Chemical Changes
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Thermal Decomposition
A single substance is broken down by heating. A good example of this is the cracking of hydrocarbons.
Displacement
When one more reactive element pushes another less reactive element out of a compound. This mainly occurs with metals.
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e.g. Magnesium + Iron Sulphate ----> Magnesium Sulphate + Iron
Neutralisation
An acid and an alkali react to form a neutral product
Precipitation
A solid (the precipitate) is formed from the reaction of two solutions (i.e. no solids present at beginning of reaction)
Exothermic Reactions
A reaction that GIVES OUT heat. (e.g. combustion of fuels)
Endothermic Reactions
A reaction that TAKES IN heat. This energy is used to form the bonds needed to gain the products.
Reduction
The GAIN of electrons. This is the opposite to oxidation.
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e.g. Iron oxide ----> Iron
Oxidation
The LOSS of electrons. This is the opposite to reduction.
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e.g. Iron + Oxygen ----> Iron Oxide
Reversible Reactions
When the reaction goes "both ways". The conditions surrounding the
reaction determines which way the reaction favours i.e. more products
or more reactants formed. (e.g. The Haber Process in forming ammonia)
About the Author
by: Guest
Total views: 566
Word Count: 273
Date: Thu, 9 Aug 2007 Time: 12:00 AM
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