Acids and Alkalis

What colour does litmus paper turn when added to an alkali?

• Blue

• Red

• Green

• Colourless

What colour does litmus paper turn when added to an acid?

• Blue

• Red

• Green

• Colourless

What other laboratory substance can you use to test if colourless substance is an acid or an alkali?

• Catalyst

• Salt

• Universal Indicator

• Water

What happens to the pH of an acid during neutralisation?

• It stays the same

• It moves toward pH 1

• It moves towards pH 7

• It moves towards pH 14

A wasp sting is alkali. Which substance would neutralise the sting?

• Vinegar

• Bleach

• Baking soda

• Distilled water

Which substance is an acid?

• Water

• Bleach

• Orange juice

• Washing powder

Which pH levels indicated a strong acid?

• 1-3

• 4-6

• 8-11

• 12-14

Which pH level indicates a weak alkali?

• 1-3

• 4-6

• 8-11

• 12-14

Which pH level indicates a weak acid?

• 1-3

• 4-6

• 8-11

• 12-14

Which pH level indicates a strong alkali?

• 1-3

• 4-6

• 8-11

• 12-14