Week 14 - GC6 - Quiz

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Part I: Choose the best answer for each question: ⇱

Question 1. What is the main characteristic of a mixture?

A. Its components can not be separated by filtering.

B. Its components can be separated by filtering.

C. It contains invisible particles.

D. The physical properties of the substances after mixing change.

Question 2. Which of the following is not one of the properties of a solution?

A. Substances can not be seen after mixing.

B. Physical properties of substances remain.

C. All substances are mixed and completely dissolved.

D. Physical properties of substances are changed.

Question 3. Which tool is most useful for separating a mixture of iron filings and sand?

A. A sieve

B. Evaporate

C. magnet

D. Filter paper

Question 4. Why can't you use a sieve to separate salt that has been dissolved in water?

A. Because salt particles are small enough to pass through the sieve's holes.

B. Because the salt is too heavy.

C. Because salt becomes a liquid when it dissolves.

D. Because the water will melt the sieve.

Question 5. If you have a mixture of sand and salt, what is the best first step to separate them?

A. Use a magnet to pick up the salt.

B. Add water to the mixture.

C. Use a sieve immediately.

D. Heat the dry mixture until the sand melts.

Question 6. If you evaporate a solution of sugar and water, what will be left in the container?

A. Only the water.

B. Nothing, both will disappear

C. The dry sugar

D. A new substance that is neither sugar nor water.

Question 7. Which tool is most useful for separating a mixture of baking soda and rocks?

A. Filter paper

B. Heating

C. magnet

D. A sieve

Part II: Complete the sentence: ⇱

How can we separate the substances in the following solution?

Question 8.

Separate solids from a liquid: We can use a .

Question 9.

Separate salt from salt water: By , water evaporates and salt substance is left.

Question 10.

Separate sand from sugar: By mixing them in .

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Week 14 - GC6 - Quiz

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