Unit 3 Revision

State whether the following statement is true or false.

Matter exists in nature only in two states: solid and liquid.

• True

• False

Complete the following sentence.

Through _____________ steam can be turned into liquid water.

• heating

• evaporation

• condensation

Which two of the following are reversible changes?

• ironing a shirt

• frying potato chips

• freezing green peas.

Is the corrosion of a nail irreversible or reversible?

• Reversible

• Irreversible

Is the following statement true or false?

If a matter undergoes an irreversible change, it cannot be changed back.

• True

• False

Complete the following sentence.

Reversible changes are _____________ changes.

• chemical

• physical

Is the following sentence true or false?

An irreversible change is a chemical change.

• True

• False

Is the given above a reversible or an irreversible change?

• Irreversible

• Reversible

What is a mixture?

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Which two of the following are mixtures?

• Tea

• Sugar

• Fruit salad

• Oxygen