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QLDChemistryQuick questions
Unit 4: Structure, synthesis and design
Quick questions on Green chemistry principles and atom economy (QCE Chemistry Unit 4)
10short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is the 12 principles of green chemistry?Show answer
The principles were formulated by Anastas and Warner in 1998 and remain the QCAA-cited reference. A condensed version sufficient for QCAA EA:
What is atom economy?Show answer
Atom economy is the central quantitative measure in green chemistry. It compares the mass of desired product to the total mass of reactants in a balanced equation.
What are applying the principles?Show answer
Conventional petroleum diesel: high atom economy combustion but non-renewable feedstock (Principle 7 violation), high CO2 emissions (Principle 1 / 10), and energy-intensive refining (Principle 6).
What is ethanol by hydration of ethene?Show answer
CH2=CH2 + H2O -> CH3CH2OH. Mr(ethanol) = 46. Mr(reactants) = 28 + 18 = 46.
What is ethanol by fermentation of glucose?Show answer
C6H12O6 -> 2 CH3CH2OH + 2 CO2. Mr(2 ethanol) = 92. Mr(glucose) = 180.
What is esterification of ethanoic acid with ethanol?Show answer
CH3COOH + CH3CH2OH -> CH3COOCH2CH3 + H2O. Mr(ester) = 88. Mr(reactants) = 60 + 46 = 106.
What is saponification of ethyl ethanoate with NaOH?Show answer
CH3COOCH2CH3 + NaOH -> CH3COONa + CH3CH2OH. Two products of comparable mass; if sodium ethanoate is the target, atom economy = 82 / 128 = 64 percent. If both products are desired (industry), atom economy is effectively 100 percent.
What is q1?Show answer
State three of the twelve principles of green chemistry. [3 marks]
What is q2?Show answer
Calculate the atom economy for . [3 marks]
What is q3?Show answer
A pharmaceutical synthesis has yield and atom economy . (a) Distinguish yield from atom economy. (b) Calculate kg of product from feed.