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Balancing Reactions
K Warne
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Balancing Reactions
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Reactions
O
O
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Reaction Equations
O
H2O
O
H2O
O
O+
TWO
molecules of
Hydrogen gasand
One
MOLECULE of
Oxygen gas
REACT
to form
Two
MOLECULES of
water
H2 H2 O2
2H2 + O2 2H2O
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Balanced reaction
H2 + F2 2HF
Balancing Reactions
H H F F H F
Unbalanced reaction
H2 + F2 HF ?
H H F F
H F
H F
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Conservation of Mass
1. Butane reacts with oxygen
1 2
Reactants
Substance O C H No.
oxygen 26 0 0 26
butane 0 8 20 28
TOTAL 26 8 20 54
2. Carbon dioxide and water are formed
Products
Substance O C H No.
Carbon dioxide 16 8 0 24
Water 10 0 20 30
TOTAL 26 8 20 54
butane
The principle of the conservation of matter and mass is demonstrated in this
example – the total number of atoms remains CONSTANT
NO MASS IS LOST!
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REACTIONS
1. __________ reacts with ________ 2. ___________ and ______ are formed
Butane + Oxygen Carbon dioxide + water
C4H10 + ___O2 __CO2 + __H2O
1 2
Reaction equation
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Tips for Balancing Equations
• Balance in the order:
Metals, Non-metals, oxygen then hydrogen.
• Always leave the element on its own (not bonded) to last.
• Check all formulae are correct if a reaction won’t balance.
• You can ONLY balance by changing coefficients. (Big numbers in front.)
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Balancing Reactions
1. Na + Cl2 --> NaCl
2. C + Cl2 --> CCl4
3. ZnS + O2 --> ZnO + SO2
4. FeS + HCl --> H2S + FeCl2
5. SO2 + H2S --> S + H2O
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Balancing More Reactions
1. Na + H2O --> NaOH + H2
2. H2 + O2 --> H2O
3. CaCO3 --> CaO + CO2
4. CaCl2 + Na2SO4 --> CaSO4 + NaCl
5. AlNO3 + K2CO3 --> Al2(CO3)3 + KNO3
6. Na3PO4 + MgI2 --> Mg3(PO4)2 + NaI
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Molecules
O2
a3CH4
bCO2
c
H2S
CH4 + O2 ---> CO2 + H2O
Methane + oxygen --> water + carbon dioxide
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Hi -
This is a SAMPLE presentation only.
My FULL presentations, which contain a lot more more slides and other resources, are freely
available on my resource sharing website:
www.warnescience.net(click on link or logo)
Have a look and enjoy!
WarneScience