Sunday, 19 May 2013

5.11 understand that, in car engines, the temperature reached is high enough to allow nitrogen and oxygen from air to react, forming nitrogen oxides

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The temperature in a car engine is high enough for nitrogen and oxygen from the air to react to form oxides of nitrogen. These oxides are al...

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

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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 no...

5.9 describe the trend in boiling point and viscosity of the main fractions

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The lower down the fraction, the higher the boiling point. The higher the boiling point, the lower the viscosity, the lower the boiling p...
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5.8 recall the names and uses of the main fractions obtained from crude oil: refinery gases, gasoline, kerosene, diesel, fuel oil and bitumen

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Uses of the products of the main fractions Refinery gases: bottles gas for camping etc. Gasoline: petrol for cars Kerosene: fuel for a...
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5.7 describe and explain how the industrial process of fractional distillation separates crude oil into fractions

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Fractional distillation Crude oil, as such, has no direct use. It has to be refined before it is any use. The first step in the refining o...
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5.6 understand that crude oil is a mixture of hydrocarbons

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Crude oil is a thick, sticky, black liquid that is found under the ground and under the sea in certain parts of the world such as he Middle ...

5.5 explain the uses of aluminium and iron, in terms of their properties.

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Uses of aluminium and iron Aluminium : aeroplane bodies: high strength-to-weight ratio overhead power cables: good conductor of elect...