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| Question | Answer |
| Why is a fuel chosen? | A fuel is chosen because of its key features. |
| Name the 7 factors which are considered when choosing a fuel. | - energy value - availability - storage - cost - toxicity - pollution caused - ease of use |
| Why is the amount of fossil fuels being burnt increasing? | The amount of fossil fuels being burnt is increasing because populations are increasing. |
| Why are governments concerned about this? | Governments are concerned because of the increasing carbon dioxide emissions that result when fossil fuels are burned. |
| What have many governments pledged to do? | Many governments have pledged to try to cut carbon dioxide emissions over the next 15-20 years. (It is a global problem which cannot be solved by one country alone). |
| What does burning hydrocarbon fuels in plenty of air produce? | Burning hydrocarbon fuels in plenty of air produces carbon dioxide and water. |
| Write a word equation for this using methane as the hydrocarbon. | methane + oxygen > carbon dioxide + water |
| This can be shown using an experiment in the laboratory. Draw a labelled diagram of this experiment. |
Image:
combustion.gif (image/gif)
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| Describe what is happening in this experiment. | The candle is burnt; products passed through test regents; if positive carbon dioxide and water are formed. |
| When does complete combustion occur? | Complete combustion occurs when a fuel burns in plenty of oxygen. |
| Name one advantage of complete combustion over incomplete combustion. | More energy is released during complete combustion than during incomplete combustion. |
| What else is made during incomplete combustion? | Toxic gas (carbon monoxide) and soot (carbon) is made during incomplete combustion. |
| What are the two word equations for incomplete combustion? | fuel + oxygen > carbon monoxide + water OR fuel + oxygen > carbon + water |
| Given the molecular formula of a hydrocarbon, what can be constructed? | Given the molecular formula of a hydrocarbon, balanced symbol equations can be constructed. |
| Give the balanced symbol equation for the complete combustion of methane. | CH4 + 2O2 > CO2 + 2H2O |
| Give the two balanced symbol equations for the incomplete combustion of methane. | 2CH4 + 3O2 > 2CO + 4H2O or CH4 + O2 > C + 2H2O |
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