736489
Descrição
FlashCards por x_clairey_x, atualizado more than 1 year ago
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Criado por x_clairey_x
mais de 10 anos atrás
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| Questão | Responda |
| What is in crude oil? | A mixture of many different compounds |
| What are alkanes? | Saturated hydrocarbons with the highest amount of hydrogen atoms as possible in their molecules |
| What is the general formula for alkanes? | C(n)H(2n+2) |
| How do we separate crude oil into fractions? | Using fractional distillation |
| What are the stages of fractional distillation? |
Image:
fractional_di (image/jpg)
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| What makes a fraction useful as a fuel? | Lighter fractions are more useful as fuels because they ignite easier and burn well with cleaner (less smoky) flames |
| What are the products of combustion when we burn fuels in a good supply of air? | The hydrogen and carbon in the fuel are completely oxidised and produce water and carbon dioxide |
| What happens if there are sulfur impurities in fuels? | They burn to form sulfur dioxide which can cause acid rain |
| What happens if we burn a fuel with insufficient oxygen? | We get poisonous carbon monoxide as well as particles of carbon(soot) and unburnt hydrocarbons |
| What happens when nitrogen reacts with oxygen at high temperatures in engines? | Nitrogen oxides are formed, these can cause breathing problems and acid rain. |
| Why is carbon dioxide called a greenhouse gas? | It absorbs energy which is lost by radiation from the surface of the Earth |
| What are biofuels? | A renewable source of energy that could be used to replace some fossil fuels |
| What can biodiesel be made from? | vegetable oils |
| Why is Ethanol a biofuel? | It can be made from sugar in plants |
| Name a potential fuel for the future | Hydrogen |
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