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Chemical Reactions (8th grade Science)
Transcript of Chemical Reactions (8th grade Science)
What is a chemical Change/
a chemical change takes place when t
wo or more
substances interact to form a
Evidence of a chemical reaction
Physical Change vs Chemical Change
Changes to matter in which
composition of the matter stays the same.
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!
mixing vinegar & baking soda
burning a piece of wood
What are some examples of physical properties?????
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
D. ____ cutting a pizza
E. ____ Braiding your hair
pizza dough + tomato
- a solid that forms from a solution
during a chemical reaction
What are some examples of Chemical properties?????
A characteristic of a substance that can be observed without changing the substance into another substance
(acidic or basic)
Describing chemical reactions
and other symbols instead of words to summarize a reaction
- substances you have at the beginning
- new substances produced when the reaction is complete
The Law of Conservation of Mass...
That in a chemical reaction, the
We will continue this when
we discuss balancing
Which animal can go longer
than a camel without water?
(Rats cant vomit)
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?
energy is absorbed or given off
(endothermic vs. exothermic)
Kind of like a recipe....
Just like in our recipe...
pizza dough + tomato sauce+cheese
The Law of Conservation of Mass states...
Matter is neither created nor destroyed!
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