chemistry
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- Created by: clobo210
- Created on: 07-12-15 10:12
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- chemistry
- hydrocarbons
- a compound made from ONLY a carbon and hydrogen element
- combustion
- is the rapid reaction between a substance and oxygen that releases heat and light energy
- exothermic reaction
- incomplete combustion
- products = soot
- the carbon and hydrogen are oxidised
- is the rapid reaction between a substance and oxygen that releases heat and light energy
- alkanes and alkenes
- alkanes are single bonded
- saturated compound
- a single bond is a pair of electrons
- alkenes contain at least one double bond
- unsaturated
- alkanes are single bonded
- polymers and plastics
- polymers are chemicals made up of extremely large molecules
- they are made by joining together many smaller molecules, called monomers
- polymerisation
- we can make polymers from monomers in a chemical reaction called polymerisation
- it needs high pressure and a catalyst
- ethane = monomers = polymers
- we can make polymers from monomers in a chemical reaction called polymerisation
- polymer properties
- polymers with no cross linking
- allows to pass over each other - flexible
- with cross links
- has strong intermolecular bond - high melting points
- polymers with no cross linking
- cooking
- why?
- flavour
- get rid of harmful bascteria
- no food poisioning
- easier to digest
- texture
- potatos
- a raw potato has starch grains trapped inside the cells
- when a potato is cooked
- the cell walls break
- this causes the potato cells lose their rigid structure
- why?
- hydrocarbons
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