Revision for Chemistry 1b 4.0 / 5 based on 4 ratings ? ChemistryC1GCSEAQA Created by: kennedylilyCreated on: 04-04-16 11:30 What is 'cracking'? Cracking is the splitting up of long chain hydrocarbons 1 of 25 Give an example of a substance that it cracked, and the products that you get from cracking it Kerosene -> Octane + Ethene 2 of 25 What kind of carbon-carbon bond do alkenes have? Double bond 3 of 25 What is the general formula for alkenes? CnH2n 4 of 25 What are polymers? They are very large, long-chain molecules 5 of 25 What are polymers created from? Monomers 6 of 25 Give two factors which can affect the physical properties of polymers Temperature and pressure 7 of 25 List four products that are made from polymers Lycra fibre, biodegradable packaging, plastic bags and memory foam 8 of 25 Why might polymers become more expensive in the future? As crude oil resources get used up, the price of crude oil will rise; therefore, crude oil products like polymers will become more expensive 9 of 25 Why are oils distilled after they have been extracted? Distillation refines oil, and removes water, solvents and impurities 10 of 25 List two advantages of using vegetable oils in food 1. They have a higher boiling point than water (so food is cooked quicker) 2. They enhance the flavour of the food 11 of 25 Apart from in food, give one use of vegetable oils To produce fuels 12 of 25 What kind of carbon-carbon bond do saturated oils contain? Single bond 13 of 25 What is the process called when you react unsaturated oils with hydrogen? Hydrogenation 14 of 25 Why do processed products usually contain partially hydrogenated vegetable oils instead of butter? These oils are a lot cheaper than oil and they also have a longer shelf-life 15 of 25 Give an example of an emulsion Mayonnaise 16 of 25 What is the 'head' of the emulsifier called (likes water, hates oil)? Hydrophillic 17 of 25 What is the 'tail' of the emulsifier called (likes oil, hates water)? Hydrophobic 18 of 25 Suggest one problem of adding emulsifiers to food Some people are allergic to certain emulsifiers (e.g. egg yolk) 19 of 25 What two pieces of evidence did Wegener use to support his theory of continental drift? Similar fossils found on different continents and matching layers in the rock in different continents 20 of 25 What can be found beneath the Earth's crust? Mantle 21 of 25 Name the two main gases that make up the Earth's atmosphere today Nitrogen and oxygen 22 of 25 Name the three main stages that explain why today's atmosphere is different form the Earth's early atmosphere 1. Volcanoes gave out gases 2. Green plants evolved and produced oxygen 3. Ozone layer allows evolution of complex animals 23 of 25 What is the primordial soup theory? It states that billions of years ago, the Earth's atmosphere was rich in nitrogen, hydrogen, ammonia and methane 24 of 25 Why do we fractionally distil air? We do this to get a variety of products for use in industry 25 of 25
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