Question 18M.3.sl.TZ2.8
| Date | May 2018 | Marks available | [Maximum mark: 2] | Reference code | 18M.3.sl.TZ2.8 |
| Level | sl | Paper | 3 | Time zone | TZ2 |
| Command term | Outline | Question number | 8 | Adapted from | N/A |
Green Chemistry reduces the production of hazardous materials and chemical waste.
Outline two specific examples or technological processes of how Green Chemistry has accomplished this environmental impact.
[2]
Any two of:
replaces plastics with biodegradable/starch/cellulose based plastics
use enzymes instead of polluting detergents/phosphates
OR
use of enzymes means lower temperatures can be used
OR
use enzymes instead of emulsifiers to treat oil spills
OR
use enzymes to produce esters at lower temperatures/without sulfuric acid
replace organic/toxic solvents with carbon dioxide
replace polymers from fossil fuel with bamboo/renewable resources
develop paint resins reducing production of volatile compounds «when paint is applied»
industrial synthesis of ethanoic/acetic acid from methanol and carbon monoxide has 100% atom economy
energy recovery
Accept formulas for names.
Award mark for any other reasonable specific green chemistry example that prevents the release of pollutants/toxic chemicals into the environment by changing the method or the materials used.
Do not award mark for methods that involve clean-up of pollutants from the environment such as host-guest chemistry or alternative energy sources.
[2 marks]