CHEMISTRY DEPARTMENT

WAID ACADEMY

Standard Grade

Topic 1

Approximately how many chemical elements are there?

1. About 50.

2. About 80.

3. About 100.

4. About 150. 0%0%0%0%

About 50. About 80. About 100. About 150.

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What is formed when two or more substances come together without reacting?

1. A compound.

2. A mixture.

3. An element.

4. A solution. 0%0%0%0%

A compound. A mixture. An element. A solution.

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Which line shows something that always happens in a chemical reaction?

1. A gas is given off.

2. Heat energy is absorbed.

3. A colour change occurs.

4. A new substance is formed.

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A gas is given off. Heat energy is absorbed.

A colour change occurs. A new substance is formed.

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In a precipitation reaction

1. two solutions are mixed and a gas is given off.

2. two solutions are mixed and there is a colour change.

3. two solutions are mixed and heat energy is given out.

4. two solutions are mixed and an insoluble solid is formed.

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two solutions are mixed and a gas is given off.

two solutions are mixed and there is a colour change.

two solutions are mixed and heat energy is given out.

two solutions are mixed and an insoluble solid is formed.

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Which of following does not show a chemical reaction?

1. A match burning.

2. Water boiling in a kettle.

3. Frying an egg.

4. Glue setting. 0%0%0%0%

A match burning. Water boiling in a kettle.

Frying an egg. Glue setting.

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What is the symbol for caesium?

1. Cs

2. Cu

3. Co

4. Ca 0%0%0%0%

Cs Cu Co Ca

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The name given to a solid which dissolves in a liquid is the

1. solution.

2. solvent.

3. solute.

4. saturate. 0%0%0%0%

solution. solvent. solute. saturate.

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Which elements has the symbol Ca

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Carbon.. Caesium. Californium. Calcium.

1. Carbon..

2. Caesium.

3. Californium.

4. Calcium.

In an exothermic reaction

1. Heat energy is given out.

2. Heat energy is taken in.

3. A gas is given off.

4. A solid is formed. 0%0%0%0%

Heat energy is given out. Heat energy is taken in.

A gas is given off. A solid is formed.

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Which elements are present in sodium carbonate?

1. Carbon and sodium.

2. Sodium and oxygen.

3. Sodium, hydrogen and oxygen.

4. Sodium, carbon and oxygen.

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Carbon and sodium.

Sodium and oxygen.

Sodium, hydrogen and oxygen.

Sodium, carbon and oxygen.

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Which metal gives an orange-red flame colour.(You may wish to refer to page 4 of the data booklet)

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Calcium. Sodium. Copper. Potassium.

1. Calcium.

2. Sodium.

3. Copper.

4. Potassium.

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Which metal was discovered in the year 1775? (You may wish to refer to page 8 of the data booklet)

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Potassium. Magnesium. Zinc.. Calcium.

1. Potassium.

2. Magnesium.

3. Zinc..

4. Calcium.