Latent Heat and Specific Latent Heat

IMPORTANT

Latent Heat and Specific Latent Heat: Overview

This topic gives us a detail on the latent heat of fusion and vaporisation along with the specific latent heat. It also discusses the factors affecting the melting point and the boiling point with the activities.

Important Questions on Latent Heat and Specific Latent Heat

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How much heat is required to convert 10 g of ice at -5°C to water at 10°C? (Given specific heat of ice =0.5 cal g-1C-1, specific heat of water =1.0 cal g-1C-1, Latent heat of fusion =80 cal g-1)

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50 g of steam at 100° C is passed into a large block of ice at 0° C the mass of ice that melts is 

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What is the total heat energy present in one gram of water?

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Water and ice having equal masses are placed inside an insulated container. The initial temperatures of water and ice are 40°C and 0°C respectively. The equilibrium temperature of the system in degrees Celsius is close to (Note: take the specific heat of water =4000 J·kg-1·K-1; latent heat of fusion =300 kJ·kg-1 )

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Heat given (H) to a substance was plotted against rise in temperature (0). Which of the following parts of the graph, most correctly
depicts the latent heat of the substance?

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An electric heater raises the tempeature of 5000 g of a given liquid from 25oC to 31oC in 120 s. If the power of the heater is 1 KW, calculate:

(a) the heat capacity of the liquid.

(b) the specific heat capacity of the liquid.

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IMPORTANT

25 g of ice at 0° C is added to 200 g of a liquid at 20° C. What will be the final temperature of the mixture when all the ice gets melted? The specific heat capacity of the liquid is 2.65 J g-1 °C-1, while that of water is 4.2 J g-1 °C-1. (Take, specific latent heat of fusion of ice = 336 J g-1)

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State the principle of method of mixture and what other name is given to it?

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Explain the electric method to calculate the specific latent heat of ice?

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The specific latent heat of vaporization of the water is 2260 × 103 J/kg.

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Will the value of specific latent heat of a substance change if the scale is °F instead of °C?

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The S.I. unit of specific latent heat is _____ kg-1.

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Explain the term ‘specific latent heat of fusion’ of a substance.

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What is specific latent heat of vaporization of a substance?

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What are the effects of Latent Heat of Fusion of Ice in Daily Life?

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Give two consequences of high latent heat of steam.

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Explain why if the ice at the top of the mountain never melts together completely.

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Heat (Q) is supplied to a solid to raise its temperature (T) across its melting point TM and boiling point TB. Which of the following graphs correctly represents the relation between heat supplied and temperature ?

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The specific latent heat of vaporisation for water is large.

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The correct reason behind cooling of a room after the water has been sprinkled is