Download Chemical Reactions

1 – Chemical Reaction Basics
 2 – Energy & Chemical Reactions
 3 –Types of Chemical Reactions
 4 – Types of Chemical Reactions
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What part of atoms are affected during a
chemical reaction?
When a chemical reaction occurs the
atom are only rearranged. No new
atoms are created!
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What is happens during a chemical reaction?
When a chemical reaction happens the
electrons form a ring and that changes strictly
involve the motion of electrons.
Def: Chemical reaction- is a process involving
one, two or more substances, characterized by
a chemical change and yielding one or more
product(s) which are different from the
reactants.
What does reactants and Products
mean?
Def: Reactants – the materials that exists
before hat chemical reaction
Def : Products – Substances that are
created by the chemical reaction
http://www.chemistryland.com/CHM107/EarlyChemistry/ClayChemistry/LightningAndFire.jpg
What are the signs that a chemical reaction has
occurred?
1. A gas has been produced (Bubbles)
Example: Baking soda & vinegar
2. A change in color 
Example: Iron rusting
3. A change in temperature 
Example: a flame or cool reaction
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What does Law of conservation of mass mean?
Def: Law of conservation of mass: “Says that the mass
of a closed system will remain consistent, regardless
of the process acting inside the system.”
http://en.wikipedia.org/wiki/Conservation_of_mass
http://yorkcountyschools.org/teachers/jchristman/chemistry.jpg
How does the Law Of Conservation of
mass relates to a chemical reaction?
When a Chemical Reaction happens no
new atoms are created or destroyed
that is because of the Law Of
Conservation Of Mass. It also states the
mass of substances produced by a
chemical reaction.
What is the role of energy in chemical reactions?
Energy’s role in a chemical reaction is to break
intermolecular bonds so elements can escape
their compounds and bond with different
elements.
Chemical Potential Energy
A potential energy is for a physical change.
Example: when you heat up water it turns to
vapor
and vapor has more potential
energy than water.
What is Exothermic and Endothermic
reactions?
Exothermic reaction is where the energy
content of the product is less than the
reactants; heat is been given out from
the system.
Endothermic reaction is where the energy
content of the product is less than that of
the reactants; heat is taken in by the
system.
What is Activation energy and what does it affect
during a chemical reaction?
Def: Activation Energy :
“The minimum energy reactants must have to
start a chemical reaction.”
http://www.google.com/search?hl=en&oi=definer&q=define:activation+energy+is&defl=en
Activation energy in science in it’s energy
needed. Activation energy is used to donate
its energy. Its energy is needed for a chemical
reaction to occur.
http://www.bio-medicine.org/biology-definition/Activation_energy/
1.
Combustion
Reaction is when oxygen
combines with another compound to form
water and carbon dioxide. These reactions
are Exothermic they produce heat.
http://www.cdc.gov/eLCOSH/docs/d0400/d000485/image3.jpg
2. Synthesis Reaction
Is when two or more simple compound
combine to form a more complicated one
.
3. Decomposition reaction
Is the opposite of a synthesis reaction- a
complex molecule breaks down to make
simpler ones.
4. Single displacement
Is when one element trades places with
another element in a compound.
5. Double displacement
When the anions and cations of two
different molecules switch places to form two
entirely different compounds
Examples of each reaction…
Combustion
Reaction 
Synthesis Reaction
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Decomposition reaction
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Single displacement 
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Double displacement 
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How can you tell the type of reaction by
looking at the chemical formula?
“A chemical equation will tell you the formulas and symbols of the reactants and
products.”
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“ A chemical equation can show the physical state of a substance, whether it is a solid,
liquid, gas, or in solution.”
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“ A chemical equation can show if special conditions are required for a reaction to take
place, such as adding heat or using a catalyst.”
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“chemical equation can show if special conditions are required for a reaction to take
place, such as adding heat or using a catalyst.”
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“And, if the equation is balanced: The coefficient numbers in the equation show the
number of molecules, formula units, or atoms of the species involved in the reaction. The
coefficients also equal the number of moles of each reactant and product.”
Found on
http://www.cliffsnotes.com/WileyCDA/Section/What-information-is-contained-in-achemical-equation-.id-305406,articleId-27921.html
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http://en.wikipedia.org/wiki/Conservation_of_mass
 http://answers.yahoo.com/question/index?qid=20
080621044544AAYELRh
 http://answers.yahoo.com/question/index;_ylt=Atn
Dm._xQXnTz7MEyhQ2UiMjzKIX;_ylv=3?qid=20071029
073143AACweCC
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