Lesson 4.3.3.1
4.3.3.1 Percentage yield Quiz: AQA Chemistry, Unit 3
20 questions
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Lesson 4.3.3.1, Percentage yield: 20 multiple choice questions for the AQA GCSE Chemistry (8462), Unit 3: Quantitative chemistry, written with Revision Ninja.
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The 20 questions
-
What does percentage yield compare the actual product mass to?
- Reactant mass
- Theoretical maximum
- Total volume
- Atom economy
-
Why might a chemical reaction not produce the calculated maximum mass?
- Catalyst added
- Atomic mass
- Reversible reaction
- High temperature
-
When is some product typically lost during a chemical preparation?
- During mixing
- During separation
- During weighing
- During heating
-
Actual mass is 8 g and theoretical mass is 10 g. What is the percentage yield?
- 10%
- 20%
- 125%
- 80%
-
Theoretical mass is 25 g and actual mass is 20 g. What is the percentage yield?
- 5%
- 20%
- 125%
- 80%
-
Actual mass is 45 g and theoretical mass is 60 g. What is the percentage yield?
- 75%
- 133%
- 15%
- 25%
-
What does a percentage yield of 100% indicate?
- Maximum yield
- Zero waste atoms
- Fast reaction
- No reactants left
-
A reaction has theoretical yield 40 g and actual yield 30 g. What is the percentage yield?
- 75%
- 133%
- 33%
- 30%
-
A reaction should make 60 g of product but only 45 g is obtained. What is the percentage yield?
- 45%
- 75%
- 133%
- 25%
-
The theoretical MgO mass is 40 g and the actual mass is 32 g. What is the percentage yield?
- 80%
- 40%
- 60%
- 125%
-
A student expects 200 g of product but collects 180 g. What is the percentage yield?
- 111%
- 180%
- 90%
- 20%
-
A theoretical yield is 50 g and the percentage yield is 60%. What is the actual mass?
- 83 g
- 30 g
- 50 g
- 20 g
-
A theoretical yield is 200 g and the percentage yield is 90%. What is the actual mass?
- 220 g
- 90 g
- 180 g
- 20 g
-
What causes the actual yield to be less than the theoretical maximum?
- Atom creation
- Incomplete reactions
- Exothermic energy
- Mass destruction
-
How does the actual yield of a chemical reaction compare to the theoretical yield?
- Always greater
- Always equal
- Less than or equal
- Double the theoretical
-
A reaction of 60 g gives an actual yield of 42 g. What is the percentage yield?
- 70%
- 60%
- 42%
- 140%
-
A student expects 40 g of product but collects 26 g. What is the percentage yield?
- 154%
- 26%
- 35%
- 65%
-
A product has an actual mass of 48 g and a theoretical mass of 64 g. What is the percentage yield?
- 133%
- 48%
- 33%
- 75%
-
A percentage yield of 35% gives an actual mass of 7 g. What is the theoretical mass?
- 35 g
- 7 g
- 3.5 g
- 20 g
-
What does percentage yield evaluate for industrial chemical processes?
- Reaction speed
- Activation energy
- Atom size
- Process efficiency
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