NT NWA1 Revision

Alkalis are a type of

• acid

• base

Vinegar is a type of

• acid

• base

• alkali

A solution with pH of 7 is considered

• acidic

• neutral

• alkaline

A solution's pH could be tested by

• blue or red litmus paper

• pH meter

• tasting it

• universal indicator

When a solution was tested with universal indicator, the indicator turned red. The solution is

• acidic

• neutral

• alkaline

When a solution with pH 13 was added to the universal indicator. What colour will you see?

• orange

• yellow

• green

• purple

acid + metal --> salt + ________ gas

Process where acid reacts with bases to form salt.

• neutralisation

• acidification

• carbonation

• bottling

________ are tiny organisms to small to see with the eye. They can cause bread to spoil

These are examples of microbes.

• Bacteria

• Mould

• Bread

• Milk