Advertisements
Advertisements
प्रश्न
Explain the following temperature vs time graph.
उत्तर
- During the heating of ice, the change in temperature with time is shown in the graph.
- Seg AB - Seg AB represents the conversion of ice into the water at a constant temperature. During the melting of ice at 0°C, ice absorbs heat energy and this continues till all the ice converts into water.
- Seg BC - Once all ice is transformed into water, the temperature of water starts rising it increases up to 100°C. Seg BC represents a rise in the temperature of water from 0°C to 100°C.
- Seg CD - Even though the heat energy is supplied to the water after 100°C its temperature does not rise. The heat energy absorbed by water is used to break the bonds between molecules of the liquid to convert it into a gaseous state.
APPEARS IN
संबंधित प्रश्न
State two characteristics of a good thermion emitter.
What is the Greenhouse effect?
Explain the meaning of the term latent heat. State its S. I. unit.
Give one consequence of the high specific latent heat of fusion of ice.
What observation you will record and how will you determine the specific latent heat of fusion of ice?
Steam at 100°C is passed over 1000 g of ice at 0°C. After some time, 600 g of ice at 0°C is left and 450 g of water at 0°C is formed. Calculate the specific latent heat of vaporization of steam (Given: specific heat capacity of water = 4200 J/kg°C, specific latent heat of fusion of ice = 336,000 J/kg.)
When ice is converted into water : constant temperature : : before the water evaporates : _______
Find the odd one out and give its explanation.
Define boiling point of a liquid.
Match the columns.
| Column A | Column B |
| 1) Specific latent heat of fusion | a) Air saturated with vapour |
| 2) Specific latent heat of vaporisation | b) Solid converts into liquid |
| 3) Dew point temperature | c) liquid converts into gas |
Match the columns.
| Column A | Column B |
| 1) Absolute humidity | a) J or cal |
| 2) Latent heat | b) J/kg °C |
| 3) Specific heat capacity | c) kJ/kg |
| 4) Heat | d) no unit |
| e) kg/m3 |
The latent heat of vaporisation is a term referred for the conversion of gas into liquid.
Write scientific reason.
Use a pressure cooker to cook food in cold air.
Define specific latent heat capacity
For the same mass of ice and ice-cold water, why does ice produce more cooling than ice-cold water?
600 g of copper at 50°C is mixed with lOOOg water at 20°C. Find the final temperature of the mixture. The specific heat capacity of copper is 0.4 Jg-1°C-1 and that of water is 4.2 Jg-1°C-1
Calculate the amount of heat required to convert 200g of ice at 0°C into the water at 0°C Specific latent heat of fusion of ice = 336 Jg-1
