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What’s the MATTER:Classify Changes of Matter
Matter, Classify Changes of Matter
At the conclusion of our time together, you should be able to:
1. Characterize various changes of matter2. Recognize that a change of state in
matter is a physical change
Interesting Signs:
PhysicalPhysical
Physical ChangePhysical Change
A change in matter from one form to another without changing its chemical properties
(most can be reversed)No change in atoms/molecules
Physical Change
Examples = Change in state or phase change Dissolving Compressing Light emission/absorption Electrons passing through metals
Physical Change
More Examples =
boiling of a liquid melting of a solid dissolving a solid in a
liquid to give a homogeneous mixture
making a solution
ChemicalChemical
Chemical ChangeChemical Change
Bonds are made / broken Change in oxidation states Bonds are made / broken Change in oxidation states
Cl-1 Cl-1
21
Li +1
Examples of Chemical Change
Chemical change or chemical reaction — transformation of one or more atoms or molecules into one or more different molecules.
• Burning hydrogen (H2) in oxygen (O2) gives H2O.
Sure Signs of a Chemical Change“Chemists Get Practice Trying Labs”
Color Change Gas Produced (not from
boiling!) Precipitate – a solid
formed by mixing two liquids together
Temperature Change Light
Will This be on the Test????
Remember the Law of Conservation of Mass
In a physical change or a chemical reaction, mass is neither created or destroyed
(Antoine Lavoisier)
Matter, Classify Changes of Matter
Let’s see if you can:
1. Characterize various changes of matter2. Recognize that a change of state in
matter is a physical change
Physical vs. Chemical Change
Examples:
melting
flame produced
paper cut
dissolving salt
in water
tarnishes in air
physical
chemical
physical
physical
chemical
Examples:
rusting iron
mixing mud and
water
burning a log
freezing water
grinding spices
Physical vs. Chemical Change
chemical
physical
chemical
physical
physical
A difference between physical change and chemical change is that
1. chemical change involves energy while physical change does not.
2. physical change involves energy while chemical change does not.
3. different kinds of molecules are present after a physical change but not after a chemical change.
4. different kinds of molecules are present after a chemical change but not after a physical change
In making a pizza, which process involves a chemical change?
1. Mixing spices for the sauce
2. Slicing pepperoni for the topping
3. Spreading cheese on the pizza
4. Baking the dough to form the crust
In making a pizza, which process involves a chemical change?
1. Mixing spices for the sauce
2. Slicing pepperoni for the topping
3. Spreading cheese on the pizza
4. Baking the dough to form the crust
All You Really Need To Know You Can Learn From Noah's Ark
11.Remember that the ark was built by amateurs; the Titanic was built by professionals.
12.Remember that woodpeckers inside are a larger threat than the storm outside.