Changes

A famous saying goes “The only constant in the universe is change”

So how do you define a change? It is easy to observe one. A light changes from red to green, you change clothes, and seasons change. Changes happen everyday and all the time. But to define a change can be tricky.

First of all a change has to have two states of something. Meaning in the beginning you have something and that a change occurs and in the end you have something else. For example the light starts out as red, meaning stop, and then later it changes to green, meaning go.

So a change is defined as an occurrence in time where a state or object starts out one way and then ends up in another way.

In chemistry there are two major types of changes, physical change and chemical change. In all cases it has something start out in one way and ends up in another way.

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	Physical Changes Chemical Changes