IGCSE
So if you record the temperature change during heating a solid, the temperature will first rise, then it will remain constant for a while (this is the melting point) and then it will rise again. The following figure is a heating curve of a solid. At point ‘A’ the state is …
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www.studyguide.pk IGCSE Complete Chemistry Notes
chemistry-igcse1.weebly.comPure substances and impurities A pure substance is a substance that has no particles of any other substance mixed with it. An unwanted substance, mixed with a wanted substance, is called an impurity To check if a substance is pure, you have to check its melting and boiling points.
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