sábado, 25 de septiembre de 2010


1. Phisical change: a change in size , shape , or state , without forming a new substance.

2. Chemical change: a change in matter that produces a new substance with different properties from the original.

3.Chemical reaction: a chemical change of original substances into one or more new substances.

4.Reactant: one of the original substances before a chemical reaction takes place.

5. Product: one of the new substances produced when a chemical reaction takes place.

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