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When a substance changes from one phase to another, which of the following occurs?

the substance loses or gains heat

the average kenetic energy of the substance changes

the temperature of a substance changes

the molecular motion of a substance changes

  • chemisrty -

    You know 1 is true because of heat fusion and heat vaporization.
    You know 3 is not true since melting or boiling take place AT a particular temperature rather than through a particular range of temperatures.
    Look at the other two and see what you think.

  • chemisrty -

    It is the last one. I chose the 2nd one and got it wrong.

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