What green chemistry is, its main principles including atom economy, and examples that reduce hazardous substances and waste.
5 narrated scenes. Press play, listen and read along — the points appear as they are explained. Use ‹ Prev / Next › or the scene bar to jump to any scene.
The best way to deal with waste is not to make it. Green chemistry designs processes and products so that pollution never starts.
Narration uses your device’s built-in voice. No sound? Switch to “Captions only” — the captions advance on their own.
Copy these into your notebook in your own words — that is how they stick.
Design of products/processes that reduce or eliminate hazardous substances.
Prevent waste; atom economy; safer chemicals and solvents; energy efficiency; renewable feedstocks; biodegradable design.
(M desired product ÷ M all reactants) × 100.
100% atom economy.
HFCs for CFCs; biodegradable plastics; biofuels; enzymes; recycling.
Bagasse, biogas, solar energy.
Less pollution and waste.
Research and equipment.
3 quick games on this lesson. Earn XP and badges as you play — your best score for each game is saved. Games are for practice and do not change your exam readiness. More games in the Chemistry Arcade.
8 items modelled on real CSEC Paper 1 questions. Choose one answer for each, then check. Aim for 80% or better. Work each item on paper first.
Write full answers, then reveal the mark scheme and tick the points you earned (13 marks in total). Show all your working — method marks count. Your answers are saved on this device.
Question 1 [13 marks]
Chemists today try to design processes that are safe for people and the environment.
(a) (a) Define green chemistry. [2]
(b) (b) State three principles of green chemistry. [3]
(c) (c) Define atom economy and calculate it for CaCO₃ → CaO + CO₂ (Ca = 40, C = 12, O = 16) for CaO. [4]
(d) (d) State why addition reactions have a high atom economy. [1]
(e) (e) Give two examples of green chemistry practised in the Caribbean. [2]
(f) (f) Suggest one possible disadvantage of adopting green chemistry. [1]
Find these in your own past-paper booklets for extra timed practice. Items above are written in the style of these papers; any adapted from a specific question say so.