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TRIPLE2 organic 1

TRIPLE AQA Chapter 10 alkanes and alkenes

QuestionAnswer
what is a HydroCarbon? A COMPOUND of Hydrogen and Carbon ONLY, JOINED TOGETHER
What is the formula for Methane? CH4
Which Hydrocarbons are the most flammable? The ones with short chains of Carbon
What is Kerosene used for? Fuel for airplanes
How do we separate the different fractions of crude oil? Fractional Distillation
What is bitumen used for? To put on roads
Which fraction is the most viscous? Fuel Oil
The gases fraction contains chains of carbons. How long are the chains? 1 to 4 Carbon atoms
Ch4 is the formula for a member of which family? Alkane
C2H4 is the name of which compound? Ethane
What is the formula for Propane? C3H8
What is the formula for Propene? C3H6
Which type of Hydrocarbons will make Bromine Water change colour? Alkenes
What is the reaction where a long chain alkane breaks down into a shorter chain alkane and an Alkene? Cracking
What is a polymer? A long long long HydroCarbon chain made from many monomers stuck together
What is a monomer? A single unit that contains a double bond
What happens during polymerisation? The double bond open up and joins another monomer
What is the monomer that will make Poly(Propene)? Propene
What is the polymer made from ChloroEthene? PVC! Another name for ChloroEthene is Vinyl Chloride (but you could have said PolyChlorEthEne)
What is the monomer that will make PolyTetraFluoroEthene? TetraFluoroEthene
What is Poly(Ethene) used for? As cling film
What is PVC used for? For window frames
What is PTFE used for? For non-stick saucepans
What does biodegradable mean? Can rot
Why should we recycle? To save natural resources, so that we can use crude oil for other purposes; burning produces toxic gases; there is less and less landfill sites; saves energy
Why are plastics not recycled more? Some plastics are mixtures of plastics and they are difficult to separate; People may not see the point of recyling, they may not understand that resources are running out
Which compounds are saturated? Alkanes
Which compounds are unsaturated? Alkenes
How do you draw an AlkAne? Draw the correct number of carbons in a chain; join them with single links; draw links so that each Carbon has FOUR links (no more, no less)
How do you draw an AlkEne? Draw the correct number of carbons in a chain; join TWO carbons with a DOUBLE link; join the other carbons with single links; draw links so that each Carbon has FOUR links (no more, no less)
What is the mnemotechnic to remember that AlkEnes are Unsaturated? DEUX: Double Ene Unsaturated X (no more colour)
What is the chemical test to distinguish between AlkAne and AlkEne? Bromine water stays ORANGE with an alkane; but goes from Orange to COLOURLESS with an AlkEne
Explain how fractional distillation works crude oil is heated to 350°C; crude oil boil;the VAPOURS cool as it rises up the tower; VAPOURS condense at different levels according to the size of the molecules: the smaller molecules have LOWER boiling point and condense at TOP of tower
Describe the cracking experiment VAPOURS of an AlkAne are passed over a HOT CATALYST
Write the equation for Decane (C10H22) being cracked into Ethene (C2H4) and a smaller Alkane C10H22 --> C2H4 + C8H18; the number of carbon must be the same on both sides of the arrow
Decane (C10H22) can be cracked into 2 EthEne molecules and an AlkAne. What is the formula of the AlkAne? Write the equation C10H22 --> C2H4 + C2H4 + C6H14; the number of carbon must be the same on both sides of the arrow; The alkane is C6H14
Explain why we need to crack long chain alkAnes To get smaller molecules that are more USEFUL (more flammable) and more in DEMAND
Write the equation for the polymerisation of Ethene n CH2=CH2 --> -(-CH2-CH2-)-n; did you remember the little n after the bracket; did you remember the n on the reactant side (to balance)
Write the equation for the reaction between Bromine and Ethene Br2 + CH2=CH2 --> CH2(Br)-CH2(Br) [please note that the Br in bracket is to show that the Br is BELOW the CH2]
Why does the colour from orange to colourless (decolourises) during the Unsaturation test? Bromine (Br2) is orange; but as each Br atom attaches to the double bond, there is no more Bromine (Br2), so the colour disappears
Write the equation for the reaction between Bromine and PropEne Br2 + CH3-CH=CH2 --> CH3-CH(Br)-CH2(Br) [please note that the Br in bracket is to show that the Br is BELOW the CH2]
Write the equation for the reaction between Steam and PropEne H2O + CH3-CH=CH2 --> CH3-CH2-CH2-OH OR CH3-CH(OH)-CH2 [please note that the OH in bracket is to show that the OH is BELOW the CH2]
Why is there two products formed when PropEne reacts with water? The OH from the water can join to EITHER carbon frm the double bond
What is the name of the product of addition of EthEne with Water? Ethanol
What is the name of the product of addition of PropEne with Water? PropAnol
What is the name of the product of addition of EthEne with Bromine? DibromoEthAne (the product is a saturated compound so it is an alkAne like chemical)
What is the name of the product of addition of PropEne with Bromine? DibromoPropAne (the product is a saturated compound so it is an alkAne like chemical)
What are the conditions used for the addition of Hydrogen onto an AlkEne? 60C and a Nickel catalyst
What are the conditions used for the addition of Water onto an AlkEne? high temperature, high pressure and a Phosphoric acid catalyst
Created by: ursulinechem2