chemistry 3.0 / 5 based on 1 rating ? ScienceChemistryGCSEAQA Created by: DymphnaCreated on: 18-04-13 18:44 what is cracking? the break down of large hydrocarbon molecules. 1 of 27 how do you crack a hydrocarbon? heating a mixture of hydrocarbon vapours and steam at a very high temperature or passing hydrocarbon vapours over a hot catalyst 2 of 27 what does unsaturated hydrocarbon mean? a hydrocarbon whose molecules contain at least one carbon-carbon double bond 3 of 27 what test can be used to detect an alkene? bromine water 4 of 27 what is a polymer? a substance made from very large molecules made up of many repeating units 5 of 27 name two common polymers polyethene and polypropene 6 of 27 name six uses of polymers packaging, clothing, dental fillings, fabric, pillows, duvets 7 of 27 what does biodegradeable mean? materials that can be broken down by microorganisms 8 of 27 name two sources of plant oils vegetable oil, sunflower oil, 9 of 27 name two important uses of plant oils cooking, making emulsions 10 of 27 why do we use vegetable oil for cooking? higher boiling point so cooks faster, changes flavour, more energy 11 of 27 name one disadvantage of cooking with vegetable oil give you heart disease 12 of 27 what are emulsions? a mixture of liquids that do not dissolve in each other 13 of 27 name three properties of emulsions opaque, thick, better texture 14 of 27 name three emulsions milk, cream, ice cream 15 of 27 what is hydrophillic? the water-loving part of an emulsifier molecule 16 of 27 what is a hydrophobic? the water-hating part of an emulsifier molecule 17 of 27 whats the difference between unsaturated and saturated? saturated contain the most fat 18 of 27 how do you harden an unsaturated oil into solid? by reacting it with hydrogen so that some of the carbon-carbon double bonds become single bonds 19 of 27 describe the structure of the earth inner core, outer core, mantle, crust, atmosphere 20 of 27 what are tectonic plates? the huge slabs of rock that make up the earths crust and top part of its mantle 21 of 27 what causes tectonic plates to move? convection currents 22 of 27 what two events occur when plates move suddenly? earthquakes, tidal waves 23 of 27 what are the proportions of different gases in the atmosphere? carbon dioxide, water vapour and nitrogen 24 of 27 what caused the release of gases that formed the early atmosphere? volcanoes released the gases. 25 of 27 how were the seas formed? as the earth cooled the water vapour condensed and formed seas 26 of 27 what produced the oxygen? plants 27 of 27
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