Question

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Every substance has a melting point and a boiling point. The former is the temperature ___ which it changes ___ solid ___ liquid. The latter is the temperature ___which it changes ___ liquid ___ gas. These changes are called changes ___state. Sometimes the properties ___ a substance change when it changes its state. ___ example, if the temperature ___ oxygen falls below -183 C, it changes ___ a colourless gas ___ a bluish liquid, which is highly magnetic.

Answer 1

Every substance has a melting point and a boiling point. The former is the temperature at which it changes from solid to liquid. The latter is the temperature at which it changes from liquid to gas. These changes are called changes of state. Sometimes the properties of a substance change when it changes its state. For example, if the temperature of oxygen falls below -183 C, it changes from a colourless gas to a bluish liquid, which is highly magnetic.