8Ea

1       Which of these things is an element?

A       salt                                 B       water

C       oxygen                           D      air

 

2       The number of chemical elements in the world is:

A       4.

B       about 100.

C       about 1000.

D       over a million.

 

3       The element that makes up most of the mass of your body is:

A       oxygen.

B       carbon.

C       calcium.

D       hydrogen.

 

4       Chemical elements:

A       are always solids.

B       are either solids or liquids.

C       are always gases.

D       can be solids, liquids or gases.

 

8Eb

1       Which of these metals is not a pure element?

A       gold

B       copper

C       silver

D       bronze

 

2       The smallest part of an element is called:

A       an atom.                         B       a molecule.

C       a compound.                  D      an ion.

 

3       An element is something that:

A       can be split up by a chemical reaction.

B       cannot be split up by a chemical reaction.

C       is made up of different kinds of atom.

D       is a mixture of atoms and molecules.

 

4       The correct way to write the chemical symbol for calcium is

A       CA                                 B       C

C       ca                                   D      Ca

 

8Ec

1       Which list only contains metals?

A       copper, gold, silver

B       copper, gold, sulphur

C       silver, oxygen, iodine

D       oxygen, iodine, sulphur

 

2       Which list contains three typical properties of metals?

A       good conductor of heat, brittle, low melting point

B       poor conductor of heat, strong, high melting point

C       good conductor of electricity, strong, high melting point

D       poor conductor of electricity, weak, low melting point

 

3       Which list contains three typical properties of non-metals?

A       good conductor of heat, brittle, low melting point

B       poor conductor of heat, strong, high melting point

C       good conductor of electricity, strong, high melting point

D       poor conductor of electricity, weak, low melting point

 

4       Where are metallic elements found in the Periodic Table?

A       on the right-hand side

B       on the left-hand side

C       in the top rows only

D       in the bottom rows only

 

8Ed

1       A compound contains:

A       only one type of atom.

B       only one element.

C       only two elements joined together.

D       at least two elements joined together.

 

2       The smallest particle of water with the formula H₂O is called:

A       an ion.

B       a molecule.

C       an element.

D       an atom.

 

3       The formula for sulphur dioxide is SO₂. Sulphur dioxide contains:

A       one atom of sulphur and one atom of oxygen.

B       two atoms of sulphur and two atoms of oxygen.

C       one atom of sulphur and two atoms of oxygen.

D       two atoms of sulphur and one atom of oxygen.

 

4       The formula of ammonia is NH₃. Which statement is true?

A       An atom of ammonia contains 4 molecules.

B       An atom of ammonia contains two different elements.

C       A molecule of ammonia contains 4 atoms.

D       A molecule of ammonia contains 4 different elements.

 

8Ee

1       The name of the compound that you get when magnesium burns in oxygen is:

A       magnesium oxide.

B       sodium chloride.

C       magnesium chloride.

D       sulphuric acid.

 

2       Water is an example of:

A       an element.

B       an atom.

C       a compound.

D       an alloy.

 

3       Which of these word equations is correct?

A       copper + oxygen ® copper sulphate

B       iron + chlorine ® iron oxide

C       aluminium + iodine ® aluminium iodide

D       sodium + sulphur ® sodium hydroxide

 

4       How many elements are there in the compound iron sulphide?

A       one

B       two

C       three

D       more than three