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Evaporation Cooling By Evaporation Condensation Free Doubts and Solutions

CBSE - IX - Chemistry - Matter in Our Surroundings

Why 0°C can be solid as well as liquid ?

Asked by manasi_kulkarni3 21st April 2018, 11:03 PM
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CBSE - IX - Chemistry - Matter in Our Surroundings

Give two examples each of solid, liquid and gas mixed in liquid.

Asked by Topperlearning User 6th February 2018, 10:33 AM
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CBSE - IX - Chemistry - Matter in Our Surroundings

State four characteristics of solids.

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CBSE - IX - Chemistry - Matter in Our Surroundings

could you give me a clear information about the classification of matter
 

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CBSE - IX - Chemistry - Matter in Our Surroundings

what are porous solids?

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CBSE - IX - Chemistry - Matter in Our Surroundings

What is Brownian movement?

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CBSE - IX - Chemistry - Matter in Our Surroundings

Q1- Some people are sitting around a dinner table. When the lid of the dish was removed,all the people could smell the food . Identify the property of matter.
 
Q2- What is more effective in cooling , ice cubes or cold water? Why?
 

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CBSE - IX - Chemistry - Matter in Our Surroundings

What are the two more states of matter discovered? How are they obtained experimentally?

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CBSE - IX - Chemistry - Matter in Our Surroundings

With the help of a diagram explain in brief an activity to show that particles of matter are very small.

Asked by Topperlearning User 23rd March 2016, 11:39 AM
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CBSE - IX - Chemistry - Matter in Our Surroundings

List three characteristics of particles of matter. Describe one example for each characteristic to illustrate it. Name the characteristics which are responsible for (a) spreading of smell of scent in a room and (b) water taking shape of the vessel in which poured.

Asked by Topperlearning User 23rd March 2016, 11:38 AM
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CBSE - IX - Chemistry - Matter in Our Surroundings

Ice floats on water whereas a needle sinks. Explain.

Asked by Topperlearning User 23rd March 2016, 11:37 AM
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CBSE - IX - Chemistry - Matter in Our Surroundings

"We can easily move our hand in air, but not through any solid material." Justify the statement giving any three possible reasons.

Asked by Topperlearning User 23rd March 2016, 11:21 AM
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CBSE - IX - Chemistry - Matter in Our Surroundings

Give reasons for the following: (a)Water at room temperature is a liquid. (b)A gas cylinder cannot be half filled.  

Asked by Topperlearning User 23rd March 2016, 11:21 AM
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CBSE - IX - Chemistry - Matter in Our Surroundings

Explain the movement of molecules in frozen milk and milk at room temperature.

Asked by Topperlearning User 23rd March 2016, 11:20 AM
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CBSE - IX - Chemistry - Matter in Our Surroundings

What is the elementary constituent of matter?

Asked by Topperlearning User 23rd March 2016, 11:18 AM
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CBSE - IX - Chemistry - Matter in Our Surroundings

Stone is solid and so is sand and sugar. What is the difference?

Asked by Topperlearning User 23rd March 2016, 11:17 AM
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CBSE - IX - Chemistry - Matter in Our Surroundings

When we add salt to the water, where does the salt go?

Asked by Topperlearning User 23rd March 2016, 11:16 AM
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CBSE - IX - Chemistry - Matter in Our Surroundings

A rubber band changes its shape on stretching, then why is it called a solid?

Asked by Topperlearning User 23rd March 2016, 11:16 AM
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CBSE - IX - Chemistry - Matter in Our Surroundings

What are the basic characteristics of gases (any four)?

Asked by Topperlearning User 23rd March 2016, 11:14 AM
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CBSE - IX - Chemistry - Matter in Our Surroundings

Which of the two diffuses faster: a liquid or a gas?

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CBSE - IX - Chemistry - Matter in Our Surroundings

Why do solids show restricted movements?

Asked by Topperlearning User 23rd March 2016, 10:48 AM
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CBSE - IX - Chemistry - Matter in Our Surroundings

When sugar is added in a cup of tea, does the volume of tea increase?

Asked by Topperlearning User 23rd March 2016, 10:47 AM
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CBSE - IX - Chemistry - Matter in Our Surroundings

"The particles of matter are continuously moving". Explain this statement with an example.

Asked by Topperlearning User 23rd March 2016, 10:47 AM
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CBSE - IX - Chemistry - Matter in Our Surroundings

Compare in tabular form, the properties of Solids, Liquids and Gases with respect to: (i) Shape (ii) Volume (iii) Compressibility (iv) Diffusion (v) Fluidity or Rigidity  

Asked by Topperlearning User 23rd March 2016, 10:45 AM
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CBSE - IX - Chemistry - Matter in Our Surroundings

CO2 is a gas. Write its any two gaseous properties to justify it. How can we liquefy this gas? Solid CO2 is also known as dry ice. Why?

