6. Short-answer questions (50 words)
a. Which properties of gases and liquids are different? Describe them briefly.
b. Why do solids melt on heating? Explain with an example.
c. Why do gases change to liquids on cooling?
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Answers
Answer:
a.) Although a liquid can also take the shape of its container, a liquid doesn't change its volume without help. But a gas will always spread out to fill its container and, conversely, it can be compressed into a smaller container.
b.) When a solid is heated, the particles are given more energy and start to vibrate faster. At a certain temperature, the particles vibrate so much that their ordered structure breaks down. At this point the solid melts into liquid. ..
c.) All solids, liquids and gases are made of particles. The only difference between them is how much energy the particles have. ... Taking energy away from a gas (cooling it down) may cause it to turn into a liquid - or condense. Further cooling of the liquid may cause it to turn into a solid - or freeze
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