ppt

1. 1. What is the conservation of mass?
2. Why might the products of this chemical reaction
seem to lose mass?
CaCO3  CaO + CO2
120g
3. Describe the process of water purification
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The mass of the reactants and products are the same in a chemical reaction
.
The carbon dioxide gas will escape due to the open system
Water is filtrated to remove large insoluble material, aluminium sulfate is
used to clump together smaller material to allow it to settle, sand and gravel
filtration removes insoluble material. Chlorine is used to sterilise it.
The Mole Part I

2. The number of
moles, relative Mr
and mass can be
arranged in a
formula triangle.
F
I
S
Describe how
chemical amounts
are measured in
moles and how
one mole of any
substance is the
same amount
(Avogadro's
constant).
F
I
S
Use decimals,
percentages and
estimates
MS
Recognise and use
expressions in
standard form
MS
Change the subject
of an equation
MS
LO: Calculating the mole
DISCUSS
Key words: Avogadro’s constant, Relative atomic mass, relative molecular mass
Are there any words you know
that help us describe how many
of these objects are present?
PAIR
PAIR
DOZEN

3. LO: Describe the law of the conservation of mass
The big picture: “Atomic calculations”
Key words: Avogadro’s constant, Relative atomic mass, relative molecular mass
Level of Thinking Outcomes
Fluent The number of moles, relative Mr and mass can be arranged in a
formula triangle.
Independently
With support
Fluent Describe how chemical amounts are measured in moles and how one
mole of any substance is the same amount (Avogadro's constant).
Independently
With support
Fluent
“No problem! I can
help my friends if
necessary.”
Independently
“I can have a go and
get quite a way
without any support
or guidance, but
there are times
when I might need
to check a few
details. ”
With Support
“I can do it myself
but I may need to
ask my teacher
every now and
again when I get
stuck.”
Use decimals, percentages and
estimates
Recognise and use expressions
in standard form.
Change the subject of an
equation
The Mole Part I

4. The number of
moles, relative Mr
and mass can be
arranged in a
formula triangle.
F
I
S
Describe how
chemical amounts
are measured in
moles and how
one mole of any
substance is the
same amount
(Avogadro's
constant).
F
I
S
Use decimals,
percentages and
estimates
MS
Recognise and use
expressions in
standard form
MS
Change the subject
of an equation
MS
A mole is an amount of
things.
602,200,000,000,000,
000,000
(6.02 hexillion) things.

5. Technically
you can
have a
mole of
any
object…
A mole of doughnuts would be…
602,200,000,000,000,000,000 doughnuts.
A mole of socks would be…
602,200,000,000,000,000,000 socks.
A mole of moles would be…
602,200,000,000,000,000,000 moles.
The number of
moles, relative Mr
and mass can be
arranged in a
formula triangle.
F
I
S
Describe how
chemical amounts
are measured in
moles and how
one mole of any
substance is the
same amount
(Avogadro's
constant).
F
I
S
Use decimals,
percentages and
estimates
MS
Recognise and use
expressions in
standard form
MS
Change the subject
of an equation
MS

6. The number of
moles, relative Mr
and mass can be
arranged in a
formula triangle.
F
I
S
Describe how
chemical amounts
are measured in
moles and how
one mole of any
substance is the
same amount
(Avogadro's
constant).
F
I
S
Use decimals,
percentages and
estimates
MS
Recognise and use
expressions in
standard form
MS
Change the subject
of an equation
MS TASK
Using the rules below write a mole
(602,200,000,000,000,000,000) in standard index form.
But because a mole is such a large number chemists
often represent a mole of a chemical substance in
standard index form.
6.02 X 1023

7. Avogadro Constant
In one mole of a substance
there is always the same
number of particles
This number of particles is
called the Avogadro constant =
6.02x1023
The number of
moles, relative Mr
and mass can be
arranged in a
formula triangle.
F
I
S
Describe how
chemical amounts
are measured in
moles and how
one mole of any
substance is the
same amount
(Avogadro's
constant).
F
I
S
Use decimals,
percentages and
estimates
MS
Recognise and use
expressions in
standard form
MS
Change the subject
of an equation
MS

8. The number of
moles, relative Mr
and mass can be
arranged in a
formula triangle.
F
I
S
Describe how
chemical amounts
are measured in
moles and how
one mole of any
substance is the
same amount
(Avogadro's
constant).
F
I
S
Use decimals,
percentages and
estimates
MS
Recognise and use
expressions in
standard form
MS
Change the subject
of an equation
MS
One mole of different
chemical substances
occupy a different
amount of space
(volume).
Teacher demo

