Acids & Alkalis KS3

Which of these is a group of chemicals that have a sour taste?

• Acids

• Alkalis

Which of these is a group of chemicals with a bitter taste, and commonly used in cleaning products?

• Acids

• Alkalis

A neutral substance is....

• Neither acid nor alkali

• a weak acid

• a weak alkali

• sour

Which of the following substances IS NOT an acid?

• Vinegar

• Lemonade

• Batteries

• Toothpaste

Which of the following substances IS NOT an alkali?

• Bleach

• Baking Soda

• Vinegar

• Oven Cleaner

Litmus paper is an indicator; it tells us if a substance is an acid or alkali.

When placed in an acid, BLUE litmus paper...

• will turn red

• will stay blue

When placed in an alkaline solution, RED litmus paper...

• Will stay red

• Will turn blue

The strength of an acid or alkali can be described using the pH scale.

A strong acid would be pH...

• 1

• 5

• 9

• 14

A strong alkali would be pH...

• 1

• 5

• 9

• 14

The attached hazard symbol means a substance is...

• Corrosive

• Explosive

• Toxic

• Harmful or an irritant