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Chemical Reactions

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by

Honey Davidge

on 4 April 2016

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Transcript of Chemical Reactions

Chemical Reactions

Physical vs. Chemical Properties
Physical Changes vs. Chemical Changes
Evidence of a Chemical Reaction
precipate - a solid that forms from a solution during a chemical reaction
heat
rust
sound
light
odor
fizzing/foaming
color change
energy is absorbed or released (endothermic & exothermic)

a characteristic of a substance that can be observed without changing the substance into a new substance
color
melting point
boiling point
color
density
state (solid, liquid, or gas)
What are some examples of physical properties?
What are some examples of chemical properties?
burning
pH factor (acid or base)
reactivity
rust
a change in the state, size, or shape of a substance
the substance does not change chemically
most can be reversed
examples
folding or ripping paper
water - three phases (solid, liquid, gas)
a chemical change takes place when a new substance is formed
bonds are broken, new bonds are formed
examples:
fire + wood = ash
ash = new substance
iron + water + air = rust
rust = new substance
Chemical Changes
Physical Changes
Good luck reversing that one....
A helpful pnuemonic....
City Girls Love Their Phones
C
olor Change
G
as Production
L
ight
T
emperature Change
P
recipitate
Classifying Chemical Reactions
Was that a chemical reaction?
Why or why not?
What evidence did you see?
Describing Chemical
Reactions
Kind of like a recipe....

pizza dough + sauce + cheese =
There are specific
names
we use for certain parts of a
chemical reaction
.
Reactants & Products
reactant - a substance present before a chemical reaction occurs

product - what is formed after a chemical reaction occurs
just like in our recipe.....
reactants
product
one more just for fun....
What is a physical property?
synthesis
: a new
compound
is formed by the combination of simpler
reactants
All
matter
on Earth is made up of one or more of the elements.
An
element
is any material that is made up of a single atom.
Matter can exist in
four
different states, or phases.
When matter changes from one
phase
to another it is called a
physical
change.

physical properties of matter
Solid
-matter with definite shape and volume.
Example: apple
Liquid
-matter with a definite volume but no definite shape. It takes on the shape of it’s container.
Example: apple juice
Gas
-matter which has no definite shape nor volume.
Example: oxygen
Plasma
-extremely hot, electrically charged, gaseous material.
Example: lightning

Four Phases of Matter
classifying Chemical Reactions
decomposition
: reactant
breaks down
into simple
products
Classifying Chemical Reactions
combustion
: one reactant is always
oxygen
and another
reactant
often contains carbon and hydrogen
exothermic reactions
exothermic reactions release
energy
in the form of
heat
if more
energy
is released when the
products
form than is needed then energy is
released
increase in
temperature
combustion
reactions are ALL
exothermic
reactants
-->
products
+
energy
energy associated with a bond is called
bond energy
energy is required to break
bonds
and energy is
released
when they form again
endothermic reactions
endothermic reactions absorb
energy
if more
energy
is required to break the bond then less energy is
released
when the new bond is formed and energy is
absorbed
decrease in
temperature
photosynthesis
is a type of endothermic reaction, but it
converts
the energy to
sugar
instead of just absorbing it
reactants
+
energy
-->
products
Full transcript