9Ha

1       A fuel is something that:

A       releases energy when it freezes.

B       takes in energy when it burns.

C       gives out energy when it burns.

D       gets hot on its own.

 

2       Charcoal is a fuel that is almost pure carbon. What is formed when charcoal burns?

A       carbon dioxide and oxygen

B       carbon dioxide and water

C       water and oxygen

D       just carbon dioxide

 

3       Why should burning fuels always be given plenty of air?

A       If there is not enough air, carbon dioxide may form.

B       The burning fuel needs carbon dioxide from the air.

C       Poisonous carbon monoxide may form if there is not enough oxygen.

D       The burning fuel will produce water.

 

4       Displacement reactions can be used to provide:

A       electrical energy.

B       heat energy.

C       light energy.

D       electrical energy or heat energy.

 

9Hb

1       Which of these reactions does not happen in living things?

A       respiration

B       combustion

C       photosynthesis

D       digestion

 

2       Which of these chemicals is made using chemical reactions in a factory?

A       glass

B       sugar

C       cotton

D       oxygen

 

3       New materials may be developed so that they:

A       are cheaper to make.

B       are more expensive.

C       take longer to make.

D       are more complicated to make.

 

4       A new drug has to be tested to:

A       see if it works.

B       make sure it does not harm people.

C       see if it works and to make sure it does no harm.

D       see how expensive it is.

9Hc

1       In a chemical reaction:

A       the masses of the reactants are always bigger than the masses of the products.

B       the masses of the reactants are always less than the masses of the products.

C       the masses of products and reactants are usually the same.

D       the masses of products and reactants are always the same.

 

2       If you burn a piece of coal, the mass of the ashes you have left is less than the original mass of the coal because:

A       carbon dioxide has been produced, which has escaped into the air.

B       carbon dioxide has been absorbed from the air.

C       oxygen has been produced.

D       water has been absorbed from the air.

 

3       If you heat a piece of copper, its mass goes up because:

A       it has reacted with oxygen from the air.

B       metals expand when they are hot.

C       heating metals produces carbon dioxide.

D       mass is conserved.

 

4       In a chemical reaction:

A       new atoms are created.

B       atoms are rearranged to form different substances.

C       atoms can be destroyed.

D       different atoms are made.

 

9Hd

1       Which of these fuels is not a hydrocarbon?

A       diesel

B       hydrogen

C       natural gas

D       petrol

 

2       When hydrocarbons burn they form:

A       hydrogen oxide only.

B       carbon dioxide only.

C       carbon dioxide and water.

D       smoke only.

 

3       If you burn 12 g of carbon in 32 g of oxygen, how much carbon dioxide will you get?

A       12 g

B       24 g

C       32 g

D       44 g

 

4       Phlogiston is:

A       an element that was discovered in 1772.

B       an old name for oxygen.

C       an imaginary substance that was thought to be taken in when things burned.

D       an imaginary substance that was thought to be given off when things burned.