chemical reactions the process by which one or more substances are changed into one or more...
TRANSCRIPT
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Chemical Reaction
s
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the process by which one or more substances are changed into one or
more different substances
Chemical Reaction
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REACTANTSthe starting substances in
a chemical reaction(the stuff on the left)
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PRODUCTSthe final substances in a
chemical reaction(the stuff on the right)
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REPRESENTATION OF PHYSICAL STATES IN
EQUATIONS
• (g) = gas
• (l) = liquid
• (cr) = solid (stands for crystalline)
• (aq) = substance dissolved in water
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WRITING BALANCED EQUATIONS
• STEP 1: Determine the reactants and the products
• STEP 2: Assemble the equation• STEP 3: Balance the equation (get
the same # of atoms of each element on each side)
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WARNING!!!Never
Ever
EverCHANGE THE SUBSCRIPT
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two or more substances combine
to form one new substance
SYNTHESIS
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A + B ABSYNTHESIS
Na + Cl2 NaClPb(IV) + O2 Pb2O4
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when a substance breaks up into
simpler substances
DECOMPOSITION
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AB A + BDecomposition
NaCl Na + Cl2
Pb + O2Pb2O4
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one element displaces another
in a compound
SINGLE DISPLACEMENT
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Single Displacement Reaction
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AB + C AC + B or CB + A
Single Displacement
NaBr + Cl2 NaCl + Br2
(NH4)2S + O2 (NH4)2O + S
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DOUBLE DISPLACEMENT
the positive or negative portions of two compounds are
switched
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AB + CD AD + CB
Double Displacement
NaBr + Pb2S3 Na2S + PbBr3
K2SO4 + Ba(OH)2 KOH + BaSO4
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hydrocarbon reacts with oxygen to form carbon dioxide and
water
COMBUSTION (aka OXIDATION)
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Writing Balanced Equations When Given Words Only
• STEP 1: Write out the symbols
• STEP 2: Balance your charges (if needed)
• STEP 3: Check for diatomics
• STEP 4: Balance Equation