Particle Model
What does the particle model say all matter is made up of?
Tiny particles.
Do solids have a fixed shape, volume, or both?
Both.
Do liquids have a fixed shape or volume?
Fixed volume but no fixed shape.
Do gases have a fixed shape or volume?
No.
Which state of matter always keeps its shape?
Solid.
In which state are particles closest together?
Solid.
Why can’t solids usually be compressed?
The particles are very close together.
Why can liquids flow?
Particles can slide past each other.
Why can gases be compressed easily?
Their particles are far apart.
Which two states of matter take the shape of their container?
Liquids and gases.
What gives particles their energy of movement?
Heat.
How do particles in solids move?
They vibrate in fixed positions.
Are liquids usually easy to compress?
No.
What happens when a gas is heated?
Particles move faster and spread out.
Which state of matter can be poured but not squashed easily?
Liquid.
True or False: Particles stop moving completely at room temperature.
False (they always move unless at absolute zero).
What property describes how some solids can be hammered into sheets?
Malleability.
What happens to particles when liquids are heated?
They move faster and spread out.
Why do gases fill any container they are in?
Particles move freely in all directions.
Which state of matter can be both poured and compressed?
Gas.
What holds particles together in a substance?
Attractive forces.
What property describes how some solids can be stretched into wires?
Ductility.
What happens when a liquid is cooled below its freezing point?
It becomes a solid.
What is the process of a gas changing directly into a liquid called?
Condensation.
Which two properties are used to compare solids, liquids, and gases?
Shape and volume.