Question 1

Which of the following is a characteristic of a pure substance?

Accepted Answer

It has a uniform and definite composition.

Answer

It may contain varying proportions of different components.

Answer

It can be separated by physical means.

Answer

It has different properties in different samples.

Question 2

Which of the following is an example of a mixture?

Accepted Answer

Salad

Answer

Oxygen

Answer

Water

Answer

Gold

Question 3

What is a solution?

Accepted Answer

A homogeneous mixture of two or more substances.

Answer

A compound made of two elements

Answer

A physical change in matter

Answer

A type of pure substance

Question 4

Which of the following is NOT a characteristic of a mixture?

Accepted Answer

It has a fixed melting point.

Answer

It can contain varying amounts of components.

Answer

It can be separated by physical means.

Answer

It retains the properties of its individual substances.

Question 5

Which of the following statements about pure substances is true?

Accepted Answer

They cannot be separated into simpler substances by physical means.

Answer

They can be easily mixed with other substances.

Answer

They have variable compositions.

Answer

They display different properties in different samples.

Question 6

What best describes a heterogeneous mixture?

Accepted Answer

A mixture where the components are not uniformly distributed.

Answer

A mixture that has a uniform appearance throughout.

Answer

A mixture that cannot be separated by physical methods.

Answer

A mixture where all components are in a single phase.

Question 7

Which of the following is an example of a pure substance?

Accepted Answer

Distilled water

Answer

Air

Answer

Saltwater

Answer

Sand

Question 8

Which of the following mixtures is a colloid?

Accepted Answer

Milk

Answer

Sugar dissolved in water

Answer

Saltwater

Answer

Iron filings in sand

Question 9

What is an important feature of a compound compared to a mixture?

Accepted Answer

It has a fixed and definite chemical formula.

Answer

It consists of two or more elements mixed together.

Answer

It can be separated by filtration.

Answer

It retains the properties of its individual components.

Question 10

What happens to the properties of substances in a mixture?

Accepted Answer

The properties of the individual substances are retained.

Answer

The properties are combined into new properties.

Answer

Properties change to match the dominant substance.

Answer

One substance will disappear completely.

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