Rain that is acidic due to gases, such as sulfur dioxide, reacting with water vapour in the clouds. Sulfur dioxide is produced from the burning of fossil fuels which contain sulfur impurities.
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Alkanes
The most common hydrocarbon found in crude oil. Alkanes have the general formula Cn H2n+2.
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Alkenes
Alkenes are hydrocarbons with a double bond between two of the carbon atom chain, causing them to be unsaturated. They have a formula of Cn H2n.