The Particle Theory

What is matter?

• anything that has mass

• anything that occupies space and has mass

• anything that takes up space

• anything that DOES NOT have matter or take up space

What are the states of matter?

• air, fire, gas

• solid, earth, water

• solid, liquid and gas

• solid, gas, compound

What are the characteristics of solid matter?

• takes the shape of any container

• molecules are packed tightly together

• have a definite shape and volume

• particles are free to move in all directions

Which describes liquid matter?

• particles are free to move in all directions

• particles can vibrate but do not move from their position

• no definite shape or volume

• particles are close together but are free to move past each other

Which description is correct for a gas?

• particles move around freely, not tightly packed, no specific volume or shape

• particles are close together but free to move past each other

• particles can vibrate but do not move from their position

Change of state is where material can change from one state of matter to another. There is no change in mass and no new substance is formed. which option includes all of the changes of state?

• melting, boiling, freezing and condensing

• boiling and condensing

• melting and freezing

takes place when a liquid is heated and turns into a gas

takes place when a solid is heated (gains energy) and it changes into a liquid

happens when a liquid is cooled and changes into a solid

is where cooling a gas (removing energy) causes it to change to a liquid