19.3 Change of State

Question 1

Define MELTING POINT

Answer 1

The temperature at which a pure substance melts at

Question 2

Define BOILING POINT

Answer 2

The temperature at which a pure liquid at atmospheric pressures boils

Question 3

Define SPECIFIC LATENT HEAT OF FUSION

Answer 3

The energy needed to change the state of 1kg of a solid to a liquid without changing the temperature of the substance

Question 4

Define SPECIFIC LATENT HEAT OF VAPORISATION

Answer 4

The energy needed to change the state of 1kg of a liquid to a gas without changing the temperature of the substance

Question 5

What happens when an object’s temperature when it changes state?

Answer 5

while the object is changing state the temperature of the object will be stable, however before/after the object has changed state the temperature rises uniformly