1. Do solids diffuse ? What happens on heating them ?
2. Which property of gas is utilized when natural gas is compressed for vehicles ?
3. Why are the particles in liquid held together less firmly as compared to solids?
4. With the help of an example, explain how diffusion of gases in water is essential ?
5. Cotton is a solid but it floats on water. Why ?
6. Name and define the process involved in the following changes:
a) Liquid to Solid b) Gas to liquid
c) Solid to Gas d) Solid to Liquid
7. 2 mL of Dettol is added to a beaker containing 500 mL of water and stirred. State
four observations that you make.
8. With the help of an activity prove , that particles of matter are constantly moving ?
9. Arrange the following substances in the decreasing order of interparticle forces.
Hydrogen , salt, petroleum
10. The melting point of two solids X and Y are 300 K and 400 K respectively. Which
has more intermolecular forces. Give reason ?
SECTION B – BIOLOGY
1. Give one word answer for the following:
a) The intracellular source of digestive enzyme.
b) Structure found in plant cells but not in animal cells.
c) Structure found in animal cells but not in plant cells.
d) Organelle which is the storage sac of solid and liquid materials.
e) Organelle which serves as a channel for transport of materials between cytoplasm
and nucleus.
f) The only cell organelle seen in prokaryotic cell.
g) A cell organelle which is non-membranous.
2. There would be no plant life if chloroplasts did not exist. Justify.
3. What is cell sap? Give its composition.
4. How is bacterial cell different from onion peel?
5. In the given diagram:
(a) Identify the parts marked B and C.
(b) What are the substances that organelle A stores ?
Answers
Answer:
1.No , they turn into liquid
2. Property of commpressibilty
3. The spaces between the moluclues is more than compared to solids, hence the force is also low
4.fishes breathe underwater with help of diffusion, this diffusion is essential since the gas(oxygen) is dissolved in water in order for fishes to breathe.
5.cotton have minute pores from where the air gets in and cotton floats on water
6.a) Freezing
Freezing liquid allows it to form a solid hard shape due to low temperature
b) Condensation
Condensation also works on gases, the gas gets around a solid and stick to it and gets cooled down to change it self into liquid
ex: after boiling water when we keep it at room temperature some liquid surround the container due to Condensation of gas
c) Sublimation
this is the process where some substance get changed from solids to gas directly
ex: candle wax
freezed carbon
d) melting
when a solid gets heated it melts into liquid
ex: ice to water
iron ore to melted iron
Explanation:
sorry bro, u gave only 5 points this is too much.. mark me as brainliest pls I answered many this is as big as exam paper
hope it helps.. give heart and 5 star and brainliest pls bro..