Flashcards in Unit 2 Topic 5 Organic Deck (36):
What is a homologous series?
A family of organic compounds
What 4 things does each member of a homologous series have in common?
- Same general formula
- Each member differs by a CH2 group
- They have similar chemical properties
- Gradual change in physical properties as number of Carbon atoms increases
Give 4 homologous series?
Give 4 Alkanes?
Give molecular formula of the first 4 Alkanes?
What is combustion?
The reaction of a fuel with oxygen
Give the word equation for complete combustion?
Fuel + Oxygen ---> Carbon Dioxide + Water + Energy
Give the word equation for incomplete combustion?
Fuel + Little Oxygen ---> Carbon Monoxide + Water + Energy
Give 2 alkenes and their molecular formula?
How to distinguish between an alkene and Alkane?
Alkane in bromine water stays brown, but an alkene in bromine water turns the solution colourless
What is the functional group in an alkene?
The double bond between 2 carbon atoms
What states are ethene and propene at at room temperature?
Why are alkenes described as unsaturated molecules, while Alkanes described as saturated?
Alkenes are unsaturated because they can still bond with another substance, however Alkanes cannot
What are polymers?
Large organic molecules formed when smaller molecules form together in a long chain
What is addition polymerisation?
The process of adding monomers together to make a polymer
What is a monomer?
The small molecules that add together to form a polymer
Give 3 properties of polythene?
Resistant to acidic or alkaline conditions
Give 2 uses of polythene?
Give 3 properties of PVC?
Give 2 uses of PVC?
Give 2 benefits of plastics?
Extremely long lasting
Excellent insulation properties
Give 2 methods of plastics disposal?
Give an advantage of using landfill to dispose of plastics?
Landscape can be re landscaped after use
Give a disadvantage of using landfill to dispose of plastic?
Give an advantage of using an incinerator to dispose plastics?
Heat energy can generate electricity
Give a disadvantage of using incineration to dispose plastics?
Ash residue is toxic
Give 2 alcohols and their molecular formula?
Give word equation for fermentation?
Glucose ---> Carbon dioxide + Ethanol
C6H12O6 ---> 2CO2 + 2 C2H5OH
Give 2 uses of ethanol?
Give use of potassium dichromate?
What colour change occurs with potassium dichromate when ethanol is present? Why?
Orange to Green
This is because the Potassium Dichromate oxidises the ethanol and converts it in to ethanoic acid
Give 2 carboxylic acids and their molecular formula?
Methanoic acid HCOOH
Ethanoic Acid CH3COOH
What state are carboxylic acids at room temperature?
What state are alcohols at room temperature?
Give 2 uses of ethanoic acid?