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Natural Sciences 9 - 2025

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The following should be done during a thunderstorm

Take shelter under the nearest tree.

Lie flat on the ground with your arms and legs extended.

If you are in a car, roll up windows and stay in the car.

100%

Stay on the phone with a friend so you can ask her for help if necessary.

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Match the item on the left with the description on the right:

Symbol:

An electrical component that controls

the flow of current in one direction only.

A component that has a high resistance

against the flow of current. It is designed

to control current in a circuit accurately.

An adjustable resistor.

A material that can conduct an

electrical

current, offering little resistance against

the flow of charge.

Symbol:

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Match the term in Column A with the statement in Column B.

Electrolyte

Electric current

Electric cell

Ion

Salt bridge

Electrode

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Match the questions with the correct answers.

What does a cell consists of?

What is an electrolyte?

What type of energy does the electrolyte contain?

What is the input energy of an electric cell?

What is the type of energy that an electric cell outputs?

What is the source of energy in an electric current?

What is a measure of the amount of energy in a cell?

What are two cells in parallel called?

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acid is used to clean cement off bricks.

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Table salt

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acid is used to make fertiliser.

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Give the chemical formulae for the following:

The salt that forms when HCℓ and NaOH combine

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acid is used in plastics and explosives.

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