What are physical properties?
:What is the difference between physical and chemical properties?
Q
E
physical properties
both help to identify a substance
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chemical
properties
Chemical Change Mystery Substance
What are the physical properties of substance #1 and substance #2?
What are the physical properties of the new substance?
Can you identify the new substance? What clues did you use to help you identify it?
:What is the difference between physical and chemical properties?
EQ
Physical properties
Substance #1
Substance #2
New
Substance
New substance identity: __________________________________
Clues: ________________________________________________
DIRECTIONS
1. Add 1/2 cup of water to the powdered substance and stir until most of the crystals dissolve.
2. Pour the powdered substance solution into the bowl with the semi­liquid substance.
3. stir the semi­liquid until it becomes a white glob.
4. Use the spoon to press out any extra liquid.
5. Transfer the new substance to a petri dish. Allow 2 minutes to dry.
:What is the difference between physical and chemical properties?
Q
E
Plastic is a polymer.
Polymers are made by linking together monomers. mono = one
poly = many
http://science.howstuffworks.com/plastic2.htm
Video Link
http://video.nationalgeographic.com/video/environment/going­green­environment/green­
home­makeover/plastics­green­guide/
:What is the difference between physical and chemical properties?
Q
E
physical properties
both help to identify a substance
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e w ing s
tic th m
no me for
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th i
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chemical
properties
:What is the difference between physical and chemical properties?
Q
E
physical properties
chemical
properties
both help to identify a substance
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Definition
Graphic
Chemical Properties
Examples
Non­examples
Graphic
Definition
a substance made up of only one kind of atom
Examples
• Carbon
• Hydrogen
• Oxygen
• Iron
Element
pg. E41
Non­examples
Elemental Composition of the Human Body
(ingredient list for making a human)
Element
Oxygen
Carbon
hydrogen
nitrogen
calcium
phosphorous
potassium
sulfur
chlorine
sodium
iodine
trace elements
% of Human Body 65 %
18%
10%
3%
2%
1.10%
.35%
.25%
.15%
.15%
.10%
under .10 %
Graphic
Definition
the forces that join atoms to each other
Examples
Chemical Bond
Non­examples
sio
s
i
F
lear
c
u
N
n
b
o
B
om
At
ic
m
Graphic
Definition
a substance made up of 2 or more different elements
Examples
C6H12O6
H2O
NaCl
Compound
Non­examples
H
CC
CC
C
H
H
H
H
H
O
O
HO
O
O
H
H
O
H
H
O
O
H
O
O
O
O
C
O
H
Graphic
Definition
The ability of a substance
to react chemically
Examples
Reactivity
*Changing color
*producing heat, light, or a gas
Non­examples
Graphic
Definition
the ability of a substance to
burst into flames
Examples
Combustibility
Non­examples
Chemical
Physical
density
solubility
weight
freeze
mass
boil
length
mixture
burn
change of color
color
evaporate
react
compound
chemical bond
solution
production of light
melt
production of heat
change of state
condense
production of gas
elements
combust
Ticket out the door
3 ways you know a physical change has taken place
2 ways you know a chemical change has taken place
1 chemical property 1. two or more elements _________________
2. the ability to react _______________________
3. the ability to burst into flames _________________________
4. the force that holds elements together in a compound ___________________________
5. one kind of atom ____________________
6. properties that describe a substances ability to react ________________________________
7. properties that can be measured without changing the chemical composition ________________
8. no definite shape or volume_____________________
9. definite volume, no definite shape _________________________
10. definite shape and volume ____________________________
11. amount of matter in an object _______________________________
12. how squished together the matter is ____________________
13. amount of space an object takes up_________________________________
14. measures mass _________________________
15. measures weight ___________________________
16. measures volume _______________________________
17. the pull of gravity on an object ______________________________
18. the process by which a gas changes to a liquid ________________________
19. the process by which a liquid changes to a solid _______________________
20. the process by which a solid changes to a liquid
3. Know the factors that cause water to evaporate more quickly
4.