nd occupy the
1. Do solids expand on heating? Justify your statement with the help of an a
1. A substance that occupies space and has mass
matt
2. Building block of matter
atows
3. The state of matter in which particles move freely
of these
4. The space between two molecules
5. An example of a liquid
water
E Answer the following questions briefly,
these
1. Why is a molecule of oxygen written as 0,?
2. What is the difference between melting and freezing? -
3. What happens when a solid is heated? ILS
4. What happens to the particles when a gas is cooled? 126
5. What is expansion? 145
Answer the following questions.
solid and gas
e of these
densation
2. Explain what happens when 194
(a) a liquid is heated
(b) a liquid is cooled
ith the help of examples.
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