Organic chemistry quiz 4.0 / 5 based on 1 rating ? ChemistryCrude oil, cracking and hydrocarbonsGCSEAQA Created by: thehardworkerCreated on: 18-11-17 11:04 Looking at the chemical formulae of these compounds, which is an alkane? C3H8 1 of 26 What is the name of the alkane which has the formula C4H10? Butane 2 of 26 Alkanes are saturated hydrocarbons. What does this mean? All C atoms are bonded by single covalent bonds 3 of 26 When hydrocarbons like the alkanes burn in plenty of air, what type of reaction takes place? Complete combustion 4 of 26 Which is a correct statement about incomplete combustion? Poisonous carbon monoxide may be produced 5 of 26 What is needed in order for chlorine to react with ethane in a substitution reaction? Ultraviolet light 6 of 26 Why are alkenes more reactive than alkanes? The double bond can break open easily 7 of 26 How do you test for an alkene? They turn bromine water colourless 8 of 26 Large alkane molecules can be cracked to produce more useful molecules.Give two conditions used to crack large alkane molecules. Hight temperature and a catalyst 9 of 26 What is the name of the reaction to produce ethanol from sugar? Fermentation 10 of 26 What is the name of the reaction to produce ethanol from ethene? hydration 11 of 26 A lot of the ethanol produced is used as a fuel for cars. What are two reasons why most of this ethanol is made from plants and not from crude oil? Resources of crude oil are non-renewable and producing ethanol from plants uses less energy. 12 of 26 A student made ethanol from sugar. What change is seen in the limewater? Turns cloudy, because Carbon dioxide is produced 13 of 26 What is crude oil? Mixture 14 of 26 What is the temperature gradient in a fractioning column? Hot at the bottom and cooler as you go up 15 of 26 The longer the hydrocarbons the... Higher the boiling points 16 of 26 What is Bitumen used for? Roofing and road construction 17 of 26 How was crude oil formed? From the remains of dead plants and animals over millions of years ago 18 of 26 What is cracking? Splitting up long-chain hydrocarbons into short-chain hydrocarbons 19 of 26 How can you test for the purity of a sample? Measure its boiling or melting point 20 of 26 What is steam cracking? Heating hydrocarbons with a high temperature 21 of 26 What is thermal decomposition? Breaking molecules down by heating them 22 of 26 What is the general equation for complete combustion? Hydrocarbon+oxygen>carbon dioxide+water(+ energy) 23 of 26 What is a homologus series? A group of organic compounds which react in a similar way 24 of 26 Are fossil fuels non-renewable or renewable fuels? Non-renewable 25 of 26 What is oxidation? The gain of Oxygen 26 of 26
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