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Natural Sciences 9 - 2025

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Define the following terms as they are used in chemistry:

Products

Corrosive

Reactants

Neutralisation

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Identify the type of contact forces (friction, tension, compression).

Kneading bread dough

A clock wound up

Trying to squeeze into your jeans after lockdown

Rubbing both hands together to create heat.

Squeezing a lemon

A washing machine pushed along a floor.

Striking a match stick on a matchbox.

A mouse trap waiting to snap closed

Squashing marshmallows into a jar

A car towing another car with the help of a chain.

Crushing a coke can

An iron being pushed across material.

Skis sliding against snow.

A chord hanging from the ceiling with a light fitting on the end of it.

A stretched elastic band

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You have learnt that your stomach contains an acid called gastric acid. This acid helps with the digestion of food. Gastric acid contains hydrochloric acid and it has a pH of between 1,5 and 3. Sometimes after a meal you may experience a burning sensation

in your oesophagus which is called heartburn.

Is gastric acid a strong or a weak acid?

If you are suffering from heartburn, what could you take to alleviate the symptoms?

Does a pH of 1,5 indicate that the acid is strong or weak?

What is the word for what is done to a base when an acid is added to it?

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The following reactions are given:

A. H₂SO₄ + MgCO₃ = MgSO₄ + CO₂ + H₂O