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