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Evaporation And Condensation Free Doubts and Solutions

CBSE - IX - Chemistry - Matter in Our Surroundings

give reason. the smell of hot seixxling food reaches you several metres away, but to get the smell from cold food you have to go close.  

Asked by siddheshpatil1187 16th June 2018, 2:35 PM
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CBSE - IX - Chemistry - Matter in Our Surroundings

how does an napthelon balls(moth)evaporates inside the cupborad, when our mom put's it with  our winter clothes in side, that insects may not come?

Asked by Sunny 13th May 2017, 11:22 AM
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CBSE - IX - Chemistry - Matter in Our Surroundings

Why does a desert cooler cools better on a hot dry day?

Asked by Topperlearning User 17th May 2016, 1:28 PM
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CBSE - IX - Chemistry - Matter in Our Surroundings

With the help of an activity show that rate of evaporation increases with the increase in surface area.

Asked by Virender 27th April 2016, 6:06 PM
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CBSE - IX - Chemistry - Matter in Our Surroundings

Explain why there is no increase in the level of water  when salt is dissolved in it.

Asked by Virender 27th April 2016, 6:03 PM
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CBSE - IX - Chemistry - Matter in Our Surroundings

Carbondioxide gas was taken in a cylinder and compressed by applying pressure-
a. Which state of matter is obtained after the completion of process.
b.Name the above process and name it.
c.What is the common name of the product obtained in the above process.

Asked by Virender 27th April 2016, 6:00 PM
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CBSE - IX - Chemistry - Matter in Our Surroundings

Which one of the following causes more severe burns -water at 100 degree celcius or steam at 100 C.

Asked by Virender 27th April 2016, 5:56 PM
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CBSE - IX - Chemistry - Matter in Our Surroundings

Doctors advice to put strips of wet cloth on the forehead of person having high fever. Why?

Asked by Virender 25th April 2016, 8:59 PM
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CBSE - IX - Chemistry - Matter in Our Surroundings

Why do people sprinkle water on roof after hot summer day?

Asked by Virender 25th April 2016, 8:56 PM
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CBSE - IX - Chemistry - Matter in Our Surroundings

Latent heat of vaporisation of two liquids A and B are 100J/Kg and 150J/Kg respectively.Which can produce more cooling effect and why? 

Asked by Virender 12th April 2016, 8:18 PM
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CBSE - IX - Chemistry - Matter in Our Surroundings

  Differentiate between evaporation and boiling.  

Asked by Topperlearning User 5th April 2016, 12:43 PM
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CBSE - IX - Chemistry - Matter in Our Surroundings

How does evaporation cause cooling?

Asked by Topperlearning User 5th April 2016, 12:40 PM
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CBSE - IX - Chemistry - Matter in Our Surroundings

Why does a desert cooler cool better on a hot dry day?

Asked by Topperlearning User 5th April 2016, 12:38 PM
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CBSE - IX - Chemistry - Matter in Our Surroundings

Before an injection, the nurse applies spirit at the site. How does one feel?

Asked by Topperlearning User 5th April 2016, 12:37 PM
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CBSE - IX - Chemistry - Matter in Our Surroundings

(a) What happens when a liquid is left exposed to air? (b) List the factors which affect the rate of evaporation and explain their effect on it.

Asked by Topperlearning User 5th April 2016, 12:35 PM
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CBSE - IX - Chemistry - Matter in Our Surroundings

Butter is generally wrapped in wet cloth during summers if no refrigerator is available. Explain.

Asked by Topperlearning User 5th April 2016, 12:33 PM
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CBSE - IX - Chemistry - Matter in Our Surroundings

How will you demonstrate that water vapour is present in air?

Asked by Topperlearning User 5th April 2016, 12:31 PM
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CBSE - IX - Chemistry - Matter in Our Surroundings

How does the following affect the rate of vaporisation of a liquid? (a)Surface area (b)Temperature (c)Humidity  

Asked by Topperlearning User 5th April 2016, 12:29 PM
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CBSE - IX - Chemistry - Matter in Our Surroundings

Give reasons for the following: (i)After rain, wet roads dry up quickly. (ii)In summers, we feel cool and comfortable while seating under a fan. (iii)Doctors advise to put strips of wet cloth on the forehead of a person having high temperature. (2 Marks each)  

Asked by Topperlearning User 5th April 2016, 12:28 PM
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CBSE - IX - Chemistry - Matter in Our Surroundings

(a)What happens when acetone is poured on the palm? (b) Water kept in an earthen pot becomes cool in summer. (c) We are able to sip hot tea from a saucer rather than from a cup.  

