Friday, December 2, 2011

Chapter 4 mixtures and pure substances


Today we are having a test in science. This unit has been about mixtures and pure substances. Mixtures occur when particles are brought close together, they do not chemically bond together, the different particles can be separated there are two kinds of mixtures.
A pure substance is a thing that has only one type of particle . Pure substances can be divided into two parts.

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