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Changing MatterPhysical & Chemical Changes
Everything that you need to write down from this powerpoint is
underlined and in red!
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What’s the difference between Sean Combs and a comb??
We use properties!Properties are how we identify something.
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Matter has properties
Two basic types of properties that we can associate with matter.
Physical properties
Chemical properties
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Physical Properties
Anything that can be observed without changing the identity of the substance. (Tends to be measurable.)
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Chemical PropertiesThe way a substance may change or react to form other substances, requires a change of the substance and formation of a new substance
Example: Chemical reactions may cause a solid or liquid to form.
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Matter can be changed two ways
Physically Physical reaction
Physical change
Chemically Chemical reaction
Chemical change
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Physical Changes
Do NOT CHANGE THE TYPE OF MATTER
Nothing new or different is formedCould be a change in:
Mass Volume Density Change in state Color Shape
Size
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Examples of Physical Changes
Boiling – substance is merely changing temperatureFreezing Dissolving Breaking – just changing shapeMaking a mixture
2 or more types of matter (substances) mixed together Can be separated physically
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Chemical Changes
The composition of the substance changes.
The substances present at the beginning of the change are not present at the end; new substances are formed. The change cannot be “undone.”
Picture from www.chem4kids.com
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Chemical Changes
Evidence of a chemical reactionFormation of gas Formation of precipitate Change in color Change in energy
Endothermic Absorbs heat energy (gets cold) Exothermic Releases heat energy (gets hot)
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Chemical Changes
Atoms are re-arranged, NOT created or destroyed
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Law of Conservation of Mass
Mass is conserved amount of atoms cannot change
Nothing is created or destroyed