Lesson 4.3.3.2
4.3.3.2 Atom economy Quiz: AQA Chemistry, Unit 3
20 questions
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Lesson 4.3.3.2, Atom economy: 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 atom economy measure in a chemical reaction?
- Reaction speed
- Energy change
- Solvent volume
- Reactants to products
-
What value forms the numerator in a percentage atom economy calculation?
- Mr of all reactants
- Actual yield in grams
- Total mass of by-products
- Mr of desired product
-
Why is high atom economy favoured in industrial chemical processes?
- Faster reactions
- Simpler apparatus
- Economic reasons
- Lower temperatures
-
A + B -> C, where C has Mr 60 and the reactants A and B total Mr 60. What is the atom economy?
- 66%
- 50%
- 100%
- 33%
-
CaCO3 -> CaO + CO2 with CaO as the desired product. What is the atom economy? (CaO = 56, CaCO3 = 100)
- 56%
- 100%
- 44%
- 12%
-
A desired product has Mr 80 and the reactants total 200. What is the atom economy?
- 250%
- 80%
- 40%
- 120%
-
Calcium carbonate decomposes: CaCO3 -> CaO + CO2. What is the atom economy (%) for making CaO? (Ca = 40, C = 12, O = 16)
- 100%
- 28%
- 44%
- 56%
-
The desired product has Mr 36 and the reactants total 48. What is the atom economy?
- 36%
- 48%
- 133%
- 75%
-
For C + O2 -> CO2, what is the atom economy for CO2? (C = 12, O2 = 32, CO2 = 44)
- 100%
- 50%
- 27%
- 73%
-
In Fe2O3 + 3CO -> 2Fe + 3CO2, what is the atom economy for iron? (Fe2O3 = 160, CO = 28, Fe = 56)
- 45.9%
- 35.0%
- 91.8%
- 70.0%
-
A desired product has Mr 18 and all the reactants total 20. What is the atom economy?
- 18%
- 20%
- 110%
- 90%
-
What does an atom economy of 100% signify about a chemical reaction?
- Reversible reaction
- 100% reaction rate
- Maximum actual yield
- No by-products formed
-
What unit is atom economy given in?
- Moles
- Grams
- Dm3
- Percentage
-
A reaction forms a desired product (Mr 60) and a by-product (Mr 40) from reactants totalling 100. What is the atom economy?
- 40%
- 100%
- 50%
- 60%
-
How is atom economy fundamentally different from percentage yield?
- Measured experimentally
- Always equals 100%
- Based on actual mass
- Calculated from equation
-
The desired product has Mr 44 and the reactants total 88. What is the atom economy?
- 200%
- 44%
- 50%
- 88%
-
Desired product Mr 100 and by-product Mr 25 form from reactants totalling 150. What is the atom economy?
- 25%
- 66.7%
- 83.3%
- 16.7%
-
Which type of chemical reaction typically has an atom economy of 100%?
- Neutralisation reaction
- Addition reaction
- Substitution reaction
- Thermal decomposition
-
The desired product has Mr 17 and the reactants total 34. What is the atom economy?
- 34%
- 17%
- 200%
- 50%
-
What is the economic benefit of a high atom economy?
- Less waste produced
- Faster reaction rate
- Higher activation energy
- Lower temperature needed
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