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Name the two elements which are liquids at room temperature.

Mercury and bromine

Name an element which is a solid

at room temperature.

Iron, copper, zinc, potassium, tin, gold, silver

and many others.

Name an element which is a gas at room temperature.

Oxygen, nitrogen, fluorine, chlorine,

hydrogen

Are there more or less metals than non-metals?

There is more metals.

Give an example of a metal which was one of the first to be discovered

Gold, silver and copper

Which elements show similar chemical properties?

Elements in the same column

What is a compound?

Different atoms

joined together.

What does the ending -ide tell you about a compound?

2 elements joined together

What does the ending -ate/ite indicate about a compound?

Oxygen is present

What is a mixture?

Two or more substances not joined

together

What is the percentage of nitrogen and oxygen in air?

Nitrogen -80%

Oxygen -20%

What is the test for oxygen?

It relights a glowing splint

Why does air not give a positive test for oxygen?

There is not enough oxygen in the air.

What is a solution?

A solution is formed when a substance dissolves in a

liquid.

What term is used to describe a substance which dissolves in a

liquid?

Soluble

What term is used to describe a substance which does not

dissolves in a liquid?

Insoluble

What is a saturated solution?

A solution in which no more solid can be

dissolved.

Which has more substance dissolved in it a concentrated or

dilute solution?

Concentrated

How is a solution diluted?

Add more liquid(water)

Which gas is dissolved in drinks to make them fizzy?

Carbon dioxide gas

What is the test for carbon dioxide gas?

Turns limewater milky

Why is chlorine dissolved in drinking water?

To kill bacteria(germs)

Why is sodium fluoride dissolved in drinking water

To prevent tooth decay

What is the problem with lead compounds being present in

drinking water?

Harmful to health

What does this hazard warning symbol tell you?

Toxic or poisonous

What does this hazard warning symbol tell you?

Flammable / catches fire easily

What does this hazard warning symbol tell you?

Harmful or irritant

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