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What are the three common states of matter?
Solid, liquid, gas
What is the smallest particle that still keeps the properties of an element?
Atom
In which state of matter are particles packed closest together?
Solid
What is the process called when a liquid changes into a gas?
Evaporation (or vaporisation)
Name one property of a liquid.
Takes the shape of its container / can flow / has a fixed volume
What happens to particles when a solid melts?
They gain energy and move further apart.
Which state of matter has no fixed shape or fixed volume?
Gas
Why can you smell perfume from across a room?
Diffusion – particles spread from high concentration to low concentration.
What is the process called when a gas changes directly into a liquid?
Condensation
Give one example of a physical change.
Melting ice, dissolving salt, tearing paper, boiling water
True or False: Particles in a solid do not move at all.
False (they vibrate in place)
What happens to particle movement when temperature increases?
Particles move faster.
Why are gases easy to compress?
There is lots of empty space between particles.
What is a mixture?
Two or more substances physically combined.
What state of matter is water at room temperature?
Liquid
A student leaves a puddle of water outside. After a few days it disappears. What process occurred?
Evaporation
