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Transcript of 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
energy is absorbed or released (endothermic & exothermic)
a characteristic of a substance that can be observed without changing the substance into a new substance
state (solid, liquid, or gas)
What are some examples of physical properties?
What are some examples of chemical properties?
pH factor (acid or base)
a change in the state, size, or shape of a substance
the substance does not change chemically
most can be reversed
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
fire + wood = ash
ash = new substance
iron + water + air = rust
rust = new substance
Good luck reversing that one....
A helpful pnuemonic....
City Girls Love Their Phones
Classifying Chemical Reactions
Was that a chemical reaction?
Why or why not?
What evidence did you see?
Kind of like a recipe....
pizza dough + sauce + cheese =
There are specific
we use for certain parts of a
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.....
one more just for fun....
What is a physical property?
: a new
is formed by the combination of simpler
on Earth is made up of one or more of the elements.
is any material that is made up of a single atom.
Matter can exist in
different states, or phases.
When matter changes from one
to another it is called a
physical properties of matter
-matter with definite shape and volume.
-matter with a definite volume but no definite shape. It takes on the shape of it’s container.
Example: apple juice
-matter which has no definite shape nor volume.
-extremely hot, electrically charged, gaseous material.
Four Phases of Matter
classifying Chemical Reactions
Classifying Chemical Reactions
: one reactant is always
often contains carbon and hydrogen
exothermic reactions release
in the form of
is released when the
form than is needed then energy is
reactions are ALL
energy associated with a bond is called
energy is required to break
and energy is
when they form again
endothermic reactions absorb
is required to break the bond then less energy is
when the new bond is formed and energy is
is a type of endothermic reaction, but it
the energy to
instead of just absorbing it