Define Density

State the equation and the correct units for calculating Density

Name the different states of matter in order of most dense to least

What is a solid?

What is a liquid?

What is a gas?

What is always conserved in when a substance changes state?

Define sublimation

Define evaporation

Define condensation

Define melting

Define freezing

Explain why a bathroom mists up

Define Density

Density is the mass per unit volume of a substance

State the equation and the correct units for calculating Density

Density (ρ/kgm⁻³)= Mass (m/kg) ÷ Volume (V/m³)

*you can use the equation to remember the definition

Name the different states of matter in order of most dense to least

Solid - Liquid - Gas

What is a solid?

• Each particle is connected to other particles in a regular arrangement.
• Particles only vibrate in place, they cannot leave there assigned space
• They occupy a set volume
• They are compact
• Low energy particles
• Strong intermolecular forces

What is a liquid?

• Each particle is connected to another particle in an irregular arrangement.
• They can flow over each other
• They can take the shape of the container without changing its volume
• They are close together but less dense than solids
• Medium energy particles
• Weaker intermolecular forces

What is a gas?

• Particles are not connected to each other
• Particles are free to flow anywhere
• They will take the shape and volume of the container
• Least dense
• High energy particles
• Weakest intermolecular forces

What is always conserved in when a substance changes state?

Mass is always conserved

Define sublimation

Solid to Gas (without passing the liquid stage)

Define evaporation

Liquid to Gas

Define condensation

Gas to Liquid

Define melting

Solid to Liquid

Define freezing

Liquid to Solid

Explain why a bathroom mists up

1. Hot water evaporates to water vapour
2. Water vapour attaches to the cold mirror
3. The water vapour condenses back to water on the surface of the mirror