Chemical Reactions
By: Sammie
Chemical Reaction Basics
What part of atoms are affected?
The outermost part of the atom is affected
during a chemical reaction.
 What is happening during a chemical
reaction?
During a chemical reaction bonds are broken
and formed.
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www.chemistry.mtu.edu/~pcharles/SCIHISTORY/08nuclearatom.html
http://wiki.answers.com/Q/What_happens_when_a_chemical_reaction_occurs
Chemical Reaction Basics
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Reactants-number of each of the elements
on the reaction side of the reaction equation
Product-number of each of the elements on
the product side of the reaction equation
Law of conservation of mass-says that mass
of a closed system will remain constant
http://en.wikipedia.org/wiki/Element-Reactant-Product_Tables
http://en.wikipedia.org/wiki/Conservation_of_mass
Chemical Reaction Basics
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Signs of Chemical Reactions
-form of precipitation
-color change
-formation of gas
-increase & decrease temperature
-energy produced
http://wiki.answers.com/Q/What_are_the_5_signs_of_a_chemical_reaction
Energy & Chemical Reactions
Explain the role of energy in chemical
reactions.
Their role is to break intermolecular bonds so
elements can escape their compounds and
bond with different elements.
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http://answers.yahoo.com/question/index?qid=20080621044544AAYELRh
Energy & Chemical Reactions
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Chemical potential energy-a form of energy
related to the structural arrangement of
molecules or atoms
Starting a reaction-to start a reaction you
need what is called “activation energy”
http://en.wikipedia.org/wiki/Potential_energy
http://wiki.answers.com/Q/What_is_the_energy_needed_to_start_a_chemical_reaction
Energy & Chemical Reactions
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Exothermic-is a chemical reaction that
releases heat
examples: combustion, adding
concentrated acid to water, setting of cement,
and adding water to hydrous copper (II)
sulfate
Endothermic-absorbs energy; cold
examples: depressurizing a pressure can,
and a chemical cold pack
http://en.wikipedia.org/wiki/Endothermic
http://en.wikipedia.org/wiki/Exothermic
Types of Chemical Reactions
Explains what happens in the different types
of reactions.
Exothermic releases energy creating heat.
Endothermic absorbs energy creating cold.
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www.wiki.answers.com/Q/What_happens_to_broken_chemical_bonds_during_a_chemical_reaction
Types of Chemical Reactions
Explains how to tell the type of reaction by looking at
the chemical formula for the reaction.
-synthesis;2 substances combine to form 1
-decomposition;1 substance decomposes to form 2
substances
-single replacement-single exchange of partner
-double replacement-double exchange of partners
-combustion-reactant contains O2
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http://www.bernard.p.sardissecondary.ca/files/science%2010%20-%20experiment%203%20-%20types%20of%20chemical%20reactions.pdf
Types of Chemical Reactions
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Synthesis-purposeful execution of chemical reactions in
order to get a product; A+B=AB
Decomposition-separation of a chemical compound into
elements or smaller compounds; AB=A+B
Combustion-sequence of exothermic reactions between a
fuel and oxidant accompanied by heat or light (flames); O2
Single replacement-a single uncombined element replaces
another in a compound; Zn+2HCl=ZnCl2+H2
Double replacement-a chemical reaction between
compounds each of the product having one element from the
other; AX+BY=AY+BX
http://en.wikipedia.org/wiki/Chemical_Synrhesis
http://en.wikipedia.org/wiki/Chemical_decomposition
http://en.wikipedia.org/wiki/Combustion
http://wiki.answers.com/Q/What_is_a_single_replacement_reaction
www.answers.com/topic/double-replacement-reaction-chemistry