Tuesday, Oct. 15 th : “A” Day Wednesday, Oct. 16 th : “B” Day Agenda Ch 9 review: Questions/problems? Jeopardy Review Homework: Vocabulary Crossword Puzzle Next time: Ch 9 test: “Stoichiometry” Ch 9 test: “Stoichiometry” Concept review packets/puzzles due 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 6 th question is also in the game, just not in this category…
StoichiometryCh.#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 Critical Thinking
Calculations!
Movie Quotes Movie Quotes
$100 $200 $300 $400 $500 Vocabulary $100 $200 $300 $400 $500 Moles/Grams Volume/Particles $100 $200 $300 $400 $500 Critical Thinking $100 $200 $300 $400 $500 Calculations! $100 $200 $300 $400 $500 Movie Quotes DD FJ
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% The ratio of the actual yield to theoretical yield X 100% Answer…
Percentage Yield 500
Answer… The ratio of Fe to Fe 2 O 3 in the reaction below is Fe 2 O Al 2 Fe + Al 2 O 3
100 2 : 1 (2 to 1)
Answer… To convert from moles of what you’re given to moles of what you want, what do you need to use?
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…
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 H 2 O for the following reaction: Mg 3 N H 2 O 3 Mg(OH) NH 3 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, SrCO 3, according to the following equation: SrCl 2 + Na 2 CO 3 2 NaCl + SrCO 3 a) What type of reaction was this? b) Why was the SrCO 3 rinsed in the funnel after filtering? Answer…
a) Double displacement b) The SrCO 3 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? N H 2 2 NH 3 Answer…
468 mol H 2 100
How many grams of Al are needed to completely react with 135 g of Fe 2 O 3 ? Fe 2 O Al 2 Fe + Al 2 O 3 Answer…
45.6 g Al 200
How many mL of C 5 H 8 can be made from 366 mL of C 5 H 12 ? (Density of C 5 H 8 = g/mL) (Density of C 5 H 12 = g/mL) C 5 H 12 C 5 H H 2 Answer…
315 mL C 5 H 8 300
How many grams of C 5 H 8 form from 1.89 X molecules C 5 H 12 ? C 5 H 12 C 5 H H 2 Answer…
214 g C 5 H 8 400
Find the limiting reactant, the theoretical yield, and the percentage yield if 14.0 g N 2 are mixed with 9.0 g H 2 and 16.1 g NH 3 form. N H 2 2 NH 3 Answer…
N 2 is limiting reactant Theoretical yield = 17.0 g NH 3 Percentage yield = 94.7% 500
Answer… Listen… What movie is this quote from?
“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) “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 Daily Double
FINAL JEOPARDY
CATEGORY: Theoretical Yield How much do you want to wager? Proceed…
Identify the limiting reactant and theoretical yield of H 3 PO 3 if 225 g of PCl 3 is mixed with 123 g of H 2 O. PCl 3 + 3H 2 O H 3 PO 3 +3HCl Proceed…
Limiting Reactant = PCl 3 Theoretical Yield = 134 g H 3 PO 3 Proceed…
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Credits Created by: Chad Kafka, Business Teacher Huntley High School Jeopardy sound effects used solely for the purpose of fun, entertainment, and education and NOT for profit.