UNIT 2 PLANTS

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UNIT 1 ANIMALS

PENILAIAN UPSR

note of alkali and acid

Acids and alkalis

When a substance dissolves in water it makes a solution. Solutions can be sorted by whether they are: acid,alkali or neutral.

Acids and alkalis are corrosive. They eat into things. Acids have a sharp taste. Alkalis have a soapy feel. Neutral solutions are neither acid nor alkaline. Water is a neutral solution.

Alkalis

Many everyday substances are alkalis. They feel soapy. They are corrosive.

When the oxides of some metals dissolve in water they make an alkali solution.

Alkalis react with acids and neutralize them.

Acids

Many everyday substances are acids. They have a sour taste. They are corrosive.

When the oxide of some non-metals dissolve in water they make an acid.

Alkalis react with acids and neutralize them. Acids react with metals and carbonates.

Frog breathing

Butterfly Life Cycle

Acid and Alkali