Why Does the Temperature Remain Constant During the Melting of Ice Even Though Heat is Supplied Continuously ? - Science

Advertisements
Advertisements
Short Note

Why does the temperature remain constant during the melting of ice even though heat is supplied continuously ?

Advertisements

Solution

The temperature remains constant during the melting of ice because the heat supplied to the ice is used for changing the solid ice to liquid. The latent heat absorbed by the solid ice is used for breaking the inter-molecular force rather than increasing the temperature of ice.

  Is there an error in this question or solution?
Chapter 1: Matter in Our Surroundings - Very Short Answers [Page 36]

APPEARS IN

Lakhmir Singh Class 9 Chemistry - Science Part 2
Chapter 1 Matter in Our Surroundings
Very Short Answers | Q 27 | Page 36

Video TutorialsVIEW ALL [1]

RELATED QUESTIONS

Convert the following temperature to Celsius scale:- 300 K


What is the physical state of water at 250°C.


Convert the following temperatures to Kelvin scale.373°C


Name A, B, C, D, E and F in the following diagram showing change in its state.


What do you mean by the change of state? Write the flow chart showing the complete cycle of change of state.


Mention a change which is always


What do you observe when :

water is boiled


What do you observe when :

ime is dissolved in water.


State whether the following is physical or chemical changes.

heating of water —


Tick (√) the correct alternative from the choice given for the following statement.

When we add water to the following substances, which one will show a chemical change?


Tick the most appropriate answer.

Melting of ice is a


Tick the most appropriate answer.

Chemical changes involve


Dissolving salt in water is a reversible change.


Ripening of fruits is a desirable change.


Give an example of desirable change which can also be undesirable.


What is meant by saying that the latent heat of vaporisation of water is 22.5  × 105 J/kg ?


What is the chemical name of dry ice ?


Why does the temperature remain constant during the boiling of water even though heat is supplied continuously ?


Which contains more heat, 1 kg of water at 100° C or 1 kg of steam at 100° C ? Give reason for your answer.


Why does the temperature of a substance remain constant during the change of state ?


Explain why, naphthalene balls kept in stored clothes in our homes disappear over a period of time.


Match the following:

Column A Column B
(a) Evaporation of water (i) Non-periodic change
(b) Milk turning sour (ii) Periodic change
(c) Earthquake (iii) Chemical change
(d) Change of seasons (iv) Physical change
(e) Glowing of bulb (v) Reversible change

Define the following terms: Vaporisation


Define the following terms: Sublimation


Differentiate between: Miscible and immiscible liquids.


What happens to a metal ball when it is heated? What does this show?


Fill in the blanks:

Water boils at ______.


Name the phenomenon which causes the following changes:

Disappearance of camphor when exposed to air


Name the phenomenon which causes the following changes:

Conversion of ice into water


Explain the term freezing


Fill in the blank with the correct word Given below.

Cohesive forces are negligible in ____


State if the following is a physical property of a substance.

Naphthalene on heating directly turns into vapour.


In the paragraph below, write ‘solid’, ‘liquid’ or ‘gas’ in each of the brackets depending on the substance referred to just before.

On a bright sunny day, Riya and Gargi are playing with a ball ( ) in the park. Gargi feels thirsty. So, Riya brings tender coconut water ( ) for her. At the same time, a strong breeze ( ) starts blowing and it also begins to rain ( ). They run back into the house ( ), change their clothes ( ), and then their mother gives them a cup ( ) of hot milk ( ) to drink.


In the paragraph below, write ‘solid’, ‘liquid’ or ‘gas’ in each of the brackets depending on the substance referred to just before.

On a bright sunny day, Riya and Gargi are playing with a ball ( ) in the park. Gargi feels thirsty. So, Riya brings tender coconut water ( ) for her. At the same time, a strong breeze ( ) starts blowing and it also begins to rain ( ). They run back into the house ( ), change their clothes ( ), and then their mother gives them a cup ( ) of hot milk ( ) to drink.


Discuss.

Halima picks up a small stone from the ground and puts it in the water in a dish. Does the shape of the stone change?


Write the properties of this substance.

Water


What is it made from? Why?

A sickle to cut sugarcane.


What is it made from? Why?

The sheets used for roofing.


What will happen if....? And why?

A bell is made of wood.


Why does this happen?

Coconut oil thickens in winter.


Why does this happen?

Kerosene left open in a dish disappears.


Why does this happen?

What you see in the picture.


Photosynthesis is a natural process by which green plants manufacture food in the presence of sunlight.

Are any new products formed during the above process.


Photosynthesis is a natural process by which green plants manufacture food in the presence of sunlight.

Can the change be reversed or is it irreversible?


Fill in the blank with the appropriate word of the statement given below:

Change of milk of curd is a _______ change.


State whether the following statement is true or false. If false write the correct statement.

During physical changes, the composition of the original substance is not altered, but the properties of the original substance are altered.


State whether the following statement is true or false. If false write the correct statement.

During a chemical change the composition of the original substance is not altered and the change is irreversible.


Matter in any state is composed of small particles – molecules, atoms, or ions. Differentiate the terms above in Italics.


State which of the three states of matter Le. solids, liquids or gases – have

(a) No definite volume
(b) A definite shape
(c) High density
(d) No free surfaces
(e) Particles – which diffuse very easily.


Select the correct answer from A, B, C, D & E for the statement given below:

The state of matter which has ___________ least density & no free surfaces.


With reference to the liquid state of matter – answer the following

On heating, the liquid, do the particles gain or lose energy.


With reference to the liquid state of matter – answer the following

The heat energy supplied to the liquid is absorbed by its molecule & stored as which form of energy.


With reference to the liquid state of matter – answer the following

At what point will the particles become free and escape as a gas.


Give the reason for the following 

Solids cannot be compressed, but gases are highly compressible.


Give the reason for the following: 

The kinetic energy of molecules of gases is very large & of solids, the least.


Give the reason for the following 

On heating a sublimable solid, the molecules break free & escape from the surface of the solid directly into vapour.


Complete the blank with reference to interconversion of matter on the basis of kinetic theory-with the word ‘increase’, ‘decreases’, ‘gain’, ‘lose’, or ‘overcome’ in the following case.

During vaporization, the liquid particles ____________ energy.


Share
Notifications



      Forgot password?
Use app×