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September 22, 2014

Homework Help: Read Y9 chemistry (then anwer this)

Posted by Moira on Wednesday, September 10, 2008 at 11:04am.

2a) Someone finds teo bottles without labels. Both are white solids.
One of the white solids turns directly from a solid to a gas on heating. What is this type of change called?

b) The other solid turns yellow on heating. On cooling it turns white again. What might this solid be? (give it's name)?

c)Would you describe the effect of heat on the white powders as a physical change or a chemical change? Give one reason for your answer.

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