Asked by Topperlearning User 5th April 2016, 12:27 PM
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CBSE - IX - Chemistry - Matter in Our Surroundings

Give reasons: (a) Water droplets appear on the outer surface of a tumbler containing ice cold water. (b) People prefer to wear cotton clothes in summer. (c) On a hot sunny day, people sprinkle water on the roof or open ground.  

Asked by Topperlearning User 5th April 2016, 12:26 PM
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CBSE - IX - Chemistry - Matter in Our Surroundings

How does wind speed affect the rate of evaporation? Elaborate.

Asked by Topperlearning User 5th April 2016, 11:08 AM
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CBSE - IX - Chemistry - Matter in Our Surroundings

How can plasma be made on the Earth?

Asked by Topperlearning User 5th April 2016, 11:07 AM
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CBSE - IX - Chemistry - Matter in Our Surroundings

Why is evaporation called a surface phenomena?

Asked by Topperlearning User 5th April 2016, 10:50 AM
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CBSE - IX - Chemistry - Matter in Our Surroundings

(a) What is meant by evaporation? (b) What is the basic requirement for evaporation to take place? (c) Why should the wet clothes be spread out while drying?  

Asked by Topperlearning User 5th April 2016, 10:50 AM
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CBSE - IX - Chemistry - Matter in Our Surroundings

if you provided with some vegetables to cook .she aaddead salt into the vegetables during cooking process .after adding salt ,vegetables realesed water .what mechanism could be responsible for this
 

Asked by amanansuresh 25th September 2015, 9:03 PM
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CBSE - IX - Chemistry - Matter in Our Surroundings

how can we explain evaporation (to get 5marks)

Asked by satjorabazar 12th September 2015, 9:31 PM
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CBSE - IX - Chemistry - Matter in Our Surroundings

is desert cooler can be used in our daily life why?

Asked by Petulla Mishra 16th July 2015, 11:57 AM
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CBSE - IX - Chemistry - Matter in Our Surroundings

Would you cool a bucket of water more quickly by placing it on ice or by placing ice on it? Why?

Asked by Jerlin George 4th September 2014, 1:14 AM
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CBSE - IX - Chemistry - Matter in Our Surroundings

why do we find tiny water droplets on the glass when cold water is poured in it.

Asked by johncarter236 9th May 2014, 8:19 AM
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CBSE - IX - Chemistry - Matter in Our Surroundings

How does the perspiration or sweating help keep our body cool on a hot day?

Asked by Topperlearning User 6th May 2014, 1:50 PM
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CBSE - IX - Chemistry - Matter in Our Surroundings

Give one point of difference between condensation and freezing.

Asked by Topperlearning User 6th May 2014, 1:49 PM
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CBSE - IX - Chemistry - Matter in Our Surroundings

Why should we wear cotton clothes in summer?

Asked by Topperlearning User 6th May 2014, 1:48 PM
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CBSE - IX - Chemistry - Matter in Our Surroundings

How does evaporation cause cooling?

Asked by Topperlearning User 6th May 2014, 1:45 PM
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CBSE - IX - Chemistry - Matter in Our Surroundings

When is the air said to be damp or dry? What happens to the humidity in such conditions?

Asked by Topperlearning User 6th May 2014, 1:45 PM
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CBSE - IX - Chemistry - Matter in Our Surroundings

What will happen to the size of rain water puddles in a hot sunny day?

Asked by Topperlearning User 6th May 2014, 1:44 PM
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CBSE - IX - Chemistry - Matter in Our Surroundings

Why does clothes dry up faster in an open ground than in a closed room?

Asked by Topperlearning User 6th May 2014, 1:44 PM
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CBSE - IX - Chemistry - Matter in Our Surroundings

Why clothes take longer time to dry up in rainy weather than in a sunny day?

Asked by Topperlearning User 6th May 2014, 1:43 PM
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CBSE - IX - Chemistry - Matter in Our Surroundings

The rate of evaporation of a liquid increases on heating. Explain.

Asked by Topperlearning User 6th May 2014, 1:42 PM
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CBSE - IX - Chemistry - Matter in Our Surroundings

Why steam is more dangerous than boiling water?

Asked by Topperlearning User 6th May 2014, 1:42 PM
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CBSE - IX - Chemistry - Matter in Our Surroundings

List two differences between boiling and evaporation.

Asked by Topperlearning User 6th May 2014, 1:39 PM
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CBSE - IX - Chemistry - Matter in Our Surroundings

why is evaporation called a surface phenomenon

Asked by 20th April 2008, 1:06 PM
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CBSE - IX - Chemistry - Matter in Our Surroundings

why is evaporation called a surface phenomenon

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CBSE - IX - Chemistry - Matter in Our Surroundings

explain

Asked by 10th April 2008, 2:47 PM
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