Anything that has weight and takes up space.

Describe how particles are arranged in a solid.

Particles in a solid are packed tightly together and do not move around much.

How does the arrangement of particles in a liquid differ from that of a solid?

In a liquid, there is more space between the particles, allowing them to slide around.

There is so much space between the constantly moving particles in a gas that you can move around in them easily.

I can create a model showing that matter is made of tiny particles too small to see.

1
Everything is made of matter, which is anything that has weight and takes up space.
2
Matter comes in three states: solid, liquid, or gas, depending on how the particles are arranged and move.
3
Matter can change states when its particles speed up or slow down, like when a solid candle melts into liquid wax or liquid water turns into gas (steam).