Chemistry 0.0 / 5 ? ChemistryHydrocarbonsGCSEAQA Created by: percivalcCreated on: 14-05-15 16:10 What is a hydrocarbon? A substence that is made up from hydrogen and carbon atoms only 1 of 31 What does boiling point depend on? Size 2 of 31 What are the smallest hydrocarbons? Gasses 3 of 31 What are hydrocarbons with 5-16 carbon atoms? Liquids 4 of 31 What are larger hydrocarbons? Solids 5 of 31 What is the first step in fractional distillation? Crude oil is heated to evaporate it 6 of 31 Whats is the second step in fractional distillation? Crude oil passes into a tower; the hottest at the bottom and the coolest at the top 7 of 31 Why is the hottest part of the oil at the bottom and the coolest at the top? Because the different hydrocarbons have different boiling points so they condense at different positions in the coloumn 8 of 31 What are the 'traps' used for? The traps collect the liqued and each fraction has a different use 9 of 31 How many traps are there? 7 10 of 31 What is trap 1 for? Bitumen 11 of 31 What is trap 2 for? Fuel oil 12 of 31 What is trap 3 for? Lubricating oil 13 of 31 What is trap 4 for? Diesel 14 of 31 What is trap 5 for? Kerosene 15 of 31 What is trap 6 for? Gasoline 16 of 31 What is trap 7 for? Gases 17 of 31 What is the lowest temperature involved in fractional distillation? 70 degrees celcius 18 of 31 What us the highest temperature involved in fractional distillation? 360 degrees celcius 19 of 31 What is the equation for complete comubustion? CH4 + (2)02 -> CO2 + (2)H2O 20 of 31 What is the equation for incomplete combustion? CH4 + (1 1/2)02 -> CO + (2)H20 21 of 31 What are three alkanes? Methane, ethane, propane 22 of 31 What are two alkenes? Ethene, propene 23 of 31 What are Alkanes? General formula = CnH2n+2, they are saturated, when mixed with bromine water there is no change 24 of 31 What are Alkenes? General formula = CnH2n, they are unsaturated, when mixed with bromine water they become decolourised 25 of 31 How are hydrocarbons cracked into smaller molecules? The hydrocarbons are heated and passed over a catalyst to break them down into smaller molecules 26 of 31 How is polyethene formed? Polyethene is formed when ethene molucules join together to make a poymer 27 of 31 How are ethen molecules allowed to join togethor? The double bonds between the two carbon atoms 'open up', allowing ethene molecules to join end to end 28 of 31 What is the charge on a Proton? Positive = +1 29 of 31 What is the charge on a neutron? Neutral = 0 30 of 31 What is the charge on an electron? Negative = -1 31 of 31
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