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
1 minute
1 pt
2 KClO3 → 2 KCl + 3 O2 How many moles of oxygen are produced when 6.7 moles of KClO3 decompose completely?
6.7 mol
1.0 mol
10.1 mol
4.5 mol
3. Multiple Choice
1 minute
1 pt
2Na + 2H2O → 2NaOH+ H2 How many grams of hydrogen are produced if 120 g of Na are available?
5.2 g
2.6 g
690 g
45 g
4. Multiple Choice
2 minutes
1 pt
What is the measured amount of a product obtained from a chemical reaction?
mole ratio
theoretical yield
percentage yield
actual yield
5. Multiple Choice
30 seconds
1 pt
2 CO (g) + O2(g) → 2 CO2 (g) In the formation of CO2 from CO and oxygen, how many Liters of CO2 are produced by the reaction of 8 mols of O2 with an excess of carbon monoxide?
0.178 L
358.4 Liters
704 grams
0.36 grams
6. Multiple Choice
1 minute
1 pt
SiO2 + 3C → SiC + 2CO I need to add 8 moles of Carbon to the reaction. How many grams of Carbon should I weigh?
96 g
0.67 g
2.67 g
48 g
7. Multiple Choice
1.5 minutes
1 pt
Cl2 + 2 KBr → Br2 + 2 KCl How many grams of potassium chloride can be produced from 356 g of chlorine and 356 g of potassium bromide?
749 g
223 g
479 g
814 g
8. Multiple Choice
2 minutes
1 pt
A chemist interested in the efficiency of a chemical reaction would calculate the
mole ratio
rate of reaction
percent yield
energy released
9. Multiple Choice
15 minutes
1 pt
What is a Excess Reagent?
amount you end with
what you run out of first
what you have left over
what you start with
10. Multiple Choice
1 minute
1 pt
CH4 + 2 O2 → CO2 + 2 H2O How many moles of carbon dioxide are produced from the combustion of 110 g of CH4?
13.7 mol
2.75 mol
6.11 mol
6.85 mol
11. Multiple Choice
30 seconds
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?
14.8 g
12.2 g
13.7 g
19.9 g
12. Multiple Choice
30 seconds
1 pt
Identify the limiting reagent when 6.00 g HCl combines with 5.00 g Mg to form MgCl2.