Activating Strategy
Engage Your Brain- page 21- Answer #1-2
Write the Lesson Essential Question in the note
section of your lesson packet.
EQ: How does matter undergo chemical and
physical changes?
1
Active Reading page 21
Complete #3
PHYSICAL EDUCATION- page 22
What are physical properties of matter?
Normally, when describing an object, you identify
what it is about that object that you can observe
without changing its identity.
2
A characteristic of a substance that can be
observed and measured without changing the
identity of the substance is called a physical
property.
All of your senses can be used to detect physical
properties. Color, shape, size and texture are a
few of the properties you encounter.
Answer Question #5 on page 22
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Physical properties can be observed without
changing the identity of the substance.
The boiling point of water is an example of a
physical property.
Water is water whether it is a solid, liquid or gas.
In your table groups, discuss and answer #6
The objects are gold, the table, and person in a
suit.
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Answer #6
Gold- it is a solid, liquid, gold in color, it is able to
be shaped or bent.
Table- round, heavy, and large
Person in suit- thick and heavy
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#7 Thinking Outside the Box- Mystery Object
On the 3x5 card, place your name in the upper right
corner.
Describe a common object by making a list of at least
3-4 physical properties.
THESE SHOULD BE ONE WORD CLUES---NO
SENTENCES
If you need help with physical properties go back to
page 22 to seek help!!!
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Now you will be given a new 3X5 card.
You will need to try and guess what object is
being described by one of your classmates.
Write the name of the object in the bottom left
hand corner.
Write your name in the bottom right hand corner.
Who thinks that they could stump a classmate
with your description?
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Common Physical Properties- page 24
With your table group partners, observe the pictures and
explanations on page 24 and 25 and answer questions
#8 thru 11.
Answer Question #8- The vinegar is more dense than
that oil because it sank to the bottom.
Answer Question #9- Yes because solubility is a
physical property. The solid particles of the drink
mix would be left behind.
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Answer #10- Aluminum can be rolled into sheets
of aluminum foil that are used in food packaging.
Answer #11- Both the geyser’s eruption and the
tea kettle whistle are both caused by water vapor.
As water boils, the vapor escapes through the hole
in the tea kettle causing the whistle.
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What are chemical properties of matter? Page 26
A chemical property describes a substance’s
ability to change into a new substance with
different properties.
Common chemical properties include flammability
and reactivity with substances such as oxygen,
water, and acids.
Examples, Rusting and tarnishing are chemical
properties because the metal changes.
10
Questions #13- With your table partners, I would
like you to brainstorm an answer to the question.
Answer: Iron and steel rust more easily in we
climates because there is more moisture in the air.
This allows more oxygen to come into contact
with metal to make rust.
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Page 27
Wood for a campfire has the chemical property of
flammability (the ability to burn).
When wood burns, new substances are formed:
water: carbon dioxide, and ash.
Reactivity-the ability of a substance to interact
with another substance to form a new substance.
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Page #28: What is the difference between physical
and chemical properties?
A physical property can always be observed
without changing the identity of a substance.
A chemical property is observed by attempting to
change the identity of a substance.
Example: To witness a log’s flammability, you
must try and set the log on fire.
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With your table group partners, answer question
#14, 15, and 16.
Answers:
#14- A Physical property can be seen without
changing the identity of the matter. A chemical
property cannot be seen without changing the
identity of the matter.
14
Answer #15: The nail on the left shows the
physical property of malleability. The nail is bentit can be seen without changing the identity of the
substance.
The nail on the right shows the chemical property
of reactivity. The nail’s identity has been changed
by the reactivity of the iron in the nail and oxygen.
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Answer #16Malleable = Physical
Reacts with oxygen= Chemical
Magnetic=physical
Nonflammable=chemical
THE COOLEST CHEMICAL REACTIONS
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Page#30
How can physical and chemical properties identify
a substance?
Properties unique to a substance are its
characteristic properties. Characteristic properties
can be physical or chemical properties.
Since gold has density four times that of iron
pyrite, distinguishing gold from iron pyrite should
be easy.
Mining For Gold
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DO THE MATH
Sample Problem page 31
“You Try It” page 31- calculate the density of the
unknown object and make sure you answer the
question at the end.
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Complete the questions on page 32 with your
table groups.
22)
23)
24)
25)
26)
27)
Solubility
Liquid
Reactivity with water
Burn
Do not
Compare Conductivity and Density
19
Complete Page #33 All Questions
If you do not finish in class, the remaining
questions are to be completed for homework.
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Lesson Review Page 33
1) Chemical
2) Physical
3) It is a solid, It is shiny, It is malleable
4) There is no effect because the identity of the
substance does not change.
5) You can cut a substance in half which would
change the mass but not the substance.
6) Yes, if you observe a chemical property, new
substances are being made.
21
7)
Sample A= Iodine
Sample B= Bromine
Sample C=Chlorine
8) The volume of iron pyrite is more than the
volume of gold.
9) Physical Properties
Density- less than water
Enough strength to not break
It is insoluble in water
22
#9 Continued
Chemical Properties
Does not react with water
23
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