Chem Stoichiometry Percent Yield

Quiz
•
Science
•
10th Grade
•
Hard
Standards-aligned
Lisa Thompson
FREE Resource
15 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
When reacting Na with Cl2, we calculated that the theoretical yield should be 13 grams. Our actual yield was 12.5 grams. What is the percent yield?
90.4%
104%
96%
1.0%
Answer explanation
Tags
NGSS.HS-PS1-7
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Theoretical yield = 73g
Actual yield = 62g
Calculate the percent yield.
2%
120%
85%
76%
Answer explanation
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What does percent yield indicate?
The amount of product we should get
The efficiency of the lab
The amount of product we actually got
nothing
Answer explanation
% Yield tells the efficiency of your work - how close you were to the theoretical value you should have gotten
Tags
NGSS.HS-PS1-6
NGSS.HS-PS1-7
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Some product may be lost during filtering causing your actual yield to be less than your theoretical yield.
true
false
Answer explanation
Anytime you "lose" product, your actual will be less than your theoretical b/c you lost some of the product.
Your actual will be higher than your theoretical if you add substances that are not the product - example measuring the filter paper & product, and not just the product.
Tags
NGSS.MS-PS1-5
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What is a limiting reactant?
the reactant that determines how much product can be made
the reactant that is in excess
the product that you can make the most of
the amount of reactants that react with each other
Answer explanation
The limiting reactant LIMITS the amount of product that can be made, b/c the rxn stops when the limiting runs out...meaning no more product is made.
Tags
NGSS.HS-PS1-7
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
When 12 moles of O2 reacts with 1.1 mole of C10H8 what is the limiting reactant? C10H8 + 12 O2 --> 10 CO2 + 4 H2O
Oxygen
C10H8
Water
Carbon Dioxide
Answer explanation
Tags
NGSS.HS-PS1-7
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
2H2 + O2 → 2H2O
How many moles of oxygen are consumed if 8 moles H2 are used?
2
4
6
8
Answer explanation
H2 has a 2:1 ratio with oxygen (from the coefficients of the balanced equation)
So 8 moles of H2 means 4 moles of O2 are used.
2:1 = 8:X = 8:4
Tags
NGSS.HS-PS1-7
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