2. MATTER  Where everything is made of and also matter is everything is around you also matter include atoms and particles also it is a substance of which all physical objects consists. Also matter is anything that has mass and occupies volume.

3. PARTICLES  Particles, liquid are close together but they can move and solids held very tightly together. Gases they are far apart and whizz about a lot.

4. PHYSICAL CHANGES  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.  Gas pressure is due to particles hitting the surface.  Diffusion is just particles spreading out.

5. CHEMICAL CHANGE  Chemical change are objects and substances but chemical change sometimes are particles of the original materials. For example, in the case of solutions like bubbles may not be necessarily be newly produced gas but instead water vapor so chemical change is nothing but a change which is usually irreversible.

6. COMPOUND  2 or more particles connected

7. MIXTURES  Particles and compounds are together but not connected.