Asked by Topperlearning User 23rd March 2016, 10:42 AM
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CBSE - IX - Chemistry - Matter in Our Surroundings

(i) Explain the following properties of matter. (a) Fluidity (b) Density (ii) Why is the rate of diffusion is faster in gases?  

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CBSE - IX - Chemistry - Matter in Our Surroundings

(a) Differentiate between three states of matter on the basis of following properties. (i) Intermolecular forces. (ii) Arrangement of molecules. (b) Liquids generally have lower density compared to solids. But you must have observed that ice floats on water. Give reason.

Asked by Topperlearning User 23rd March 2016, 10:33 AM
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CBSE - IX - Chemistry - Matter in Our Surroundings

(a)How will you show the presence of water vapour in air? (b)Give the full form of (i) LPG (ii) CNG  

Asked by Topperlearning User 23rd March 2016, 10:29 AM
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CBSE - IX - Chemistry - Matter in Our Surroundings

Predict the physical state of matter in each from the following characteristics. (a)It has a definite volume but no definite shape. (b)It is rigid and highly incompressible. (c)Kinetic energy of particles is minimum in this state. (d)It represents the most highly compressible form of matter.

Asked by Topperlearning User 23rd March 2016, 10:28 AM
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CBSE - IX - Chemistry - Matter in Our Surroundings

Give reasons for the following: (a) Gases fill completely the vessel in which they are kept. (b) Gases exert pressure on the walls of the containing vessel.

Asked by Topperlearning User 23rd March 2016, 10:24 AM
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CBSE - IX - Chemistry - Matter in Our Surroundings

A gas jar containing air is upside down on a gas jar of bromine vapour. It is observed that after some time, the gas jar containing air also become completely reddish brown. (a) Explain why this happens. (b) Name the process involved.

Asked by Topperlearning User 23rd March 2016, 10:15 AM
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CBSE - IX - Chemistry - Matter in Our Surroundings

What is meant by relative density of a substance? The relative density of mercury is 13.6. What is its density in SI units? Given that the density of water is 1000 kg/m3.

Asked by Topperlearning User 23rd March 2016, 10:12 AM
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CBSE - IX - Chemistry - Matter in Our Surroundings

List the three states of matter. Which state of matter is rigid? Why?

Asked by Topperlearning User 23rd March 2016, 10:09 AM
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CBSE - IX - Chemistry - Matter in Our Surroundings

Mention two ways to liquefy atmospheric gases.

Asked by Topperlearning User 23rd March 2016, 9:48 AM
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CBSE - IX - Chemistry - Matter in Our Surroundings

Give reasons for the following: (a)A sponge is a solid but can be easily compressed. (b)Smell of perfume travels a few yards away.

Asked by Topperlearning User 23rd March 2016, 9:47 AM
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CBSE - IX - Chemistry - Matter in Our Surroundings

At what temperature does solid ice and liquid water co-exist together?

Asked by Topperlearning User 23rd March 2016, 9:44 AM
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CBSE - IX - Chemistry - Matter in Our Surroundings

What is the effect of the following on the rate of diffusion? (a)Temperature of liquid (b)Density of liquid

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CBSE - IX - Chemistry - Matter in Our Surroundings

Define matter. Name the state of matter in which the forces between the constituent particles are (i) Strongest (ii) Weakest.

Asked by Topperlearning User 23rd March 2016, 9:43 AM
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CBSE - IX - Chemistry - Matter in Our Surroundings

What is meant by particulate nature of matter? List any four characteristics of particles of matter.

Asked by Topperlearning User 23rd March 2016, 9:41 AM
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CBSE - IX - Chemistry - Matter in Our Surroundings

I WANT SOME IDEAS FOR A SCIEMCE EXIBITION A WORKING MODEL OR SOMETHING GOOD WHICH IS COST EFFECTIVE AND THE TOPIC IS ENVIRONMENT.SAVING OUR ENVIRONMENT
 

Asked by dinesh 29th October 2015, 8:20 PM
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CBSE - IX - Chemistry - Matter in Our Surroundings

How to prevent the process of sublimation? 

Asked by Smita 25th October 2015, 6:44 PM
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CBSE - IX - Chemistry - Matter in Our Surroundings

Prove  that  water ia s liquid  in room temperature? 
 
 

Asked by Parul 21st September 2015, 1:15 PM
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CBSE - IX - Chemistry - Matter in Our Surroundings

When egg white is mixed with water and stirred what does it form? Are we able to see path of light through it?

