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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