Question 1

What is a pure substance?

Accepted Answer

A material made up of only one type of particle.

Answer

A substance that varies in composition

Answer

A heterogeneous mixture

Answer

A combination of different substances

Question 2

Which of the following is an example of a mixture?

Accepted Answer

Salad

Answer

Oxygen

Answer

Salt

Answer

Water

Question 3

Which statement is true about pure substances and mixtures?

Accepted Answer

Pure substances have a uniform composition, while mixtures do not.

Answer

Pure substances can be separated by physical means

Answer

Mixtures are always solid

Answer

All substances are mixtures

Question 4

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

Accepted Answer

It has a fixed composition.

Answer

Its properties can vary

Answer

It can be made up of different substances

Answer

It can be separated by physical methods

Question 5

What is a common method used to separate components of a mixture?

Accepted Answer

Filtration

Answer

Evaporation

Answer

Condensation

Answer

Sublimation

Question 6

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

Accepted Answer

Distilled water

Answer

Ocean water

Answer

Air

Answer

Fruit salad

Question 7

What defines a heterogeneous mixture?

Accepted Answer

It contains visibly different substances or phases.

Answer

It contains only one type of atom.

Answer

It has a uniform composition throughout.

Answer

It cannot be separated by physical means.

Question 8

Which of the following mixtures can easily be separated by hand?

Accepted Answer

Trail mix

Answer

Ice cream

Answer

Saltwater

Answer

Sugar solution

Question 9

What is the main characteristic of a homogeneous mixture?

Accepted Answer

It has a consistent composition throughout.

Answer

It contains particles that are easily distinguishable

Answer

It consists only of one element

Answer

It can be solid or gas but never liquid

Question 10

What separates a compound from a mixture?

Accepted Answer

A compound is made of two or more elements chemically combined.

Answer

A mixture is always a solid

Answer

A compound has variable composition

Answer

A compound cannot be broken down

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