Asked by Kanhaiya 17th September 2015, 11:50 AM
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CBSE - IX - Chemistry - Matter in Our Surroundings

WHY BOILING IS CONSIDERED A BULK PHENOMENON?

Asked by Asmita 16th August 2015, 9:11 PM
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CBSE - IX - Chemistry - Matter in Our Surroundings

what are the five states of matter
 

Asked by smra129 25th July 2015, 2:23 PM
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CBSE - IX - Chemistry - Matter in Our Surroundings

plasma is a mixture of
-protons and neutrons
-free electrons and ions
-free radicals and ions
-free electrons only
(choose the correct option and explain it)

Asked by pahiroy1221 21st July 2015, 12:09 PM
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CBSE - IX - Chemistry - Matter in Our Surroundings

Is this correct to show that particles of matter are very very small-
we mix sugar in water and after stirring sugar gets mixed with the water. 
 

Asked by pahiroy1221 21st July 2015, 11:49 AM
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CBSE - IX - Chemistry - Matter in Our Surroundings

Account for the following: (a) An iron rod is solid at room temperature. (b) When sugar crystals dissolve in water, the level of water does not rise appreciably.

Asked by Topperlearning User 17th July 2015, 7:13 AM
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CBSE - IX - Chemistry - Matter in Our Surroundings

What are the basic characteristics of liquids?

Asked by Topperlearning User 17th July 2015, 7:13 AM
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CBSE - IX - Chemistry - Matter in Our Surroundings

after solid ,liquid,and gas if there is any other state

Asked by Geevarghese Daniel 21st May 2015, 4:33 PM
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CBSE - IX - Chemistry - Matter in Our Surroundings

why fishes can breathe when upper layer is freeze,although  oxygen cannnot pass through solid?

Asked by nisha_vini29 10th May 2015, 8:50 PM
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CBSE - IX - Chemistry - Matter in Our Surroundings

Can some liquids expand on cooling rather than contracting?

Asked by abhisekmohanty3399 6th February 2015, 8:26 PM
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CBSE - IX - Chemistry - Matter in Our Surroundings

wat is melting point

Asked by Krishna 29th July 2014, 6:33 PM
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CBSE - IX - Chemistry - Matter in Our Surroundings

Give five examples of matter and explain why?

Asked by Swarup Siji Singh 20th June 2014, 12:22 PM
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CBSE - IX - Chemistry - Matter in Our Surroundings

respected sir/madam,
i have a doutb that when we add potassium permanganate to water,it turns pinkish which shows that particles of matter are in motion then when we add sugar in water it doesnt appear to be moving at all?

Asked by vaidehipawar 22nd May 2014, 4:09 PM
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CBSE - IX - Chemistry - Matter in Our Surroundings

The Kelvin temperature of a substance is 370 K. What will be its corresponding Celsius scale temperature?

Asked by Topperlearning User 6th May 2014, 1:38 PM
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CBSE - IX - Chemistry - Matter in Our Surroundings

Convert the following temperatures to: (a) Celsius scale  (i) 313 K  (ii)370 K (b)Kelvin scale  (i) 23o C  (ii) 73oC

Asked by Topperlearning User 6th May 2014, 1:35 PM
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CBSE - IX - Chemistry - Matter in Our Surroundings

The boiling point of water is 100o C under normal atmospheric pressure. Convert this temperature in SI units.

Asked by Topperlearning User 6th May 2014, 1:30 PM
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CBSE - IX - Chemistry - Matter in Our Surroundings

Give two examples of compressed gases which we use in our daily lives. Give reason to support your answer.

Asked by Topperlearning User 6th May 2014, 12:13 PM
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CBSE - IX - Chemistry - Matter in Our Surroundings

Burning of an incense stick can be smelt from a distance. Why?

Asked by Topperlearning User 6th May 2014, 11:05 AM
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CBSE - IX - Chemistry - Matter in Our Surroundings

what do you mean by evaporation? why does evaporation cool a liquid?

Asked by 22nd April 2008, 8:40 PM
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CBSE - IX - Chemistry - Matter in Our Surroundings

Why does a poori swells when we heat it??

Asked by 19th April 2008, 1:24 PM
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CBSE - IX - Chemistry - Matter in Our Surroundings

why is evaporation called a surface phenomenon?

Asked by 16th April 2008, 7:12 PM
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CBSE - IX - Chemistry - Matter in Our Surroundings

difference between

Asked by Mansha 1st April 2008, 10:52 PM
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CBSE - IX - Chemistry - Matter in Our Surroundings

Differences between:-

Asked by Mansha 27th March 2008, 10:01 PM
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CBSE - IX - Chemistry - Matter in Our Surroundings

what is latent heat of vaporization?

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