Vocabulary
When converting from moles of one substance to moles of another substance, use these big numbers to set up the conversion ratio.
What are . . .
the coefficients
4 Fe + 3 O2 --> 2 Fe2O3
When 0.5 moles of Fe react, this is how many moles of Fe2O3 would be produced.
What is . . .
0.25 moles Fe2O3
The reactant that gets completely used (and would give you a smaller yield) in a reaction is called this.
What is . . .
the limiting reactant
This is the formula for calculating % yield
What is . . .
(Actual/Theoretical) x 100
This is how you properly spell the name of the current month of the year.
What is . . .
February
(must have capital letter F)
This branch of chemistry studies the quantities of matter in a chemical reaction.
What is . . .
stoichiometry
N2 + 3 H2 --> 2 NH3
This is how many moles of NH3 can be produced from 4 moles of H2.
What is . . .
2.67 moles NH3
Ronald has 20 hamburger patties and 16 buns. If he makes double burgers (2 patties per burger), this is his limiting reactant.
What is . . .
the hamburger patties
Betty expected to bake 36 cookies, but after her little brother ate some cookie dough, she only ended up with 32. This is her % yield of cookies.
What is . . .
about 89%
This is a name of one of the starting quarterbacks who will be playing in the Super Bowl on Sunday.
Who is . . .
Patrick Mahomes II
or
Jalen Hurts
After completing a chemical reaction, you measure the amount of product that you were able to produce. This term describes the amount that was really made.
What is . . .
the actual yield
2 KClO3 --> 2KCl + 3 O2
This is how many grams of O2 gas are produced from the decomposition of 12.25 g of KClO3.
(Molar masses: KClO3 = 122.55 g/mol O2 = 32 g/mol)
What is . . .
4.8 g O2
In the reaction for the production of water:
2H2 + O2 --> 2H2O,
this is the limiting reactant if 0.5 mol H2 and
0.5 mol O2 are combined and allowed to react.
What is...
H2?
Lucy calculated that her theoretical yield of silver would be 1.40 g. She actually obtained 1.36 g. This is her % yield.
What is . . .
97%
This is a name of one of the famous people whose birthday occurred in this month causing it to be considered a time to celebrate Black History Month.
Who is . . .
Frederick Douglas, or Rosa Parks, or
Abraham Lincoln (due to signing Emancipation Proclamation)
When completing a chemical reaction, one reactant may be used up before the other. This term describes the reactant that will NOT be completely used. It will have some left over.
What is . . .
the excess reactant
CaCO3 --> CaO + CO2
This is how many grams of CaO are produced when 50g of CaCO3 decomposes completely.
What is . . .
28.1 g CaO
Zn + 2HCl --> ZnCl2 + H2
This is the limiting reactant if 65 g of Zinc react with 36 g of HCl.
What is . . .
HCl
Jacob determined that his % yield of silver during the lab was 87%. This could be a reason why he did not get 100% yield.
What is . . .*check each other for reasonable answers*
Examples: Chemical spills, he did not get all of the chemicals out of the test tube, there may have been silver remaining on the wire, etc.
According to candystore.com, this was the most popular Valentine's candy in Iowa in 2024.
NO looking it up before answering!
What is . . .
M & M's
This term describes the amount of product you expect to make in a chemical reaction.
What is . . .
the theoretical yield
Iron (II) nitrate reacts with potassium iodide to form potassium nitrate and iron (II) iodide. If 20 g of iron (II) nitrate is used in a reaction with excess potassium iodide, this is the mass of iron (II) iodide that is expected to form in the reaction.
What is...
34.4 g FeI2 expected to form?
(Balanced equation = Fe(NO3)2 + 2KI --> 2KNO3 + FeI2)
In the lab, 19.4 grams of aluminum hydroxide (Al(OH)3) and 32.1 grams of hydrochloric acid (HCl) are combined and complete a full reaction. This is the mass (in grams) of the product, aluminum chloride, that should form.
What is...
33.3 g AlCl3?
Balanced equation:
Al(OH)3 + 3HCl --> AlCl3 + 3H2O
Tony Stark is manufacturing Vibranium. The factory tells him that 1519 kg of Vibranium has been manufactured, and that the percent yield is 94%. Tony wants to know what the theoretical yield is.
What is 1616 kg?
This is the name of the groundhog who famously predicts the weather each Feb 2.
Who is . . .
Punxsutawney Phil