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Chemical Reactions (8th grade Science)

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by

Natosha Daniels

on 11 September 2014

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Transcript of Chemical Reactions (8th grade Science)

Matter and Energy
Chemical Reactions
What is a chemical Change/
Reaction?
a chemical change takes place when t
wo or more
substances interact to form a
new substance.
Evidence of a chemical reaction
Physical Change vs Chemical Change
Changes to matter in which
composition of the matter stays the same.
Many
can be reversed
.
Example: Folding paper/ripping paper
You usually need
more than on
e of the above characteristics to be considered a chemical change!

Examples
mixing vinegar & baking soda
burning a piece of wood
soured milk
cooking food/
making toast
What are some examples of physical properties?????
color
melting point
boiling point
electrical conductivity

density
state (solid, liquid, or gas)
Classify each of the following as a
1) physical change or 2) chemical change
A. ____ a burning candle
B. ____ melting ice
C. ____ toasting a
marshmallow
D. ____ cutting a pizza
E. ____ Braiding your hair

pizza dough + tomato
sauce+cheese
Precipitate
- a solid that forms from a solution

during a chemical reaction
heat
rusting
sound
BRAIN BREAK!
What are some examples of Chemical properties?????
A characteristic of a substance that can be observed without changing the substance into another substance
burning
PH
(acidic or basic)
Reactivity
rusting
Describing chemical reactions
Chemical equations
use
chemical formulas
and other symbols instead of words to summarize a reaction
Reactants
- substances you have at the beginning

Products
- new substances produced when the reaction is complete
The Law of Conservation of Mass...
That in a chemical reaction, the
total mass
of the
reactants
must
equal
the
total mass
of the
products
We will continue this when
we discuss balancing
chemical equations....
Random Trivia!!!

Which animal can go longer
than a camel without water?
Rats.
(Rats cant vomit)
Physical vs
Chemicalproperties
N. Folarin 2010
These reactions are not easily reversed!
Was that a chemical Reaction?

Why or why not? What evidence did you see?
What is a physical property?
Physical Changes...
.
light,
odor,
fizzing/foaming,
color changes
energy is absorbed or given off
(endothermic vs. exothermic)
Kind of like a recipe....
Just like in our recipe...
pizza dough + tomato sauce+cheese
reactants
products
yields
The Law of Conservation of Mass states...
Matter is neither created nor destroyed!
City Girls Love Their Phones
color change
gas production
light
Temperature Change
Precipitate
Full transcript