C4A: Physical and Chemical Properties
and Changes
C4B: Intensive and Extensive Properties
1
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C4A: Physical and Chemical Properties and Changes C4B, Study notes of Physical Chemistry
Change in state (water cycle):. Evaporation, condensation, melting, freezing, boiling, sublimation. - Change in size and shape:.
Typology: Study notes
2021/2022
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C4A: Physical and Chemical Properties
and Changes
C4B: Intensive and Extensive Properties
1
Physical Property
-^ can be
observed
or
measured
without
2
-^ can be
observed
or
measured
without
changing the substance’s composition.
- They can be used to identify substances.
Examples:
color, odor, mass, volume,density, boiling point, buoyancy, viscosity,solubility
Classify as physical property (PP) or
chemical property (CP)
Odor ____Density ____ solubility ____flammability ____
physical change
-^ does not alter the chemical identity of asubstance. No new substances are formed. __ You can often undo a physical change._ Examples: -^ Change in state (water cycle):
5
-^ Change in state (water cycle):
Evaporation, condensation, melting, freezing,boiling, sublimation
-^
Change in size and shape
tearing, drying clothes, pulverizing, dissolving,
Chemical Change
(chemical reaction)
-^ occurs when substance/s change into one or more different
substance/s.
-^
You can’t undo a chemical change.
-^
The substance before the change is called a reactant
-^
The substance after the change is called a product.
-^
The products have different physical and chemical
7
-^
The products have different physical and chemical properties from those of the reactants
Examples:
combustion, oxidation (rusting),
digestion, photosynthesis,reactivity
( metal reacting with acid)
Indicators of chemical change Presence of one or more of the following may
mean a chemical change.
* Change in
color
* Change in
odor
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* Formation of
gas bubbles
* Formation of
heat or change in temperature
* Formation of
precipitate
- a solid that forms
when two liquid solutions are^ mixed
Intensive property^ - depends on the nature/identity
of the substance.
- different amounts of the same substance have