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Y8: Balancing Equations
Y9: Balancing Equations and chemical formula
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Slide 1:
Slide
Chemistry
Lower Secondary (Key Stage 3)
This lesson contains
29 slides
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interactive quizzes
,
text slides
and
1 video
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Items in this lesson
Y9: Balancing Equations and chemical formula
.
Slide 1 - Slide
Slide 2 - Slide
In a balanced equation the number of atoms of each element is the same on each side of the arrow.
These are hydrogen atoms
a
This + sign means "reacts with" or "bonds with"
b
These are oxygen atoms
C
These are water molecules
d
Slide 3 - Slide
Here we see 4 hydrogen (white) on the left and 2 oxygen (red). On the right we still see 4 Hydrogen and 2 oxygen.
These are hydrogen atoms
a
This + sign means "reacts with" or "bonds with"
b
These are oxygen atoms
C
These are water molecules
d
Slide 4 - Slide
All that changed was the arrangement of the hydrogen and oxygen.
These are hydrogen atoms
a
This + sign means "reacts with" or "bonds with"
b
These are oxygen atoms
C
These are water molecules
d
Slide 5 - Slide
Is this equation balanced?
A
Yes it all the same either side of the arrow
B
No there's more blues on the left than the right.
Slide 6 - Quiz
How can I balance this equation
A
Double the products (right) and the pinks (left)
B
Split the blues and throw one away (left)
Slide 7 - Quiz
Is this equation balanced?
A
Yes
B
No
Slide 8 - Quiz
How many oxygen atoms are there in each of these substances?
Substance
Oxygen Atoms
O
HNO
C H O
MgO
CO
MgCO
2
2
3
3
6
12
6
1
2
2
3
3
6
Slide 9 - Drag question
Is this equation balanced? (Count the colour dots)
A
No
B
Yes
Slide 10 - Quiz
Is this equation balanced?
A
Yes there's one red and 4 blue on each side
B
No they are in different arrangements.
Slide 11 - Quiz
To balance an equation we can multiply any of the existing substances until the number of atoms is equal.
I have 1 more blue here than on the right
I have one more orange here than on the right
If I double up this molecule the equation will balance.
Slide 12 - Slide
Drag up one box (
one
molecule) so that the equation will be balanced
Slide 13 - Drag question
Drag one box showing
one
molecule to balance the equation.
Slide 14 - Drag question
Drag two boxes (move
two
molecules) to balance the equation.
Slide 15 - Drag question
Add
two
molecules to balance the equation.
Slide 16 - Drag question
Add
three
molecules to balance the equation.
Slide 17 - Drag question
Add
two
molecules to balance the equation.
Slide 18 - Drag question
Naming compounds
One oxygen atom = monoxide
Two oxygen atoms = dioxide
Three oxygen atoms = trioxide.
Slide 19 - Slide
Monoxide
Dioxide
Trioxide
Slide 20 - Drag question
Carbon dioxide
Not carbon dioxide
Slide 21 - Drag question
Drag the names into the balanced equation.
Carbon x 2
Oxygen x 2
Carbon monoxide x 2
Slide 22 - Drag question
The red is oxygen, the white is hydrogen
1 red 2 white
One carbon Two oxygens
1 black, 2 red
This has 3 red (oxygens) 2 white (Hydrogens) 1 black (Carbon)
This double arrow means the reaction can go forwards and backwards.
This reaction is reversible.
Slide 23 - Slide
What does this double arrow mean?
A
Two way street
B
Reversible reaction
Slide 24 - Quiz
How can we tell this reaction is balanced?
A
There are different atoms bonded together
B
There's the same number of atoms on both sides of the arrow.
Slide 25 - Quiz
What is the first step in balancing a chemical equation?
A
Identifying the catalyst
B
Measuring the volume of the reactants
C
Counting the number of atoms of each element
D
Determining the reaction rate
Slide 26 - Quiz
Slide 27 - Video
Hydrogen
Oxygen
Water
Slide 28 - Drag question
How many of each do we need to make it balance?
Just this pair
One more pair
One more molecule
Slide 29 - Drag question
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