Question 1

Which statement identifies why oxygen is classified as a pure substance and air is classified as a mixture?

Accepted Answer

Oxygen contains only one substance, but air contains several substances.

Answer

Oxygen has a higher density than air.

Answer

Oxygen goes under a phase change, whereas air is always a gas.

Answer

Oxygen is more reactive than air.

Question 2

Which of the following explains why saltwater is considered a mixture?

Accepted Answer

It is composed of two or more substances and retains their own chemical properties.

Answer

It is composed of one compound.

Answer

It is composed of one element.

Answer

It is composed of two or more substances and has new chemical properties.

Question 3

When iron filings and sulfur powder are mixed together at room temperature, which one of the following statements is correct?

Accepted Answer

The iron may be separated from the mixture by using a magnet.

Answer

The sulfur may be separated from the mixture by dissolving it in water.

Answer

They cannot be separated from each other.

Answer

A new compound called iron sulphide is formed

Question 4

Which of the following represents the particles in a mixture?

Accepted Answer

https://uploads.quizalize.com/f6bd3e60-955f-4f01-8178-3ed2081f7c2f/question/691277ba0234c8390db1dab399c5f4fd3cd7463f.jpg

Answer

https://uploads.quizalize.com/f6bd3e60-955f-4f01-8178-3ed2081f7c2f/question/6203b959ffde0d139fd7d78c85ad9484c0625972.jpg

Answer

https://uploads.quizalize.com/f6bd3e60-955f-4f01-8178-3ed2081f7c2f/question/64cf37406710f86e915a25b8bd35fbf42fab9822.jpg

Answer

https://uploads.quizalize.com/f6bd3e60-955f-4f01-8178-3ed2081f7c2f/question/f2c209159638f06ac4e51299774f7d365eefaac0.jpg

Question 5

Which one of the following is a mixture?

Accepted Answer

Sea water

Answer

Oxygen

Answer

Water

Answer

Oxygen

Question 6

How is a mixture different from a compound?

Accepted Answer

Each substance in a mixture keeps most of its characteristic properties.

Answer

Solids, liquids and gases can form mixtures.

Answer

Mixtures have two or more components.

Answer

Mixtures are commonly found in nature.

Question 7

Ariel combines water, sugar, and lemon juice to form lemonade. What type of substance was made?

Accepted Answer

Mixture

Answer

Element

Answer

Compound

Answer

Molecule

Question 8

Dyes in water soluble markers may be separated by means of..

Accepted Answer

chromatography

Answer

sedimentation

Answer

crystallization

Answer

sublimation

Question 9

In the process of evaporation, which one of the following pieces of laboratory apparatus would NOT be used?

Accepted Answer

filter funnel

Answer

bunsen burner

Answer

evaporating basin

Answer

wire gauze

Question 10

Salt and water in seawater can be separated using these two stages:

Accepted Answer

distillation followed by evaporation

Answer

evaporation followed by filtration

Answer

distillation followed by decanting

Answer

filtration followed by evaporation

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