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A snapshot of the summary - Chemical ideas
1 Agriculture and Industry
How do you calculate the atom economy?
(Mr of useful product/ Mr of reactants) x 100
1.1 Green chemical process
What are potential benefits of using a certain industrial method?
- high percentage yield
- solvent can be recycled = does not damage the environment through waste disposal
- no toxic products
- high atom economy
How can chemists help farmers improve food?
- control soil pH
Suggest two reasons why CO isn't released into the atmosphere?
- it's toxic
- it can be burnt as a fuel
What are the environmental hazards of making benzophenone?
- HCl is produced = toxic
- aluminium compounds are wasted
- benzene is toxic and hazardess
What are the benefits of recycling?
- minimise waste
- reduce energy consumption
- reduce feedstock consumption
What difficulties arise when recycling plastics?
Sorting different types of plastics as they have similar properties. As a result, most recycled plastics are mixtures of different polymers.
Why does recycling aluminium mean a large saving of emitted carbon dioxide compared to other materials e.g. glass?
The process of extracting aluminium consumes a large amount of energy which is produced from burning fossil fuels. Less fuel is needed to recycle aluminium.
What hazard arises when using sodamide? How is it minimised?
Reacts violently with water
Keep under anhydrous conditions
What hazard arises when using pyridine? How is it minimised?
Keep in a sealed container & incinerate excess gas