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Calorimetry

Heat is added...

Question

Heat is added to ice initially at $0^{o} C$ until the ice changes completely into the water. The same amount of heat continues to be added to the liquid water for 15 minutes. Identify which of the following statement is true?

The temperature of the ice and water remains constant until the end of the 15-minute time period.

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The temperature of the ice rises steadily until all of the ice has melted into water.

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The temperature of the ice remains constant until all of the ice has melted into water, then the temperature of the water steadily rises for 15 minutes.

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The temperature of the ice rises from

0^{o} C

32^{o} C

, then the temperature of the water rise from

32^{o} C

100^{o} C

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The temperature of the ice remains at

0^{o} C

until the ice has melted, then the temperature of the water remains constant at

32^{o} C

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Solution

The correct option is C The temperature of the ice remains constant until all of the ice has melted into water, then the temperature of the water steadily rises for 15 minutes.
Temperature of the substance remains constant during its phase change whereas the temperature of substance increases when its is heated but keeping it in the same phase.
Thus temperature remains constant during melting of ice and after ice has melted completely, temperature of water thus formed rises for 15 minutes.

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Similar questions

Q. Ice at

0^{o} C

is added to

500 g

of water at

100^{o} C

degree. Ice is continually added to the system until it has all melted and no more ice will melt. What will be the temperature of the water in the system?

Q. A piece of ice of mass

40 g

0^{o} C

is added to

200 g

of water at

50^{\circ} C

. Calculate the final temperature of water when all the ice has melted. Specific heat capacity of water =

4200 J k g^{- 1} K^{- 1}

and specific latent heat of fusion of ice =

336 \times 10^{3} J k g^{- 1}

Q. Ice at

0^{\circ} C

is added to 200g of water initially at

70^{\circ} C

in a vacuum flask. When 50g of ice has been added and has all melted the temperature of the flask and contents is

40^{\circ} C

. When a further 80g of ice has been added and has all melted the temperature of the whole becomes

10^{\circ} C

. Find the latent heat of fusion of ice in cal/g.

Q. The temperature remains constant during melting and all the ice changes into water. The enthalpy change associated with this process is due to _____________.

Q. A certain amount of ice is supplied heat at a constant rate for 7 minutes. For the first one minute, the temperature rises uniformly with time. Then it remains constant for the next 4 minutes and again the temperature rises at a uniform rate for the last two minutes. Calculate the final temperature at the end of seven minutes in celsius (Given L of ice =

336 \times 10^{3}

J/kg and specific heat of water = 4200 J/kg - K)

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Heat is added to ice initially at 0oC until the ice changes completely into the water. The same amount of heat continues to be added to the liquid water for 15 minutes. Identify which of the following statement is true?

Heat is added to ice initially at $0^{o} C$ until the ice changes completely into the water. The same amount of heat continues to be added to the liquid water for 15 minutes. Identify which of the following statement is true?