In this question you will be assessed on using good English, organising information clearly and using specialist terms where appropriate. Most car engines use petrol as a fuel. • Petrol is produced from the fractional distillation of crude oil.  • Crude oil is a mixture of hydrocarbons. • Sulfur is an impurity in crude oil. Car engines could be developed to burn hydrogen as a fuel. • Hydrogen is produced from natural gas.  • Natural gas is mainly methane. Table 2 shows information about petrol and hydrogen. – 6158

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1. Advantages of using hydrogen
   Hydrogen is a clean fuel because when it burns, it only produces water, so there is no pollution.
   It doesn’t produce carbon dioxide, so it doesn’t cause global warming or climate change.
   It also doesn’t make sulfur dioxide, so it doesn’t cause acid rain.

   Petrol, on the other hand, can burn incompletely and make carbon monoxide (toxic) and particulates (which cause global dimming).
   Petrol is from a non-renewable resource, but hydrogen can be made from renewable sources.

   Hydrogen also gives more energy per unit of fuel, so less fuel is needed and it’s more efficient.

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