STARTER Try to name the following compounds You have 5 minutes!
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Transcript of STARTER Try to name the following compounds You have 5 minutes!
STARTER
• Try to name the following compounds
• You have 5 minutes!
H NO3 Zn Cl2
H2 SO4 Cu Cl2
Ca (OH)2 Ca CO3
Ag Br Na OH
Ag2 O Ca SO4
Cu O Mg O
Ag NO3H Cl
Na2 SO4Na Cl
Balancing Equations
Everyone should:Be able to balance simple equations
Most people will:Balance equations using compounds like OH- NO3 -
SO4 2-
Some people will:Be able to balance equations with unusual compounds
The law of conservation of matter
• ATOMS CANNOT BE CREATED OR DESTROYED!
The idea of the famous scientist John Dalton in 1700's.
Hydrogen + chlorine hydrogen chloride
H2 + Cl2 HCl
Remember: Hydrogen and Chlorine are diatomic
+
REACTANTS
2 H atoms2 Cl atoms
PRODUCTS
1 H atom1 Cl atom
This is impossible as it implies that atoms have been destroyed.
What do we do?
We need to make the number of atoms equal on both sides of the equation, in order to get the equation to BALANCE.
Equation is now balanced, as there are the same number hydrogen atoms (2) and the same number of chlorine atoms (2) on the products and reactant side.
Firstly you need an equation with the correct “formulae” You’ll probably be given this in the question
Just like this one
Mg + O2 MgO
Then all you do is list the atoms that are involved on each side of the arrow
Mg + O2 MgO
Mg Mg O O
[1] Just count up the atoms on each side
Then start balancing:
Mg + O2 MgO
2
The numbers aren’t balanced, so make your adjustments:
And adjust totals
Mg + O2 MgO2
Mg 1 Mg 1 O 2 O
Mg 1 Mg 2 O 2 O 2
Mg + O2 MgO2
But the numbers still aren’t equal
2
And adjust totals again
NOW BOTH SIDES HAVE EQUAL NUMBERS OF ATOMS
WE SAY THAT THE EQUATION IS BALANCED!!
2
GROUP ACTIVITY: Try to balance these equations
You have 5 minutes!
[1] Na + Cl2 NaCl
[2] CH4 + O2 CO2 + H2O
[4] Al + O2 Al2O3
[3] Li + HNO3 LiNO3 + H2
Why didn’t anyone tell me it was so easy
to balance equations???!!!
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:
ExamplesIt’s best to balance using whole numbers
22
3 22
24
22