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Question 1

What is the name of the change from Gas to Solid?

Answer 1

Deposition.

Question 2

What is the name of the change from Solid to Gas?

Answer 2

Sublimation.

Question 3

What type of changes are state changes?

Answer 3

They are physical changes, which can be reversed, and the chemical properties of the substance do not change.

Question 4

What is a physical change?

Answer 4

A change in which no new substances are formed, such as a change of state.

Question 5

How are particles attracted to one another?

Answer 5

By weak forces of attraction.

Question 6

What happens to the weak forces of attraction during melting?

Answer 6

There are many weak forces of attraction in a solid. Some of these are overcome during melting. The remaining attractive forces between particles in a liquid are overcome during evaporating and boiling.

Question 7

What does it mean when the temperature stays constant (is flat) in a heating curve?

Answer 7

Solid–>Liquid: The temperature stays constant while the solid is melting. The substance is still being heated, but the added energy is making the particles break away from their fixed arrangement
Liquid–>Gas: The temperature stays constant while the liquid is boiling. The particles are escaping from the liquid to form a gas.

Question 8

How can you predict the state of a substance (if you know the temperature, melting point and boiling point)?

Answer 8

1. If it’s below the melting point, the substance is a solid.
2. If it’s between the melting point and boiling point, the substance is liquid.
3. If it’s above the melting point, the substance is a gas.