Week 14 - GC6 - Quiz - YourHomework

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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?

Its components can be separated by filtering.

The physical properties of the substances after mixing change.

Its components can not be separated by filtering.

It contains invisible particles.

(Điểm: 1)

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

Physical properties of substances are changed.

Substances can not be seen after mixing.

Physical properties of substances remain.

All substances are mixed and completely dissolved.

(Điểm: 1)

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

Filter paper

Evaporate

A sieve

magnet

(Điểm: 1)

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

Because the salt is too heavy.

Because salt becomes a liquid when it dissolves.

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

Because the water will melt the sieve.

(Điểm: 1)

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

Heat the dry mixture until the sand melts.

Use a magnet to pick up the salt.

Use a sieve immediately.

Add water to the mixture.

(Điểm: 1)

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

The dry sugar

A new substance that is neither sugar nor water.

Nothing, both will disappear

Only the water.

(Điểm: 1)

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

Filter paper

magnet

A sieve

Heating

(Điểm: 1)

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 _ _ _ _ _.

(Điểm: 1)

Question 9.

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

(Điểm: 1)

Question 10.

Separate sand from sugar: By mixing them in _ _ _ _ _.

(Điểm: 1)

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Week 14 - GC6 - Quiz - YourHomework