A blog covering and explaining the Edexcel IGCSE Chemistry specification for the 2016 summer exams. If you are doing just double science, you do not need to learn the stuff for paper two, if you are doing triple you will need to learn all (GOOD LUCK!) I have separated the papers to make files easier to find. Hope it helps :)
1.17 understand the use of the term mole to represent the amount of substance
A mole is just the name given to a certain number. Much like 'a million' is 1,000,000; a mole is 6.023x10²³ One mole of any atom or molecule of any substance will have a mass (in grams) that is equal to the Ar (or Mr) or that substance.
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