5.10 understand that incomplete combustion of fuels may produce carbon monoxide and explain that carbon monoxide is poisonous because it reduces the capacity of the blood to carry oxygen

Incomplete combustion of an alkane produces carbon monoxide. The same is true when petrol or diesel is burnt in cars, some of the fuel is not completely burnt because of the lack of oxygen.

The carbon monoxide produced passes out through the exhaust pipe of the car and gets into the atmosphere. This is potentially dangerous, since carbon monoxide is poisonous to humans as it reduces the capacity of the blood to carry oxygen.

2.26 describe the combustion of hydrogen

Combustion of hydrogen

Hydrogen burns when heated in the air or oxygen to form water.

The product will be formed initially as water vapour, but if cooled it can be condensed to form water.