Year 7 acids and alkalis

Which indicator can test for both acids and alkalis and provides a pH number of the substance being tested?

• Blue litmus paper

• universal indicator

• red litmus paper

Is blue litmus paper used to test for acids or alkalis?

• acids

• alkali's

• both

Is red litmus paper used to test for acids or alkalis?

• acids

• alkali's

• both

What pH number does a neutral substance have?

• 7

• 3

• 9

• 14

True or false:

A substance that is a weak acid would have a pH of 5-6.

• true

• false

True or false:

A substance that is a strong alkali would have a pH of 8-9.

• true

• false

Complete:

ACID + BASE --> ___ + ___

• metal salt + water

• metal salt + base

• metal salt + alkali

What term is used to describe an acid cancelling out an alkali?

• neutralisation

• mixing

• dilution

• concentrating

Complete:

ACID + METAL --> ___ + ___

• metal salt + hydrogen

• metal salt + carbon dioxide

• metal salt + oxygen

True or false:

The test for hydrogen gas is that it relights a glowing splint.

• true

• false