CHEMISTRY DEPARTMENT

WAID ACADEMY

Unit 1

Susbstances

Approximately how many elements are there?

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About 50 About 80 About 100 About 125

1. About 50

2. About 80

3. About 100

4. About 125

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What is the symbol for the element sodium?

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S Si Se Na

1. S

2. Si

3. Se

4. Na

What is the name of the element which has the symbol Ca?

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Carbon Calcium Copper Caesium

1. Carbon

2. Calcium

3. Copper

4. Caesium

Which of the elements shown is a liquid at room temperature?

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Silicon Oxygen Magnesium Bromine

1. Silicon

2. Oxygen

3. Magnesium

4. Bromine

Which line shows three substances, all of which are gases at room temperature?

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Hydrogen, oxygen and helium.

Hydrogen, oxygen, and bromine.

Mercury, oxygen and sulphur.

Oxygen, nitrogen and bromine.

1. Hydrogen, oxygen and helium.

2. Hydrogen, oxygen, and bromine.

3. Mercury, oxygen and sulphur.

4. Oxygen, nitrogen and bromine.

Which of the elements shown is a non-metal?

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Potassium. Cobalt. Chromium. Phosphorus.

1. Potassium.

2. Cobalt.

3. Chromium.

4. Phosphorus.

Which line shows three elements which have been known for a very long time?

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uranium, americium and radium.

gold, silver and plutonium.

copper, silver and gold.

americium, gold and lead.

1. uranium, americium and radium.

2. gold, silver and plutonium.

3. copper, silver and gold.

4. americium, gold and lead.

Which line shows three elements which all belong to the Noble Gas group of elements?

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lithium, sodium and potassium

fluorine, chlorine and bromine

hydrogen, oxygen and nitrogen

helium, neon and argon

1. lithium, sodium and potassium

2. fluorine, chlorine and bromine

3. hydrogen, oxygen and nitrogen

4. helium, neon and argon

Which compound contains three elements, one of which is oxygen?

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sodium oxide sodium carbonate

sodium nitride sodium hydride

1. sodium oxide

2. sodium carbonate

3. sodium nitride

4. sodium hydride

A gas relights a glowing splint.Which gas is this?

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Oxygen Hydrogen Nitrogen Carbon dioxide

1. Oxygen

2. Hydrogen

3. Nitrogen

4. Carbon dioxide