Year 7 Final Chemistry Revision 1.1 - 1.7

What state of matter is the water in the image in?

• Solid

• Liquid

• Gas

• Plasma

Describe the state of liquid using the particle theory.

• The particles move in and out of each other.

• The forces of attraction are moderate.

• The shape is fixed.

• The particles are loosely arranged.

Compare the particles of a solid and gas

• Solid is widely separated while gas is closely arranged.

• The forces of attraction of a solid is strong but for a gas it is weak.

• Solids have a fixed shape but gas doesn't.

• Solids move fast in all directions while gases vibrate on the spot.

Why is gas easy to compress?

• The particles are not touching each other.

• The particles are touching each other.

• There are large spaces between the particles.

• There are tiny space between the particles.

What is the changes of state of condensation.

• Gas <- Liquid

• Solid -> Liquid

• Liquid -> Gas

• Gas -> Liquid

What is change of state of solid <- liquid called?

• Freezing

• Melting

• Condensation

• Boiling

Describe the process of freezing.

• The particles slowly move further apart.

• The forces of attraction gets stronger.

• The particles move very slow and start to vibrate on the spot.

• The forces of attraction get weaker.

What is the process of sublimation?

• Gas -> Solid

• Gas -> Liquid

• Liquid -> Solid

• Solid -> Gas

Give an example of an object that uses sublimation.

List the differences between boiling and evaporation.

• The process of boiling is quicker than evaporation

• Boiling happens at 100 $\degree C$ while evaportation happens at any temperature above 0 $\degree C$

• Boiling happens throughout the liquid while evaporation happens on the surface

• The process of boiling is slower than evaporation