Year 7 - States of Matter and Particles

What is meant by the particle model?

• A detailed representation of matter where particles are considered as complex structures with volume and forces acting between them.
• A theoretical model that suggests particles are constantly changing shape and size.
• A model that ignores the existence of particles in matter.
• All materials are made of billions of tiny pieces called particles

What does the term ‘substance’ mean?

• A type of animal
• A musical instrument
• A specific color
• A word that can be used to refer to any solid, liquid or gas.

How are particles arranged in a solid?

• Particles in a solid are far apart and move freely.
• Particles in a solid are closely packed together and vibrate in place.

• Particles in a solid are arranged in a linear fashion.
• Particles are arranged in a random pattern

What are the properties of a solid?

• Solids have indefinite shape and volume
• Particles in a solid are in a random shape and move around freely

• Fixed shape, particles can only vibrate

• Solids have particles that are loosely packed together

What are the properties of a liquid?

• Variable volume, takes the shape of its container, fixed mass
• Definite volume, takes the shape of its container, does not flow, fixed mass
• Definite volume, does not take the shape of its container, flows, fixed mass
• No fixed shape, particles move randomly

What are the properties of a gas?

• High density and definite shape
• Particles vibrate in a fixed position

• Particles independently move randomly throughout the container.

• Limited expansion and high density

Define freezing

• Freezing is the process in which a liquid turns into a gas

• Freezing is the process in which a solid turns into a liquid

• Freezing is the process in which a gas turns into a liquid

• Freezing is the process in which a liquid turns into a solid

Sublimation is when a solid turns straight away into a (a)  

What happens to particles as you heat them up?

• Particles remain unaffected by heat
• Particles gain potential energy and stop moving
• Particles lose mass and slow down
• Particles gain kinetic energy, move faster

What happens to the particles during boiling?

• Particles gain enough energy to transition from liquid to gas phase.
• Particles decrease in temperature.
• Particles freeze into a solid state.
• Particles disappear completely.