Posted by Sara on Monday, March 22, 2010 at 7:21pm.
a is right. b is right. e is wrong.
c. mixing sand with soil. What different substance was formed? None, therefore, this a physical change. Same as adding water to a glass from the faucet.
d.This can be viewed two ways. If you are talking about the composting itself (that is, the act of composting) it is a physical change. That is no different than placing the morning newspaper in a chair or throwing it in the garbage bag. But if you are talking about what happens to the compost pile AFTER all of it has been mixed up, that is a decaying reaction and that is chemical.
e.Using a glue gun means pulling the trigger of the gun. That is a physical change. Same thing as opening the faucet to pour a glass of water.
Thanks for your great explanation, I am able to understand better, thank you:-)
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