Download Balancing Chemical Reactions

Bell Work
Write down these equations, then answer the following:
__BiCl5 + __Zn  __ZnCl2 + __Bi
and
__Mg(NO3)2 + __Na2SO4  __NaNO3 + __MgSO4
1) What coefficients are needed to balance the
equations?
2) What type of reaction are they (decomp, synth.,
combustion, S.R., D.R., or neutralization)?
3) Would these reactions occur?
4) Assign oxidation numbers to each
compound/element and determine if it is a redox
reaction. If so, what was reduced, what was oxidized,
what was the reducing agent and what was the
oxidizing agent?
Questions?
Reality Check
• Determine the Oxidation number for each
atom in the following:
Fe2O3
H2
Zn+2
Na2O
CO3-2
H2Cr2O7
• Prove that the following is a redox reaction by
determining the oxidation numbers of each
atom. Then identify the reducing agent and
oxidizing agent.
Cu + 2Ag+  Cu+2 + 2Ag
Choose Your Category
Will It
Happen
Oxidation
Numbers
Redox
Reactions
Balancing
Chemical
Reactions
Reaction
Types
Note Type
Questions
100
100
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100
100
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200
200
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300
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300
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400
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500
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500
Final Question
Random Points
400 points
Will It Happen - 100
This can be used to determine if a single
replacement reaction can occur.
The Answer is an
activity series
Back
Will It Happen - 200
• Will the following reaction occur?
AlO + Fe 
The Answer is no because
Fe is lower than Al
Back
Will It Happen - 300
• Will the following reaction occur?
Zn + CuSO4 
The Answer is yes because
Zn is higher than Cu
Back
Random Points
200 points
Will It Happen - 400
• Will the following reaction occur?
AgNO3 + (NH4)2SO4 
Back
The Answer is no
Because product would be Ag2SO4 (aq) and
NH4NO3 (aq)
Will It Happen - 500
Will the following reaction occur?
• Na2CO3 + BaCl2 
The Answer is yes
because BaCO3 would
be a solid.
Back
Oxidation Numbers - 100
• The oxidation number of a monatomic ion
is equal to _____________________
The Answer is the charge of
the ion.
Back
Oxidation Numbers - 200
• What is the oxidation number of Cu.
The Answer is 0.
Back
Random Points
200 points
Oxidation Numbers - 300
• The most electronegative element on the
periodic table has an oxidation number of
______________ when in a compound.
The Answer is -1.
Back
Oxidation Numbers - 400
• Assign oxidation numbers to all the atoms
in the following:
• HOCl
The Answer is +1/-2/+1.
Back
Oxidation Numbers - 500
• Assign oxidation numbers to all the atoms
in the following:
• AlNO3
The Answer is +3/+3/-2.
Back
Redox Reactions –
100
• Any chemical change in which one
species loses electrons and another
species gains electrons is known as this.
The Answer is a reduction – oxidation
reaction or a redox reaction.
Back
Random Points
300 points
Redox Reactions–
200
• This is defined as a chemical change in
which electrons are gained, either by the
removal of oxygen, the addition of
hydrogen, or the addition of electrons.
The Answer is reduction.
Back
Redox Reactions –
300
• What element was reduced in the
following reaction?
• 2 HCl + Mg  MgCl2 + H2
The Answer is H (it went from a +1
to a 0).
Back
Daily Double
Redox Reactions –
•
•
•
•
•
400
(peroxide)
-1
+1-1
+1-2
0
+1 -2
2Br -1 + H2O2 + 2H3O+ --> Br2 + 4H2O
What element was reduced? Oxygen
What element was oxidized? Bromine
What is the Reducing Agent? Br -1
What is the Oxidizing Agent? H2O2
Back
Redox Reactions –
500
What is the reducing agent in the following
reaction?
+1+5-2
+1-1
+2-2
0
+1-2
HNO3 + HBr  NO + Br2 + H2O
The Answer is HBr
Back
Balancing Chemical Reactions - 100
• These are the only thing that can be used
to balance chemical equations.
The Answer is
coefficients
Back
Balancing Chemical Reactions - 200
• Balance the following equation:
___ CaCO3(s)  ___ CaO(s) + ___ CO2(g)
The Answer is 1,1,1
Back
Random Points
500 points
Balancing Chemical Reactions - 300
• Balance the following equation:
__ CaH2 + __ H2O  __ Ca(OH)2 + __ H2
The Answer is 1,2,1,2
Back
Balancing Chemical Reactions - 400
AlCl3(aq) + Ba(OH)2(aq) --> Al(OH)3(s) + BaCl2(aq)
When this equation is correctly balanced, the
coefficient of the AlCl3 will be —
The Answer is 2
Back
Balancing Chemical Reactions - 500
• Balance the following equation:
__ C6H14 + __ O2  __ CO2 + __ H2O
The Answer is 2, 19, 12, 14
Back
Reaction Types - 100
• This type of reaction involves a
hydrocarbon and oxygen making water
and carbon dioxide.
The Answer is
combustion
Back
Reaction Types - 200
• Which reaction type best describes the
reaction above?
The Answer is single
replacement.
Back
Random Points
100 points
Reaction Types - 300
2 Fe + 3 Cl2  2 FeCl3
• Which reaction type best describes the
reaction above?
The Answer is
synthesis.
Back
Daily Double
Reaction Types - 400
• This type of reaction is shown in the
following graphic:
The Answer is
decomposition
Back
Reaction Types - 500
H2SO4 + 2 NaOH  Na2SO4 + 2 H2O
• Which reaction type best describes the
reaction above?
The Answer is
neutralization.
Back
Random Points
400 points
Note Type Questions - 100
• This type of reaction involves a
hydrocarbon and oxygen making water
and carbon dioxide.
The Answer is
combustion
Back
Note Type Questions - 200
• If an atom is reduced in a redox reaction,
what must happen to another atom in the
system?
The Answer is it must be
oxidized.
Back
Note Type Questions - 300
• Chemical equations must be balanced to
satisfy ___________________________
(multiple words).
The Answer is the law of
conservation of mass
Back
Note Type Questions - 400
• An element in the activity series can
replace any element
The Answer is below it
on the list.
Back
Note Type Questions - 500
• An insoluble solid produced by a chemical
reaction in solution is called
The Answer is a
precipitate.
Back
The Final Question
• The final question has to deal with:
»Balancing Chemical
Reactions and
Classifying Reactions
from words
Make your wager
Balance the following equation
and classify the type of reaction.
• Tetracarbon decahydride and oxygen
react together to make carbon dioxide and
water.
The Answer
• 2 C4H10 + 13 O2  8 CO2 + 10 H2O
• combustion