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Balancing Chemical Equations I
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Slide 1

Balancing Chemical Equations

Balancing Chemical Equations

Just follow these steps…….

It’s quite easy really

Slide 2

Firstly you need an equation with the correct “formulae” in………. You’ll probably be given this in the question

Firstly you need an equation with the correct “formulae” in………. You’ll probably be given this in the question

Just like this one

Mg + O2  MgO

Mg

O

Slide 3

[1] Just count up the atoms on each side

[1] Just count up the atoms on each side

Then start balancing:

1

1

1

2

[2] The numbers aren’t balanced so then add “BIG” numbers to make up for any shortages

And adjust totals

2

2

2

Slide 4

But the numbers still aren’t equal, so add another “BIG” number

But the numbers still aren’t equal, so add another “BIG” number

2

And adjust totals again

NOW BOTH SIDES HAVE EQUAL NUMBERS OF ATOMS

WE SAY THAT THE EQUATION IS BALANCED!!

2

Slide 5

Try to balance these equations using the same method:

Try to balance these equations using the same method:

[1] Na + Cl2  NaCl

[2] CH4 + O2  CO2 + H2O

[4] Al + O2  Al2O3

[3] Li + HNO3  LiNO3 + H2

Slide 6

How did you get on??

How did you get on??

[1] 2 Na + Cl2  2 NaCl

[2] CH4 + 2 O2  CO2 + 2 H2O

[4] 4 Al + 3 O2  2 Al2O3

[3] 2 Li + 2 HNO3  2 LiNO3 + H2

Here are the answers:

HOPE YOU’VE GOT THE IDEA… REMEMBER TO CHECK THAT YOU CAN DO ELECTROLYSIS EQUATIONS TOO

Slide 7

Electrolysis equations ones to check

Electrolysis equations ones to check

[a] Cu2+ + e-  Cu

[b] Cl- - e-  Cl2

[c] H+ + e-  H2

[d] Br -  Br2 + e-

Slide 8

The answers are….

The answers are….

Remember to balance the charges on each side of the arrow

[a] Cu2+ + 2 e-  Cu

[b] 2 Cl- - 2 e-  Cl2

[c] 2 H+ + 2 e-  H2

[d] 2 Br -  Br2 + 2 e-

Slide 9

Hope that makes things a bit clearer….

Hope that makes things a bit clearer….

Just remember it’s all about balance

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