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Module 8: Applying Chemical Ideas
Quick questions on Designing a chemical synthesis explained: HSC Chemistry Module 8
6short 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 produced alongside the target?Show answer
Is the by-product valuable (then sell it), inert (then dump it), or hazardous (then treat it)? Atom economy is the percentage by mass of reactant atoms that end up in the product. 5.
What are reaction conditions?Show answer
Conditions set the scale of the engineering. The Haber process (450 degrees C, 200 atm) needs steel reactors with thick walls and energy-intensive compressors. Aspirin synthesis (70 degrees C, atmospheric pressure) runs in ordinary glass-lined reactors.
What is generic statements about "high temperature is bad"?Show answer
Not always. Some reactions need it, and at industrial scale heat is often recovered through heat exchangers. Specifics matter.
What is q1?Show answer
List four factors that a chemist must evaluate when designing an industrial synthesis. [4 marks]
What is q2?Show answer
A new synthesis offers 95 percent atom economy versus 60 percent for the existing route. Calculate the additional kilograms of useful product obtained from 100 kg of reagents and explain why atom economy matters for green chemistry. [3 marks]
What is q3?Show answer
Compare two routes to ethanol: fermentation of sugar versus hydration of ethene. (a) State one advantage of each. (b) Identify which is preferred for pharmaceutical-grade alcohol.
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