water

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Practice Exam: Some Properties of Water

Instructions:

Read each question carefully.

Answer all questions to the best of your ability.

Good luck!

I. Multiple Choice Questions (Choose the best answer)

Which form of water has a fixed shape and size? a) Liquid water b) Water vapour c) Ice d) Steam

The process in which a solid changes into a liquid on heating is called: a) Evaporation b) Condensation c) Solidification d) Melting

In a solution of sugar and water, what is the sugar called? a) Solvent b) Solution c) Solute d) Vapour

Which of these substances is typically insoluble in water? a) Salt b) Sugar c) Oil d) Flour

II. Fill in the Blanks

Liquid water takes the _ _ _ _ __ _ _ _ _ _ _ _ __ _ _ of the container in which it is stored.

The process in which a liquid changes into vapours (gaseous state) on heating is known as _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ .

Water is commonly called the _ _ _ _ _ _ _ _ _ _ _ _ _ solvent.

If an object displaces _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ water than its own weight, it will sink.

Freezing is the reverse of _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ .

III. True/False Questions

Water vapour has a fixed shape and size. (True/False)

Stirring a solute into a solvent makes the solution form faster. (True/False)

All objects that are bigger will sink in water. (True/False)

Condensation happens when a gas changes into a liquid on cooling. (True/False)

IV. Explanation of Terms

Define ‘Solution’.

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Define ‘Insoluble substances’.

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V. Short Answer Questions

Name the three different forms of water.

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List two ways to make sugar dissolve faster in water.

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What happens to water when it is heated in a pot until steam appears? Explain the process.

____________________________________________________________________________________________________________

VI. Diagram-Based Question

Below is a diagram showing different states of water and processes.

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a) Name the processes represented by arrows A and B.

b) Name the processes represented by arrows C and D.

c) Which symbols (sun or snowflake) indicate processes that involve cooling?

____________________________________________________________________________________________________________

VII. Long Answers

Explain why water is often called the “universal solvent.”

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Describe the difference between why a wooden block floats and a metal key sinks in water.

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VIII. Identifying and/or Differentiate Concepts/Processes

Differentiate between Solute and Solvent.

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Differentiate between Melting and Freezing.

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