Tuesday
April 21, 2015

Homework Help: science

Posted by Bri on Monday, January 10, 2011 at 4:01pm.

here are some science questions I've been trying to do for over an hour and i just cant figure them out!
1.how does a fan convert energy?
2.what happens to matter during both a physical and chemical change?
3.give an example of a simple closed system
4. in a fire, why does the wood have less mass after the fire is done?

thanks! :)

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