Question

2. Name the process which occurs when a drop of dettol is added to water
3. Give reason for the following observations.
(a) Which of the following diffuses faster among Water vapour, wax and ethyl alcohol
(b) We can get the smell of perfume sitting several meters away.
4. What happens when an inflated air balloon is pricked with a pin? Name the property of the gas exhibit
by this observation.
5. Ramesh took 2 beakers A and B containing hot water and cold water respectively. In cach beaker he
dropped a crystal of copper sulphate. After sometime what did he observe and why?
6 Identify the diffusion process that takes place in the following.
a) Swelling up of a raisin on keeping in water. b) Spreading of virus on sneezing.
c) Preserving pickles in salt. d) Spreading of smell of cake being baked throughout the house
e) Aquatic animals using oxygen dissolved in water during respiration
7. Suggest an activity to show that the rate of diffusion of liquids decreases with increase in density or
attraction forces between particles of the liquid.
8 Read the information from the table and answer the questions given below.
Name of the gas
Hydrogen (H2) Oxygen (0)
Methane (CH)
Carbon dioxide (CO2)
Molecular mass
2.
32
16
44
a) Which
gas
has least rate of diffusion?
b) In Oxygen and Carbon dioxide which gas spread easily?
c) Which gas diffuses rapidly. Why?
d) Arrange the gases in increasing order of diffusion rate.
9. Soda. Soft drinks (con colo)​

Answer 1

Answer:

2.When dettol is added to water, diffusion takes place.

3(a) Water vapour diffuses faster than ethyl alcohol or wax. Explanation: When the matters of two different types of particles of are intermixing on their own, this is called as diffusion.

(b)We can get the smell of perfume sitting several metres away. Perfume has a higher degree of vaporization and its vapour diffuse into the air easily. ... When perfume is sprayed, its particles diffuse into the particles of air at a very fast rateand reach our nostrils.