What is dry ice?
What is meant by “latent heat of vaporization of water is 22.5X10 kg"?
3. Why do solid not possess fluidity?
4. Water as ice has cooling effect whereas water as steam may cause severe burns
5. Osmosis is a special kind of diffusion comment.
6. Why do doctors advise to put strips of wet cloth on the forehead of a person ha
7. If pressure on a gas increased what will happen to inter particle forces?
8. A sample of water has a boiling point of 101.5°C at (latm) atmospheric pressure
(a) is water pure?
(b) will this water freeze at oºc?
9. Describe the inter conversion of three states of matter in terms of forces of attra
10. Why do we feel more comfortable under a fan when we perspire?
11. 36gm of Nacl is dissolved in 100g of water. Find its concentration.
12. Why does a true solution not show Tyndall effect?
13. Is repening of fruits is a chemical change?
14. Smoke and fog both are aerosol. In what way are they different.
15. Can we separate alcohol dissolved in water by using a separating funnel? De
16. Define unsaturated solution. Explain how can you change saturated into an
17. Define emulsion. Give its two examples.
18. Write differences between distillation and fractional distillation.
sugar required to sugar required to prepare its 10% solution
Answers
Answer:
don't you think that there are too many question in just one content
1.dry ice is nothing but solid carbon dioxide which shows sublimation when kept in air
3. the intermolecular attraction between the solids does not a lot the property of fluidity in solids
4.water as ice consists of latent heat of vaporization where as water in steam consists of latent heat of evaporation
5. the flow of matter from areas of lower concentration to areas of higher concentration through a semipermeable membrane is called osmosis it is different from diffusion in the sense that it is opposite to it
7. when the pressure in a closed vessel containing gas is increased then the intermolecular force of attraction between the molecules increases.
10. this wet present over the surface of our skin takes latent heat of evaporation from our skin and evaporates up does creating a cooling effect on our skin and hence we feel comfortable under fan in a hot sunny day
12. in a true solution the solute is present homogeneously throughout the solution does they do not show tyndall effect
13. yes, ripening of a fruit is a chemical change
15.no it's impossible to separate an alcohol from water through separating funnel because alcohol spreads evenly in water and hence they can be separated by the method of fractional distillation
16.an unsaturated solution is a solution in which even more moles or number of solute can be added to it.
these were some of the answer of the question which I knew