Chemistry Revision February Test 0.0 / 5 ? ChemistryThe difference between non metals and metals and mixtures and compoundsAll LevelsNone Created by: ElisabethhhCreated on: 05-02-14 20:04 Non Metals Dull Low melting point Brittle Bad conductors of heat abd electricity 1 of 8 Metals Metals Usuall shiny High melting point usually Sonorous Dense usually Good conductors of heat and electricity Malleable Ductile 2 of 8 Mixtures The amount of ech substance may vary The mixture has the same properties as the stuff inside it It can be formed without any chemical reaction happening They can be easily seperated 3 of 8 compounds The amount of each element is fixed Has different properties to the elements its made up of A chemical reaction has to happen for the compound to be made It is difficult to seperate 4 of 8 Mass In a chemical reatcion no atoms are created or destroyed The mass of a rection is always the same as the mass prior The phlogiston theory is incorrect The phlogiston theory is that phlogiston is released when something burns 5 of 8 Neutralisation The mixture of acid and alkali reacting to each other 1 to 6 is acid 8 to 14 is alkali 7 is neutral Exothermic reaction Gives off heat because there is more energy Neutralisation gives off salt and water and carbon dioxide 6 of 8 Endothermic Reactions Endothermic Takes in heat surroundings get colder Energy needed to break old bonds are stronger than energy released making new bonds Exothermic Gives off heat Surroundings get hotter Energy released making new bonds is stronger than energy needed to break old bonds 7 of 8 Combustion Three things are needed for a fire to start Oxygen Heat Fuel The evaporated fuel ignites Hydrocarbons If there is hydrogen and carbon in the fuel it will produce water and carbon dioxide when it burns Fuel that has hydrogen and carbon are called hydrocarbonates 8 of 8
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