Question

1) What happens when inated air balloon s pricked with a pince the property of the gaseous state exhibited by this observation.

2) Name or property which show by naphthalene and not by sodium chloride.

3) A Which of the following are matter Chair, air, love, smell, hate, almonds, thought, cold,
cold drink, smells of perfume .

4) Which of the following diffuses faster? Water vapour, wax or ethyl alcohol.

5) The room temperature is 25 degree Celsius. What is the corresponding temperature on the Kelvin scale?

6) Are the three states of matter interconvertible? How can they interconnect?

7) Why are we able to sip hot tea or milk faster from a saucer rather than a cup?

8) How does evaporation cause cooling ?

9) Comment on the following statements.

a. Evaporation causes cooling


b. Rate of evaporation of an aqueous solution decreases with increase in humidity.

c. Sponge though compressible is a solid.

d. Ice is solid at 0°C, while water is liquid at room temperature.

e. Sugar crystals dissolve faster in hot water than cold water.

10) Discuss the various factors which affect the rate of evaporation. Latent heat of evaporation of two liquids A and B is 100 Jkg and 150 J/kg respectively. Which one can produce more cooling effect and why?


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Answer 1

Answer:

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1. Answer: : The hole cannot allow so much air to come out at once. Explanation: The pressure inside the inflated balloon is much more than the atmospheric pressure When a pin is pricked,all the gaseous particles present in balloon intend to move from high pressure to low pressure,due to which the balloon burst
2. Answer:Sublimation is the property shown by naphthalene and not by sodium chloride. ... Sublimation is the process where a solid directly changes to the gas without the formation of the liquid.
3. The Only conditions for something to be matter are that it should occupy space and have mass. Matter can be solid liquid and gas. Solution: Chair, air, smell , almonds, cold drinks and smell of perfume are matter because they occupy space and have mass.
4. 1st water vapour will diffuse faster. then ethyl alcohol and then wax will diffuse faster. Water vapour diffuses faster than ethyl alcohol or wax
5. (a) We know,K=273+°C. Therefore, 25°C in Kelvin scale_K=273+25 =298(b)1. All matter is composed of atoms which have protons and electrons
6. Depending on the conditions of temperature and pressure, matter can exist in any of the three main states i.e., solid, liquid or gas. Matter can be inter-converted from one state to the other by the addition or removal of heat energy. All the three states of matter are inter-convertible.
7. Larger is the surface area more is the evaporation. Thus evaporation is faster in a saucer causing more cooling than in a cup. For this reason, we are able to sip hot tea or milk faster from a saucer than a cup.
8. By breaking their liquid bonds, they evaporate becoming a gas. ... The average energy of the liquid therefore decreases - in other words, the liquid cools down. This is why evaporation causes cooling - for example: You feel cooler when you get out of a swimming pool.
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10. Answer: Factors affecting the rate of evaporation: (a) Surface area: The rate of evaporation increases with increase in surface area. (b) Temperature: The rate of evaporation increases with increase in temperature.

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Answer 2

Explanation:

answer is given in the attachment