Exploring Science edition © Pearson Education Limited 2008228

Name Class Date

7Fa(6) Reaction or no reaction? 1

1 In the sentences below, the words in italics are anagrams – the letters have been jumbled up.

Write out the correct words in the boxes.

When fi reworks go off, you see coloured thligs and hear loud bangs.

These changes show that chemical snoriacte are happening.

New busnatsces are always formed in a mechalic reaction.

Chemical changes are usually mantenrep changes.

It is usually very diffi cult to servere the nortiace in a chemical change.

When a chemical reaction happens, there may be a roclou change or a change in permteartue, and sometimes a sag is given off.

Not all changes are lichacme changes.

When ice stelm no new substances are formed.

This is a shlicpay change, because the tarew can be made back into ice quite easily.

2 Complete the table by ticking to say if a chemical reaction has taken place. Give a reason in each case.

Example Is it a chemical reaction? ( or )

Reason

If you put some water into a freezer, it turns to ice.

Bananas turn black if you leave them in a warm cupboard for a week.

Some baking powder from your kitchen fi zzes when you put it into vinegar.

When you boil water in a kettle, some of it turns to steam.

When you fry an egg, it turns white and goes solid.

I CAN... • describe what happens during a chemical reaction • identify changes as chemical reactions or physical changes.

7Fa

Unit06.indd 228 22/2/08 15:12:10