2.1 States of matter

Question 1

States of matter

Answer 1

There are three states of matter: solid, liquid and gas

In solids:
The particles are locked together and vibrate in a fixed position

In liquids:
The particles are touching, but not locked together and they move around each other

In gases:
The particles are spread out far away from each other and they move quickly in all directions.

Question 2

Melting and boiling points

Answer 2

At a substance’s melting point, it will begin to melt or will freeze if energy is transferred to the surroundings.

At a substance’s boiling point, it will begin to boil or condense depending on if energy is transferred to the particles or the surroundings.

A substance can evaporate if particles have high enough energy and leave the surface of the liquid.