Q4 of 19 Page 13

Is there any change in mass when a substance changes its state? Explain with example.

No. Mass is neither created nor destroyed.


Explanation: If I have 50grams of ice and I put it in a beaker I allow it to melt. The mass of liquid will be same i.e. 50grams.


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2

Name the characteristics of matter that are demonstrated by diffusion.

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"When sugar is dissolved in water there is no increase in volume". Is it true or false?

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Do all substances change from solid to liquid and liquid to gas on heating? Explain.

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Define the following terms:

a) melting point


b) boiling point


c) evaporation