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Posted by on Aug 5, 2011 in General Chemistry | 0 comments

Survey of the Types of Chemical Reactions

Explosions are vigorous chemical reactions that take place very rapidly and produce large volumes of gas and a lot of heat. For the explosives shown here, all are solids or liquids with a small volume relative to the huge amount of gas that is released in the explosion. The rapid production of a large volume of gas causes damage.

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Posted by on Aug 3, 2011 in General Chemistry | 0 comments

Early models of the Atom

Once atoms were found, it became evident that atoms were composed of protons, neutrons and electrons. The first model, due to J.J. Thomson, was the plum pudding model. This suggested that the atom was a positively charged cloud with electrons floating in it. This model is incorrect.

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