9. The number of
moles, relative Mr
and mass can be
arranged in a
formula triangle.
F
I
S
Describe how
chemical amounts
are measured in
moles and how
one mole of any
substance is the
same amount
(Avogadro's
constant).
F
I
S
Use decimals,
percentages and
estimates
MS
Recognise and use
expressions in
standard form
MS
Change the subject
of an equation
MS
TASK
Write down how the fruit below can be used
to model why a mole of titanium, carbon and
lithium occupy a different volume.
Ti C Li

10. Pb
The Mole
• 1 mole of an element is it’s Relative
Atomic Mass expressed in grams
• 1 Mole of carbon = 12g
• 1 Mole of aluminium = 27g
• 1 Mole of lead = 207g
The number of
moles, relative Mr
and mass can be
arranged in a
formula triangle.
F
I
S
Describe how
chemical amounts
are measured in
moles and how
one mole of any
substance is the
same amount
(Avogadro's
constant).
F
I
S
Use decimals,
percentages and
estimates
MS
Recognise and use
expressions in
standard form
MS
Change the subject
of an equation
MS
C
Al

11. The Mole
• 1 mole of an compound is it’s Relative
Molecular Mass expressed in grams
• 1 Mole of Water = 18g
• 1 Mole of Carbon Dioxide = 44g
• 1 Mole of Ethene = 28g
• 1 mole of chlorine (Cl2) = 70g
(however we will learn about the molarity of gases later…)
The number of
moles, relative Mr
and mass can be
arranged in a
formula triangle.
F
I
S
Describe how
chemical amounts
are measured in
moles and how
one mole of any
substance is the
same amount
(Avogadro's
constant).
F
I
S
Use decimals,
percentages and
estimates
MS
Recognise and use
expressions in
standard form
MS
Change the subject
of an equation
MS

12. Mr x Moles
Mass
(g)
TASK
There is a relationship between the molecular mass, moles
and mass.
The number of
moles, relative Mr
and mass can be
arranged in a
formula triangle.
F
I
S
Describe how
chemical amounts
are measured in
moles and how
one mole of any
substance is the
same amount
(Avogadro's
constant).
F
I
S
Use decimals,
percentages and
estimates
MS
Recognise and use
expressions in
standard form
MS
Change the subject
of an equation
MS
Mr Moles (with
a mass on his
head)
Mr x Moles
Mass
(g)

13. The number of
moles, relative Mr
and mass can be
arranged in a
formula triangle.
F
I
S
Describe how
chemical amounts
are measured in
moles and how
one mole of any
substance is the
same amount
(Avogadro's
constant).
F
I
S
Use decimals,
percentages and
estimates
MS
Recognise and use
expressions in
standard form
MS
Change the subject
of an equation
MS
Worked example:
How many moles of water is inside this bottle?
How would you find the mass of the water?
1) Place the bottle on the weighing scales to find the mass of the water and
the bottle
Total Mass = 531g
2) The dry plastic bottle has a mass of 31g without the water. To find the mass
of water you must subtract the bass of the bottle away from the total mass.
531-31 = 500g of water
How would you find the molecular mass (Mr) of water?
H2O = (2xH) + (1xO)
=(2x1) + 1x16)
Mr = 18
.
How would you find the number of moles (Mol) of water?
Moles = mass/Mr
= 500/18
= 27.8 moles
Q What does 27.8 moles
mean?

14. 1. A mole is 6.02 x10-23
2. One mole of any substance is always the same
quantity e.g. 6.02x1023
3. One mole of any substance is always the same
volume and mass
4. One mole of iron is it’s relative atomic mass (55.8)
in grams.
5. One mole of Lead will have a higher mass than one
mole of Lithium.
6. Moles = Mr /mass
T
T
T
T
T
T
F
F
F
F
F
F
F
H
F
T
T
F
Quick Six: True or false?
The number of
moles, relative Mr
and mass can be
arranged in a
formula triangle.
F
I
S
Describe how
chemical amounts
are measured in
moles and how
one mole of any
substance is the
same amount
(Avogadro's
constant).
F
I
S
Use decimals,
percentages and
estimates
MS
Recognise and use
expressions in
standard form
MS
Change the subject
of an equation
MS
TASK: describe why statement 1,3 and 6 are false.