A 2 + 3BA2B3A2B3 Balancing Equations can be fun yet tough! This presentation will provide you some...
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Transcript of A 2 + 3BA2B3A2B3 Balancing Equations can be fun yet tough! This presentation will provide you some...
A2 + 3B A2B3
Balancing Equations can be fun yet tough!
This presentation will provide you some helpful tricks.
Chemical ReactionsChemical Reaction (rxn): Atom arrangement
is changed. (Bonds are formed or broken)
Chemical Equation: Shorthand notation describing what has taken place in a rxn.
Chemical ReactionsReactants: Beginning substances
Products: Ending substances
Reactants ProductsYields
Chemical ReactionsPhases of Matter:
Solid (s)
Liquid (l)
Gas (g)
Aqueous Solution (aq)
-solids dissolved in water solution
Chemical ReactionsCatalyst: Speed up a reaction, but are not used
up in the reaction & are shown above the arrow
Reactants ProductsA + B AB
Chemical ReactionsLaw of the Conservation of Matter:
Matter is not created nor destroyed, but conserved in any chemical reaction
Must have same # of elements on both sides of the reaction.
Chemical ReactionsCoefficients: Numbers placed in
front of a formula, used to balance
HgO Hg + O2
Reactants Products
2 2
Chemical Reactions
H2O(l) H2 + O2
Notice that as it stands, we have one oxygen on the reactants side and two oxygen atoms on the product
side of the equation.
2Adding a coefficient “2” in front of H2O corrects our oxygen problem, but now
causes Hydrogen to be unbalanced...
2Adding a coefficient “2” in
front of H2 corrects our unbalanced hydrogen problem.
We now have the same number of hydrogen and
oxygen atoms…It’s balanced!
Chemical Reactions
Cu + AgNO3 Cu(NO3)2 + Ag
It is helpful to list the atoms involved and find out what is balanced and what is unbalanced
(Hint = Polyatomic ions stay together!)
Reactants
Cu = 1
Ag = 1
NO3 = 1 .
Products
Cu = 1
Ag = 1
NO3 = 2 .
Unbalanced
2
2
2 Unbalanced
2
2
Chemical Reactions
F2 + H2O HF + O2
Reactants
F = 2
H = 2
O = 1 .
Products
F = 1
H = 1
O = 2 .
Try this one on your own!
Unbalanced
2
2
4 Unbalanced
4
4
4Unbalanced
2
4
Balanced!
Try this on your own and then learn a great trick
NH3 + O2 N2O4+ H2OReactants
N = 1
H = 3
O = 2 .
Products
N = 2
H = 2
O = 5 .
2
2
6 6
3
7
The only way to make 2 oxygen atoms into 7 oxygen atoms is to have a coefficient of 3.5. This is not acceptable.
3.5
Hint: Double all coefficients except the “problem”.
4
4
12
2
4
11
6
12
14Now there are an even # of product
oxygen atoms
7
14
N a m e : _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ D a t e : _ _ _ _ _ _ _ _ _ _ _ _ P e r i o d : _ _ _ _ _ _ _ _ _ _ _
B a l a n c e t h e f o l l o w i n g e q u a t i o n s a n d n a m e e a c h c o m p o u n d !
1 . H 2 + O 2 H 2 O
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
2 . Z n + H C l H 2 + Z n C l 2
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
3 . P b ( N O 3 ) 2 + K 2 S P b S + K N O 3
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
4 . C O 2 + H 2 O H 2 C O 3
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
5 . A l 2 ( S O 4 ) 3 + C a ( O H ) 2 A l ( O H ) 3 + C a S O 4
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
6 . C u + C l 2 C u C l 2
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
7 . M g + H C l M g C l 2 + H 2
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
8 . B a C O 3 + C + H 2 O C O + B a ( O H ) 2
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
9 . R b B r + A g N O 3 A g B r + R b N O 3
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
1 0 . N a 2 C O 3 + C a C l 2 C a C O 3 + N a C l
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
a. Al + O2 Al2O3
b. Al + Fe2O3 Al2O3 + Fe
c. KClO4 KCl + O2
d. Ca(OH)2 + HNO3 Ca(NO3)2 + H2O
e. Cr2(SO4)3 + NaOH Cr(OH)3 + Na2SO4
f. Cu + AgNO3 Cu(NO3)2 + Ag
g. CH4 + O2 CO2 + H2O
h. C2H6 + O2 CO2 + H2O
i. SiO2 + HF SiF4 H2O
j. MgO + H3PO4 Mg3(PO4)2 + H2O
k. PbO2 PbO + O2
l. NaBr + Cl2 Br2 + NaCl
m. Sb2S3 + HCl H3SbCl6 + H2S
n. Ag + HNO3 AgNO3 + NO + H2O (extra credit!)
o. C3H8 + O2 CO2 + H2O
p. FeS2 + O2 Fe2O3 + SO2
Name: __________________
Date: __________ Period:____
Side #1 Side #2
Checking both sides for a grade!Checking both sides for a grade!Checking both sides for a grade!Checking both sides for a grade!Checking both sides for a grade!Checking both sides for a grade!Checking both sides for a grade!Checking both sides for a grade!