Chapter 1: Matter in Our Surroundings
ONE WORD QUESTION
1) What is the SI unit of temperature?
2) What is the physical state of water at 100°C?
3) What is the term for change of solid directly into gas?
4) What is the process of gas changing into solid called?
5) What is the boiling points of water in kelvin?
6) What type of change is evaporation-surface or bulk?
7) Which state of matter has maximum kinetic energy?
8) What do we call the amount of heat needed to melt 1 kg of solid?
9) What is dry ice chemically known as?
10) Which state of matter is most compressible?
SHORT QUESTION
1) Why does the smell of perfume spread even without opening the bottle completely?
2) What are the characteristic of the particles of matter?
3) What causes a cooling effect during evaporation?
4) Why do naphthalene balls disappear over time?
5) Why does a gas fill the container completely?
6) What is the difference between boiling and evaporation?
7) Why do we wear cotton clothes in summer?
8) Why do we see water droplets on the outer surface of a cold glass?
LONG QUESTION
1) Describe the characteristics of the three states of matter with examples.
2) Explain interconversion of states of matter with the help of a labelled diagram.
3) Define and explain the factors affecting evaporation. How does evaporation cause cooling?
4) What is the role of temperature and pressure in changing the state of matter? Give examples.
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