Matter
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Title: Matter

Essay Details:

Subject: Science
Author: Patricia L
Date: June 11, 2011
Level: College
Grade: A
Length: 1 / 222

Essay text:

Chemical changes happen on a molecular level. When you step on a can and crush it, you have forced a physical change. The shape of the object has changed. It wasn't a change in the state of matter, but a change in shape. When you melt an ice cube, you have also forced a physical change by adding energy. That example caused a change in the state of matter. You can cause physical changes with forces like motion, temperature, and pressure. Chemical changes happen on a much smaller scale. While some experiments show obvious chemical changes such as a color change, most chemical changes happen between molecules and are unseen...

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