When a solid changes ____ to become a liquid we say it has ____. Melting happens when particles are given enough energy to move out of their fixed positions and to ____ over each other. You can make something melt by adding energy (usually in the form of ____ energy). Pure substances have a very ____ melting point. When we melt them, the temperature of the substance ____ at the melting point until all the particles have broken their ____ with each other and are moving freely. At this stage the temperature will start to go ____ again if you keep heating the substance. Since pure substances have a specific melting point, we can use the melting point to identify ____ substances, as well as to check their purity.

Summing up melting points

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