If a chemist calculates the maximum amount of product that could be obtained in a chemical reaction, he or she is calculating the
theoretical yield
mole ratio
actual yield
percentage yield
2. Multiple Choice
45 seconds
1 pt
What is the measured amount of a product obtained from a chemical reaction?
mole ratio
theoretical yield
percentage yield
actual yield
3. Multiple Choice
1 minute
1 pt
Mole ratios are obtained from the
balanced chemical equation
periodic table
molar mass
4. Multiple Choice
1 minute
1 pt
What is the mole ratio of H2O to H3PO4 in the following chemical equation? P4O10 + 6 H2O --> 4 H3PO4
6:4
4:6
1:3
3:1
5. Multiple Choice
1 minute
1 pt
2Al + 3H2SO4 -> Al2(SO4)3 + 3H2 How many grams of aluminum sulfate would be formed if 250g H2SO4 completely reacted with aluminum?
0.85 g
290 g
450 g
870 g
6. Multiple Choice
5 minutes
1 pt
For the reaction represented by the equation Cl2 + 2KBr → Br2 + 2KCl, how many grams of potassium chloride can be produced from 356 grams potassium bromide?
749 g
225 g
479 g
814 g
7. Multiple Choice
45 seconds
1 pt
When does a chemical reaction stop?
When the lab is finished
When the excess reactant is used up
When the limiting reactant is used up
Chemical reactions never stop
8. Multiple Choice
5 minutes
1 pt
Identify the limiting reagent when 6.00 g HCl combines with 5.00 g Mg to form MgCl2.
Mg + 2HCl --> MgCl2 + H2
Mg
H2
MgCl2
HCl
9. Multiple Choice
1.5 minutes
1 pt
How many grams are in 7.8 moles of NaCl?
476 grams
460 grams
452 grams
462 grams
10. Multiple Choice
1 minute
1 pt
Balance the following reaction :
CaC₂(s) + H₂O(l) --> C₂H₂(g) + Ca(OH)₂(aq)
1,2,2,2
1,2,1,1
2,1,1,1
2,1,2,1
11. Multiple Choice
1 minute
1 pt
Using the following equation: Fe2O3(s) + 3H2(g) → 2Fe(s) + 3H2O(l) How many moles of iron can be made from 6 moles H2?
4 moles Fe
6 moles Fe
9 moles Fe
2 moles Fe
12. Multiple Choice
5 minutes
1 pt
Identify the limiting reagent when 6.00 moles HCl combines with 5.00 moles Mg to form MgCl2.
1 Mg + 2 HCl --> 1 MgCl2 + 1 H2
Mg
H2
MgCl2
HCl
13. Multiple Choice
30 seconds
1 pt
9. Complete the equation for the percent yield of a chemical reaction: Percent yield=(________)÷(________)×100%
actual yield; theoretical yield
theoretical yield; actual yield
14. Multiple Choice
5 minutes
1 pt
11. LiOH + KCl → LiCl + KOH
b) I actually produced 6 grams of lithium chloride and I began this reaction with 20 grams of lithium hydroxide. What is my percent yield?
16.9%
5.91%
1.88%
12.3%
15. Multiple Choice
5 minutes
1 pt
Fe (s) + S (l) --> FeS (s) In the experiment above, 7.62 g of Fe are allowed to react with 8.67 g of S. How much FeS is formed?