Playbook
Green Chemistry and Nanochemistry
63 q - 1.10/paper - never HARD, and rising two years running. The principles, atom economy and nanostructures by dimension.
- Questions in the bank
- 63
- q/paper (2025–26 papers)
- 1.10
- Tagged HARD
- 0%
- Subtopics
- 2
Strand: Recall
When you’ll see it
A principle of green chemistry, a percentage atom economy, a green solvent, or a nanostructure's dimension, synthesis or characterisation.
How this chapter is tested
63 q at 1.10 a paper, and never a HARD question. It has risen two years running: 0.67 a paper across 2023-24, 1.00 in 2025 and 1.15 in 2026, which is what made it a playbook. Green chemistry (36 q): the principles, percentage atom economy, and safer solvents such as water and supercritical CO₂.
Nanochemistry (27 q): nanostructures classified by dimension (the textbook lists quantum dots and nano-rings as zero-dimensional), the sol–gel route, and the instruments that characterise a nanomaterial.
The sub-skills
The distinct skills inside the chapter, in the order to learn them.
Atom economy
% atom economy = mass of the desired product ÷ total mass of all reactants × 100. Every reactant counts, including the one that ends in the by-product.
The principles
Prevent waste rather than treat it, maximise atom economy, use safer solvents, save energy, prefer renewable feedstocks and catalysts, design products to degrade.
Nanostructures
Classified by how many dimensions lie outside the nanoscale: quantum dots and nano-rings zero, nanotubes and nanowires one, thin films two.
Sol–gel synthesis
Precursor to sol to gel, then drying, then the final dehydration: the order of steps is what is asked.
Traps to expect
Distractor shapes this chapter reuses. The Traps page covers the patterns that cut across chapters.
Leaving a reactant out of the sum
For ethanol from chloroethane and KOH the denominator is 64.5 + 56 = 120.5, so the atom economy is 46 ÷ 120.5 = 38.2%. Dropping the KOH gives 71.3%, far too high.
Nano-rings as one-dimensional
A ring looks like a bent wire, but the textbook lists nano-rings with quantum dots as zero-dimensional.
Learn it before you drill it
This chapter has full teaching notes — foundations, worked examples, self-checks and a per-subtopic mastery checkpoint. Read the notes once, then drill subtopic by subtopic below.
Green Chemistry and Nanochemistry notesDrill every green chemistry and nanochemistry question
63 questions from the bank, scoped to 2 bundled subtopics.
Drill one subtopic at a time
The 2 subtopics this playbook covers, in catalog order.
Related playbooks
Often paired with this one — the technique, the trap or the taxonomy overlaps. Drill these next.