What do th

ey

taste like?

What other things

taste similar?

What

do w

e

call t

hese

thin

gs?

Acids And Alkalis

LO

1. Recognise what acids and alkalis are

2. Identify acids and alkalis

What is an acid?Acids are a group of chemicals.

• Taste sour• If they are strong acids, they may sting when

you touch them. We call this CORROSIVE.

What is an alkali?Alkalis are a group of chemicals.

• Feel soapy. • If they are strong alkalis, they may burn the skin.

We call this CAUSTIC.

Neutral

AlkaliAcid

Some chemicals are not acids and not alkalis. We call these NEUTRAL.

Complete the acids and alkalis worksheet.

What are acids and Alkalis? True or false:

• Acids taste sweet.

• Alkalis feel soapy.

• Alkalis are caustic.

• Substances that are neither acid or alkali are called neutral.

• Fairy liquid is a weak acid.

• Lemon juice is a weak acid.

Corrosive / Caustic

•If you get any acid or alkali on your skin, wash it off straight away. •If you spill some, tell me. •Always wear goggles.

Indicators

Testing for acids and alkalisLitmus Phenolphthalein Methyl

Orange

Acid

Neutral

Alkali

Taboo

• Describe the word without saying the word.

• Hands up – no shouting out!

ACID

CORROSIVE

INDICATOR

ALKALI

SOAPY

NEUTRAL

SOUR