States of Matter Notes

1
Physical vs. Chemical Changes Notes
20 NOV 14
Starter
Application
Agree or disagree with each of these statements 1. 2. 3.
Practice
Connection/ Exit
2
Agree or disagree with each of these statements.
1. Mixing powdered drink mix with water causes a
new substance to form.
Starter
2. If you combine two substances, bubbling is a
sign that a new type of substance may be forming.
3. If you stir salt into water, the total amount
of matter decreases.
3
Physical vs. Chemical Changes Notes
20 NOV 14
Starter
Application
Agree or disagree with each of these statements 1. 2. 3.
Practice
Connection/ Exit
4
Matter undergoes changes all of the time.
Practi ce
5
There are two types of changes
physical
chemical
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Physical changes
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Physical changes occur when the appearance of a
substance changes
8
but chemically the substance is the same.
9
The individual molecules do not change.
10
Examples of physical changes are, melting,
freezing,
11
or changing size or shape.
12
A physical change also occurs when substances are
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mixed and something dissolveslike making salt
water or Kool-aid.
14
The water, salt and sugar still keep their
original properties and the substances can be
separated again.
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Chemical Changes
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A chemical change occurs when the atoms making up
matter rearrange..
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to form a new substance with new properties.
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This usually occurs during a chemical reaction.
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Evidence of a chemical change
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Production of a gas.
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bubblesfizzingfoamingsmokeodor
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color changenot all color changes are chemical!
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A different color appears
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not all color changes are chemical!
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Formation of a precipitate
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cloudinessfoggysolid at bottom of container
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Change in heat or light energy
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Sparksexplosionglowing
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temperature increases or decreases
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These are only clues
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a chemical change has not actually taken place
unless matter has changed into a new substance.
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Some common examples of chemical changes include
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Rusting
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Tarnishing
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Burning
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Cooking
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Digesting
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If you have the chemical equation, you can tell
if a chemical change has taken place by
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Looking to see if the products in the equation
are.
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different from the reactants.
41
Application Place a P in the blank if it is a
physical change and a C in the blank if it is a
chemical change.

1. ______ An iron nail rusting.
2. ______ Baking cookies.
3. ______ Chopping wood
4. ______ Digesting food for energy
5. ______Ice melting.

42
Connection/Exit

1. Which of Spanglers experiments shows chemical
   changes?
2. What evidence do you have?