Tuesday, Oct. 15th: “A” Day
Wednesday, Oct. 16th: “B” Day
Agenda
Ch 9 review: Questions/problems?
Jeopardy Review
Homework: Vocabulary Crossword Puzzle
Next time:
Ch 9 test: “Stoichiometry”
Concept review packets/puzzles due
Ch 9 Review
Questions/problems?
Ch. 9 Short Answer Test
Questions
 The questions in the “critical
thinking” category are 5 of the 6
short answer questions that will
be on the chapter test…
 The 6th question is also in the
game, just not in this category…
Stoichiometry
Ch.#9
THE RULES:
• You will be in five teams
• The winning team will receive
mole money
• The host’s decisions are final
And now…here is the host of
Jeopardy…
Mrs. Elfline
Let’s Get Ready to play…
Today’s Categories are:
Vocabulary
Moles/Grams
Volume/Particles
Critical Thinking
Calculations!
Movie Quotes
Vocabulary
Moles/Grams
Volume/Particles
Critical
Thinking
Calculations!
Movie
Quotes
$100 $100 $100 $100 $100
FJ
$200 $200 $200 $200 $200
$300 $300 $300 $300 $300
$400 $400 $400 $400 $400
$500 $500 $500 $500 $500
DD
The substance not completely
used up in a chemical reaction
Answer…
Excess Reactant
100
The branch of chemistry that deals
with the relationship between
reactants and products in a
chemical reaction
Answer…
Stoichiometry
200
The substance that controls the
amount of product that can be
made
Answer…
Limiting Reactant
300
The measured amount of product
obtained from a chemical reaction
Answer…
Actual Yield
400
The ratio of the actual yield to
theoretical yield X 100%
Answer…
Percentage Yield
500
The ratio of Fe to Fe2O3 in the
reaction below is
Fe2O3 + 2 Al
2 Fe + Al2O3
Answer…
2:1
(2 to 1)
100
To convert from moles of what
you’re given to moles of what you
want, what do you need to use?
Answer…
Mole Ratio
(aka secret magic step)
200
How is density used in
stoichiometry problems?
Answer…
Use the density of the substance
to convert mL or liters of what
you’re given to grams and then to
moles. Then you can use the
mole ratio to convert to moles of
what you want to find.
300
What number do you need to
convert to number of
atoms/molecules/particles?
Answer…
23
10
6.022 X
particles/mole
(Avogadro’s number)
400
Why must a chemical equation be
balanced to solve stoichiometry
problems?
Answer…
The coefficients in a balanced
chemical equation show the
relative number of moles of each
substance. Mole ratios can then
be found and used to convert from
moles of one substance to moles
of another.
500
Why must a chemical equation be
balanced to solve stoichiometry
problems?
Answer…
The coefficients from a balanced
chemical equation represent the
relative number of moles and are
used in the mole ratio conversion
step.
100
Explain the difference between a
limiting reactant and an excess
reactant.
Answer…
The limiting reactant controls the
amount of product that can be
made and will be used up in the
reaction.
The excess reactant will be left
over after the reaction.
200
How does the actual yield of a
chemical reaction compare to the
theoretical yield?
Answer…
The actual yield is LESS than the
theoretical yield.
300
Explain why the conversion factor
3 g Mg(OH)2 cannot be used
6 g H2O
for the following reaction:
Mg3N2 + 6 H2O
3 Mg(OH)2 + 2 NH3
Answer…
The coefficients from the balanced
equation represent number of
moles of reactants and products –
NOT grams.
400
In the “Stoichiometry and
Gravimetric Analysis” lab, you
prepared strontium carbonate,
SrCO3, according to the following
equation:
SrCl2 + Na2CO3
2 NaCl + SrCO3
a) What type of reaction was this?
b) Why was the SrCO3 rinsed in the
funnel after filtering?
Answer…
a) Double displacement
b) The SrCO3 was rinsed in the
funnel to remove any NaCl that
may have been present.
500
How many moles of hydrogen are
needed to prepare 312 moles of
ammonia?
N2 + 3 H2
2 NH3
Answer…
468 mol H2
100
How many grams of Al are needed
to completely react with 135 g
of Fe2O3?
Fe2O3 + 2 Al
2 Fe + Al2O3
Answer…
45.6 g Al
200
How many mL of C5H8 can be
made from 366 mL of C5H12?
(Density of C5H8 = 0.681 g/mL)
(Density of C5H12 = 0.620 g/mL)
C5H12
C5H8 + 2 H2
Answer…
315 mL C5H8
300
How many grams of C5H8 form
from 1.89 X 1024 molecules C5H12?
C5H12
C5H8 + 2 H2
Answer…
214 g C5H8
400
Find the limiting reactant, the
theoretical yield, and the
percentage yield if 14.0 g N2 are
mixed with 9.0 g H2 and 16.1 g
NH3 form.
N2 + 3 H2
2 NH3
Answer…
N2 is limiting reactant
Theoretical yield = 17.0 g NH3
Percentage yield = 94.7%
500
Listen…
What movie is this quote from?
Answer…
“The Wizard of Oz”
“I’ll get you my pretty, and your
little dog too!”
(The wicked witch of the west
talking to Dorothy)
100
Listen…
What movie is this quote from?
Answer…
“Toy Story”
“reach for the sky”
(What Woody says when his string
is pulled)
200
Listen…
What movie is this quote from?
Answer…
“Dodgeball”
“Nobody makes me bleed my own
blood…nobody!”
(What White Goodman, played by
Ben Stiller, says after Taylor
makes him bleed.)
300
Listen…
What movie is this quote from?
Answer…
“Shrek”
“I’m not a puppet, I’m a real boy!”
(Pinocchio trying to convince himself
that he’s a real boy)
400
Listen…
What movie is this quote from?
Answer…
“Jaws”
“You’re gonna need a bigger boat
right?”
(What sheriff Martin Brody says
after he sees the size of the shark
that’s terrorizing the citizens of
Amity)
500
Daily Double
How much do you want
to wager?
Daily Double
FINAL
JEOPARDY
CATEGORY:
Theoretical
Yield
How much do you want
to wager? Proceed…
Identify the limiting reactant
and theoretical yield of H3PO3
if 225 g of PCl3 is mixed with
123 g of H2O.
PCl3 + 3H2O
H3PO3 +3HCl
Proceed…
Limiting Reactant =
PCl3
Theoretical Yield =
134 g H3PO3
Proceed…
Thanks for
PLAYING!
Credits
Created by:
Chad Kafka, Business Teacher
Huntley High School
chad@kafkaproductions.com
Jeopardy sound effects used solely for the purpose of fun,
entertainment, and education and NOT for profit.