Download MOLE CONCEPT REVIEW

Do Now 11/3/14
 Dimensional analysis is a problem solving method we used in Unit 1!
We will be revisiting it today.
1.
2.
Using dimensional analysis, solve the following
problem:
How many seconds are in 34.2 minutes?
Round your answer above to the correct number of
sig figs!!
 3. What numbers do you think the following words represent?
 a. Pair
d. Gross
 b. Dozen
e. Gig
 c. Score
By the end of the class period I will
be able to…
Define the term “mole”
Use the concept of mole to
convert between grams
and moles of an element.
Topic #1
Words that stand
for numbers
Pair = ?
Dozen = ?
Score = ?
Gross = ?
Gig = ?
Pair = 2
Dozen = ?
Score = ?
Gross = ?
Gig = ?
Pair = 2
Dozen = 12
Score = ?
Gross = ?
Gig = ?
Pair = 2
Dozen = 12
Score = 20
Gross = ?
Gig = ?
Pair = 2
Dozen = 12
Score = 20
Gross = 144
Gig = ?
Pair = 2
Dozen = 12
Score = 20
Gross = 144
Gig = 1,000,000,000
Pair = 2
Dozen = 12
Score = 20
Gross = 144
Gig = 1,000,000,000
Mole = ????
What is mole??
Mole: a unit of measurement
used in chemistry to express
amounts of a chemical substance
‘Mole’ means 6.022x1023
Avogadro’s Number
6.022 x 1023 is also
called “Avogadro’s
Number”
The mole is a HUGE number:
602,200,000,000,000,000,000,000
A mole of sand grains:
Would cover all of the land
in the continental United
States
to a depth of 3 inches!
A mole of
marshmallows:
Would cover all of the land
in the continental United
States
to a depth of 600 miles!
A mole of baseballs
If you wanted to make a bag to
keep these baseballs in…
The bag would need to be
the size of our earth.
If a mole of pennies:
Was divided amongst every
person on earth
Each person would receive
1.5 x 1014 pennies
That Means:
Each person could spend:
One million dollars a
day for the next four
thousand years!
Conclusion:
A MOLE is a really really
really really really really
really really really large
amount.
Stop and Jot
How would you
explain the definition
of ‘mole’ to a 5th
grader?
Representative Particle
A representative particle is the
simplest unit of any substance.
There are 6.022 x 1023
representative particles in a mole
of any substance.
Representative Particles
For an
element…
For an ionic
compound…
For a covalent
compound…
An atom
A formula
unit
A
molecule
Example:
Au or O2
Example:
NaCl
Example:
H2O
So, what’s the representative
particle in…
A glass of water?
So, what’s the representative
particle in…
A roll of quarters?
Comparing Moles of Quarters
and Dimes
Compare a mole of dimes to a mole of
quarters.
What things would be the same? What
would be different?
Done early? Try to calculate how much
money each would be!
Dimensional Analysis
a problem solving
method that allows
for conversion of one
unit to another
Conversion Factor:
ratios used to convert
a measured quantity
to a different unit of
measurement
The MOLE
Equivalence Statement
6.022x1023
atoms =
an element’s mass #
1 mole =
in grams
The MOLE
Equivalence Statement
6.022x1023
atoms =
an element’s mass #
1 mole =
in grams
What does equivalence
statement mean?
Complete the following
equivalence statement:
1 Dozen = 12 items
Steps to convert:
1. Write what you are given
(including units).
2. Write the unknown (what you
are trying to calculate).
3. Create a conversion factor that
has the given units on the
denominator and the unknown
units on the numerator.
Moles to Atoms
Atoms to Moles
1 mole of = 6.022x1023 atoms = an element’s mass #
atoms
in grams
How many atoms are in a sample
of 8.31 moles of calcium?
1 mole of = 6.022x1023 atoms = an element’s mass #
atoms
in grams
How many moles are in a sample
of 2.25 x 1023 atoms of neon?
1 mole of = 6.022x1023 atoms = an element’s mass #
atoms
in grams
How many atoms are in a sample
of 3.15 moles of phosphorus?
1 mole of = 6.022x1023 atoms = an element’s mass #
atoms
in grams
How many moles are in a sample
of 4.10 x 1024 atoms of potassium?
Moles to Grams
Grams to Moles
1 mole of = 6.022x1023 atoms = an element’s mass #
atoms
in grams
How many moles are in a sample
of 4.55 grams of carbon?
6.022x1023 atoms = 1 mole =
an element’s mass #
in grams
How many grams of carbon are in
a 12.24 mole sample of carbon?
6.022x1023 atoms = 1 mole =
an element’s mass #
in grams
How many grams of magnesium
are in 5.34 moles of magnesium?
6.022x1023 atoms = 1 mole =
an element’s mass #
in grams
How many moles of nitrogen are in
36.05 grams of nitrogen?
Atoms to Grams
Grams to Atoms
1 mole of = 6.022x1023 atoms = an element’s mass #
atoms
in grams
What is the mass of
1.47 x 1024 atoms of lead?
6.022x1023 atoms = 1 mole =
an element’s mass #
in grams
How many atoms of nickel are in
150.4 grams of nickel?
6.022x1023 atoms = 1 mole =
an element’s mass #
in grams
How many grams of bromine are
in 8.02 x 1023 ions of bromine?
1 mole of = 6.022x1023 atoms = an element’s mass #
atoms
in grams
How many atoms would you have
if you measured out 36.8 g of
sodium?
1 mole of = 6.022x1023 atoms = an element’s mass #
atoms
in grams
Assignment…
Molympics Prep Worksheet
1 mole of = 6.022x1023 atoms = an element’s mass #
atoms
in grams
1. What does “mole” mean in
chemistry?
2. What is Avogadro’s number?
3. What is the mass in grams of 0.338
moles of iron?