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Introduction to Elements, Atoms, Molecules,
THE LANGUAGE OF CHEMISTRY
Types of Reactions : Combustion
A fuel is a chemical or a mixture of chemicals that burns in the oxygen gas in the air liberating thermal energy. Most fuels are fossil fuels, such as natural gas and petroleum. These are made of carbon compounds which originated from organisms that lived millions of years ago.
The products of combustion are carbon dioxide and water. The example below shows the gas methane burning in oxygen. Methane is found in natural gas.
Methane is a molecule made from the chemical bonding between one carbon atom and four hydrogen atoms. This reaction needs to be ignited before it will take place. Once ignited, however, the reaction produces a great deal of thermal energy.
Types of Reactions : Precipitate Reactions
In this type of reaction two solutions mixed together make one product which is insoluble. This product comes out of the solution and can be seen as a solid mass in the test tube.
In the reaction above sodium hydroxide solution is added to a solution of copper II nitrate. There are two products. Sodium nitrate is soluble and remains in solution. The copper II hydroxide, however, is insoluble and comes out of the solution. In this particular case the precipitate has a light blue colour.
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