The Three States of Matter

1.) In solids, there are strong forces of attraction between particles, which holds them close together in fixed positions to form a very regular lattice arangement. 

2.) The particles don't move from their positions, so all solids keep a definite shape and volume, and don't flow like liquids. 

3.) The particles vibrate about their positions - the hotter the solid becomes, the more they vibrate (causing solids to expand slightly when heated).

1.) In liquids, there is a weak force of attraction between the particles. They're randomly arranged and free to move past each other, but they tend to stick closely together.

2.) Liquids have a definite volume but don't keep a definite shape, and will flow to fill the bottom of a container.

3.) The particles are constanly, moving with random motion. The hotter the liquids gets, the faster they move. This casues liquids to expand slightly when heated. 

1.) In gases, the force of attraction between the particles is very weak - they're free to move and are far apart. The particles in gases travel in straight lines. 

2.) Gases don't keep a definite shape or volume and will always fill any container. 

3.) The particles move constantly with random motion. The hotter the gas gets, the faster the move. Gases either expand when heated, or their pressure increases. 

1.) When a solid is heated, it's particles gain more enrgy.

2.)  This makes the particles vibrate more, which weakens the forces that hold the solid together. This makes the the solid expand. 

3.) At a certain temperature, the particles have enough energy to break free from their positions. This is called melting and the solid turns into a liquid.

4.) When a liquid is heated again the particles get even more energy.

5.) This energy makes the particles move faster, which weaknes and breaks the bonds holding the liquid together. 

6.) At a certain temperature, the particles have enough energy to break their bonds. This is called evaporating and the liqudis turns into a gas.