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Balancing reaction equations
This sequence of slides includes two approaches to
balancing reaction equations. Individual slides may
be copied elsewhere or used as templates.
1 Using symbols and no text
click here
2 Using text prompts to explain
each step of the process
click here
To return to this page,
click the button to the top right of any slide.
Original slide
prepared for the
2Mg +
O2  2 MgO

Symbols Mg + O2
Original slide
prepared for the
2 Al
+ 1½
3 I2  2 AlI3

Symbols Al +
I2
Original slide
prepared for the
Write a balanced equation
sodium + water  sodium hydroxide + hydrogen
formula
each
substance
Checkthe
thein
equation
balanced:
Add Write
numbers
front of
ofis
the
ringed
formula
asofitreactant
is ringedof
above
countsothe
number
and
productsymbols
elements
that
the total
number
reactant
= total
number
of product
symbols
sodium
hydroxide
is ionic:
Reactants:
2Na 4H
2O
what are the formulae of its ions?
Products:+ 2Na 4H- 2O
Na and OH
It’s balanced!
2 Na + 2 H2O  2 NaOH + H2
Original slide
prepared for the
References
First example, with symbols only:
Frank Harriss of Malvern College
Second example, with text prompts: Steve Lewis
Original slide
prepared for the
Original slide
prepared for the
Balancing reaction equations
This sequence of slides includes two approaches to
balancing reaction equations. Individual slides may
be copied elsewhere or used as templates.
1 Using symbols and no text
click here
2 Using text prompts to explain
each step of the process
click here
To return to this page,
click the button to the top right of any slide.
Original slide
prepared for the
2Mg +
O2  2 MgO

Symbols Mg + O2
Original slide
prepared for the
2 Al
+ 1½
3 I2  2 AlI3

Symbols Al +
I2
Original slide
prepared for the
Write a balanced equation
sodium + water  sodium hydroxide + hydrogen
formula
each
substance
Checkthe
thein
equation
balanced:
Add Write
numbers
front of
ofis
the
ringed
formula
as
is ringedof
above
countsothe
number
ofitreactant
and
productsymbols
elements
that
the total
number
reactant
= total
number
of product
symbols
sodium
hydroxide
is ionic:
Reactants:
2Na 4H
2O
what are the formulae of its ions?
Products:+ 2Na 4H- 2O
Na and OH
It’s balanced!
2 Na + 2 H2O  2 NaOH + H2
Original slide
prepared for the
References
First example, with symbols only:
Frank Harriss of Malvern College
Second example, with text prompts: Steve Lewis
Original slide
prepared for the