Molecules & Matter- Changes Of State

Question 1

A pure substance has a specific _______ and _______ point.

Answer 1

A pure substance has a specific melting and boiling point.

Question 2

_______ occurs throughout a substance at its boiling point. ____________ occurs from
the surface of the liquid below the boiling point.

Answer 2

Boiling occurs throughout a substance at its boiling point. Evaporation occurs from
the surface of the liquid below the boiling point.

Question 3

Changes of state are ____ lines on a temperature time graph.

Answer 3

Changes of state are flat lines on a temperature time graph.

Question 4

Increasing the ___________ increases the internal energy and allows a substance to ______ _____.

Answer 4

Increasing the temperature increases the internal energy and allows a substance to change state.

Question 5

Specific latent heat of vaporisation is the amount of ______ needed to turn 1kg of a substance from ______ to a ___.

Answer 5

Specific latent heat of vaporisation is the amount of energy needed to turn 1kg of a substance from liquid to a gas.

Question 6

Specific latent heat of fusion is the amount of ______ need to turn 1kg of a substance from a _____ to a ______.

Answer 6

Specific latent heat of fusion is the amount of energy need to turn 1kg of a substance from a solid to a liquid.

Question 7

does specific latent heat change the temperature

Answer 7

no

Question 8

what is the equation for working out the amount of energy needed for a substance to change state

Answer 8

mass x specific latent heat