Chemistry Level 5&6 Pre-Test (1)

Which of the following is an example of a reversible change?

• Burning wood

• Melting ice

• Cooking an egg

• Rusting iron

What happens to water when it freezes?

• It becomes a new substance

• It changes state from liquid to solid

• It dissolves

• It rusts

Which of the following changes is irreversible?

• Dissolving sugar in water

• Boiling water

• Baking a cake

• Melting chocolate

Rusting of iron is an example of:

• A reversible change

• A change of state

• A dissolving process

• An irreversible change

Which process can be reversed by cooling?

• Cooking pasta

• Freezing water

• Burning paper

• Rusting a nail

When salt is dissolved in water, what type of change occurs?

• Irreversible change

• Reversible change

• Chemical change

• Rusting

Which of the following is NOT a reversible change?

• Melting butter

• Freezing juice

• Boiling water

• Cooking rice

What is the main difference between reversible and irreversible changes?

• Reversible changes form new substances

• Irreversible changes can be undone

• Reversible changes can be undone

• Irreversible changes do not form new substances

Which of the following is an example of a reversible change involving water?

• Rusting of a metal

• Boiling water to form steam

• Burning a candle

• Cooking an egg

Which of the following changes involves the formation of a new substance?

• Dissolving sugar in tea

• Melting ice cream

• Baking bread

• Freezing orange juice