oils, earth and atmosphere revision notes.

• PRODUCTS FROM OILS.

Cracking hydrocarbons.

• we can split large hydrocarbon molecules up into smaller molecules by heating them and passing the gas over a catalyst.
• cracking produces unsaturated hydrocarbons, which we can alkenes.
• alkenes burn, and also react with bromine water, producing colourless products.

Making polymers from alkenes.

• plastics are made of polymers.
• polymers are large molecules (small molecules) join together.

The properties of plastics.

• monomers affect the properties of the polymers that they produce.
• changing reaction conditions can also change the type of polymers that is produced.

New and useful polymers.

• new polymers are being developed all the time. they are designed to have properties that make them specially suited for certain uses.
• smart polymers may have their properties changed by other changes in their surroundings.

PLANT OILS.

Extracting vegetable oils.

• vegetable oils can be extracted from plants by pressing or by important foods.
• vegetable oils are important foods.
• unsaturated oils contain carbon-carbon double bonds. we can detect them using bromine or iodine solutions.

Cooking with vegetable oils.

• vegetable oils are useful in cooking because…