Green Chemistry
Green chemistry reduces hazard and waste.
About this topic
Green chemistry designs chemical products and processes that reduce or eliminate hazardous substances. Its twelve principles include preventing waste, maximising atom economy, using safer solvents, designing for energy efficiency, using renewable feedstocks, employing catalysts instead of reagents, and designing products that degrade after use.
Atom economy is (mass of desired product ÷ total mass of reactants) × 100, and shows how much of the starting material ends up in the product. Addition reactions have 100 percent atom economy, while many substitution reactions waste atoms as by-products. Other measures include the E factor, the mass of waste per mass of product. Greener options use water or supercritical CO2 instead of toxic solvents, enzymes at room temperature, and renewable feedstocks like plant sugars for plastics.
Example: the synthesis of ibuprofen was redesigned from six steps with about 40 percent atom economy to three steps with about 77 percent, saving thousands of tonnes of waste. Dry cleaning with liquid carbon dioxide replaces perchloroethylene, and biodegradable plastics such as polylactic acid come from corn starch.
Misconceptions: green chemistry means just recycling or that it is more expensive; it often saves money through lower waste and energy costs. It is about the design stage, preventing pollution rather than cleaning up afterwards.
Key ideas
- Atom economy
- Renewable feedstocks
- Safer solvents
Quick check
Use cases: where Green Chemistry helps
- Homework: review the key idea behind Green Chemistry before you start a problem set.
- Exam revision: use the quick check to test whether you can recall Green Chemistry without notes.
- Visual learning: play with the interactive lab to see how Green Chemistry changes when you adjust its inputs.
- Teaching a friend: explain Green Chemistry in your own words, then compare your version with the key ideas.
Chemistry explains medicine, food, cleaning products, fuels and building materials.
Frequently asked questions
What is Green Chemistry?
Green chemistry reduces hazard and waste.
What will I learn in Green Chemistry?
Atom economy. Renewable feedstocks. Safer solvents.
Is Green Chemistry part of Chemistry?
Yes. It is one of 150 Chemistry topics on LearnViz HighSchoolEdu, with 3 key ideas, a live animation and a quick check.
Does the Green Chemistry lab work on a phone or tablet?
Yes. The animation resizes to fit your screen and supports touch, so you can drag, tap and slide with your finger.
How should I study Green Chemistry?
Read the summary and key ideas first, play with the interactive lab to see the idea in motion, then answer the quick check. If you get a question wrong, go back to the key idea it tests.
Do I need an account, and is my progress saved?
No account is needed. Marking a topic as learned is saved in your own browser, so it stays on that device and is not sent to a server.