Carmen P's answer to Ang Jia Xing's Secondary 3 Chemistry question.
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You can also check out this website to read more: http://www.bbc.co.uk/schools/gcsebitesize/science/add_aqa_pre_2011/chemreac/energychangesrev3.shtml
Date Posted:
7 years ago
thanks a lot! Your help is greatly appreciated :)
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