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?

The physical properties of the substances after mixing change.

Its components can be separated by filtering.

It contains invisible particles.

Its components can not be separated by filtering.

(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.

All substances are mixed and completely dissolved.

Physical properties of substances remain.

(Điểm: 1)

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

A sieve

Evaporate

magnet

Filter paper

(Điểm: 1)

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

Because the water will melt the sieve.

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

Because salt becomes a liquid when it dissolves.

Because the salt is too heavy.

(Điểm: 1)

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

Add water to the mixture.

Heat the dry mixture until the sand melts.

Use a sieve immediately.

Use a magnet to pick up the salt.

(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?

Heating

Filter paper

A sieve

magnet

(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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