Sunday, October 2, 2011

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.
                                                          


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.  

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