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Types Of Changes Free Doubts and Solutions

CBSE - IX - Chemistry - Is Matter Around Us Pure?

How is fire extinguisher at airports and petrol pump

Asked by 464085213994624 15th February 2018, 9:10 PM
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CBSE - IX - Chemistry - Is Matter Around Us Pure?

The latent heat of vaporisation of water at 100degree Celsius is 540,find entropy increase when one mole of water at 100deg.cel is evaporate. 

Asked by amitjena226 4th February 2018, 10:30 AM
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CBSE - IX - Chemistry - Is Matter Around Us Pure?

Liquids generally have low density as compared to solids,but ice floats on water.why?

Asked by ABHILASHA 10th January 2018, 8:33 PM
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CBSE - IX - Chemistry - Is Matter Around Us Pure?

What is dry ice? How is it prepared?

Asked by Solar 4th January 2018, 10:23 PM
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CBSE - IX - Chemistry - Is Matter Around Us Pure?

what two precautions you would likely observe in the experiment to determine the mass percentaage og water imbided by the raisins and why?
 

Asked by amanansuresh 25th September 2015, 8:59 PM
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CBSE - IX - Chemistry - Is Matter Around Us Pure?

Is growing of hair a chemical or physical change?

Asked by Pratham 27th August 2015, 8:59 PM
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CBSE - IX - Chemistry - Is Matter Around Us Pure?

IF A CHILD IS SUFFERING FROM FEVER TO LOWER DOWN THE TEMPERATURE WE WILL USE ICE OR ICE COLD WATER AND WHY?
 

Asked by vijay.singh 25th September 2014, 10:06 PM
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CBSE - IX - Chemistry - Is Matter Around Us Pure?

WHY DO WE RUB THE MAGNESIUM RIBBON WITH A SAND PAPER BEFORE BURNING IT ?

Asked by sontakkevasundhara1 31st August 2014, 9:48 AM
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CBSE - IX - Chemistry - Is Matter Around Us Pure?

Explain how during the burning of a candle, both physical and chemical changes take place.

Asked by Topperlearning User 10th July 2014, 10:48 AM
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CBSE - IX - Chemistry - Is Matter Around Us Pure?

Classify the following into physical or chemical change: (I)Burning of a candle (II)Freezing of water (III)Mixing of iron filings and sand (IV)Fading of clothes

Asked by Topperlearning User 8th May 2014, 9:42 AM
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CBSE - IX - Chemistry - Is Matter Around Us Pure?

"The wool being knitted into a sweater is a physical change". Justify the statement.

Asked by Topperlearning User 8th May 2014, 9:41 AM
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CBSE - IX - Chemistry - Is Matter Around Us Pure?

Write any three differences between chemical change and physical change.

Asked by Topperlearning User 8th May 2014, 9:40 AM
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CBSE - IX - Chemistry - Is Matter Around Us Pure?

Classify the following as physical or chemical change: Cutting of vegetables, Rusting of almirah, Melting of ice, Spoiling of food

Asked by Topperlearning User 8th May 2014, 9:35 AM
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CBSE - IX - Chemistry - Is Matter Around Us Pure?

What type of change is 'cutting of trees'?

Asked by Topperlearning User 8th May 2014, 9:35 AM
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CBSE - IX - Chemistry - Is Matter Around Us Pure?

Explosion of a cracker is a chemical change. Explain.

Asked by Topperlearning User 8th May 2014, 9:34 AM
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CBSE - IX - Chemistry - Is Matter Around Us Pure?

What happens when a few drops of lemon juice are added to milk?

Asked by Topperlearning User 8th May 2014, 9:34 AM
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CBSE - IX - Chemistry - Is Matter Around Us Pure?

(a) Why is change in colour of a cut apple slice on being kept in air is a chemical change? (b) State one instance where water undergoes a physical change and one in which it undergoes a chemical change.

Asked by Topperlearning User 8th May 2014, 9:33 AM
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CBSE - IX - Chemistry - Is Matter Around Us Pure?

Describe what happens when we burn a piece of paper? What type of a change is this?

Asked by Topperlearning User 8th May 2014, 9:32 AM
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CBSE - IX - Chemistry - Is Matter Around Us Pure?

Out of physical and chemical change, which change is considered as a permanent change?

Asked by Topperlearning User 8th May 2014, 9:31 AM
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CBSE - IX - Chemistry - Is Matter Around Us Pure?

Why is digestion classified as a chemical change?

Asked by Topperlearning User 8th May 2014, 9:31 AM
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CBSE - IX - Chemistry - Is Matter Around Us Pure?

what are the three laws of chemical combination?

Asked by 2nd April 2008, 8:38 PM
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CBSE - IX - Chemistry - Is Matter Around Us Pure?

If the breaking of glass is irreversible , then how is it considered as a physical reaction?

Asked by 19th March 2008, 2:08 PM
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CBSE - IX - Chemistry - Is Matter Around Us Pure?

is tea a chemical change?

Asked by 7th March 2008, 3:04 PM
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