Matter in Our Surrounding_3

Latent heat is

• the heat absorbed or released at a boiling process during a change of phase

• the heat absorbed or released at a constant temperature during a change of phase

• the heat absorbed or released at a constant temperature during a change of phase of 1 kg object

• the heat absorbed or released by an object to increase or decrease its temperature by 1 degree Celcius

The heat absorbed by melting a solid is known as

• latent heat of fusion

• latent heat of solid

• latent heat of liquid

• latent heat of vaporisation

specific latent heat of vaporisation is

• the amount of heat required to change 1 kg of the substance from the solid to liquid phase without change in temperature

• the amount of heat required to change 1 kg of the substance from the liquid to gaseous phase without change in temperature

• the amount of heat required to change the temperature 1 kg of the substance by 1 degree Celcius

Specific latent heat of fusion is the quantity of _______________ that is absorbed during melting of 1 kg of a substance without any change in temperature.

When a solid reaches the temperatures of its ___, it can become a liquid.

• melting point
• freezing point
• boiling point
• density

When a liquid reaches the temperatures of its ___, it can become a gas.

• melting point
• freezing point
• boiling point
• density

Freezing point of water is

• 100 degrees Celsius
• 0 degrees Celcius
• 0 degrees Fahrenheit

The freezing and melting points of water are the same.

• True
• False

The temperature when a solid changes to a liquid - 

• melting point
• freezing point
• boiling point

What is the boiling point of water

• 0 C
• 100 F
• 50 C
• 100 C