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What is matter made of?
Matter is made of particles.
Give one example of a solid, one liquid, and one gas.
Examples: solid – wood/metal/ice; liquid – water/juice/oil; gas – air/oxygen.
What is the difference between a material and a substance?
A material is what an object is made from; a substance is a pure material (not mixed).
Why can’t we see particles with our eyes?
Because particles are too small to see.
How are particles arranged in a solid?
Particles in a solid are packed tightly in a regular pattern.
How are particles arranged in a liquid?
Particles in a liquid are close together but not in a fixed pattern.
Why can liquids change shape easily?
Because the particles can slide past each other.
Why do solids keep their shape?
Because the particles are tightly packed and cannot move freely.
What happens to the particles of a solid when it is heated?
They gain energy and move faster; the solid may melt.
What is melting?
Melting is when a solid changes into a liquid by heating.
What is solidifying?
Solidifying is when a liquid changes into a solid by cooling.
Give one example of a solid that can melt.
Examples: ice, butter, chocolate, wax.
Give one example of a liquid that can solidify.
Examples: water to ice, melted wax to solid wax.
What do powders and liquids have in common?
Both can be poured.
Why can powders like flour be poured?
Powders are made of tiny grains with spaces between them, allowing them to flow.
When heating ice, what state changes take place?
Solid (ice) → liquid (water).
