Change You Can Believe In --- By Nemo Jin, Sally Chen

Physical Change

Description:

---Physical changes occurs when the state of matter changes, or two substance physically combine together.

---No new substance is being produced.

Three states of matter:

Solid: 

        --Particles are packed together tightly. They can only vibrate within a certain area.

Liquid:

        --Particles can move around. The shape of a liquid is determined by its container. The volume of a liquid depends on temperature and pressure.

Gas:

        --Particles are able to move around freely at a high speed. They are separated with no regular shape.

Chemical Change

Description

-- New substances are being produced.

-- Changes in composition of a substance.

-- Color changes; odor changes;energy is released (light, heat)

-- Atoms are rearranged in chemical changes.

                                                          

Chemical Changes

Synthesis; is when simpler reactants combine together to make a compound. Ex; the picture below, showing that the N2 and 2O2 combine together to make 2NO2.

Combustion; is when only the atom arrangement changes. Ex; picture below only shows that the arrangement of the atoms changes. They didn’t break down or anything.

Decomposition; is when a reactant breaks into simpler reactants. Ex; picture at below, the 2H2O breaks into 2H2O + O2.  

Pictures provided by Fadhila Science-Stuff