Science (Unit 1)(Chemical Reaction) 0.0 / 5 ? ScienceChemical reactionsGCSEAll boards Created by: Katrina_loydCreated on: 17-05-18 16:27 Melting a solid to a liquid 1 of 52 Freezing a liquid changing to a solid 2 of 52 evaporation a liquid changing to a gas 3 of 52 Condensation a gas changing to a liquid 4 of 52 Sublimation a solid changing to a gas 5 of 52 Physical Change a reversible reaction 6 of 52 Chemical Change an irriversible reaction 7 of 52 Reactants The substances that are reacted together in a chemical reaction and are written before the arrow in a word equation 8 of 52 Products The substances that are produced in a chemical reaction and are written after the arrow in a word equation 9 of 52 Flammable burns easily 10 of 52 3 physical changes melting chocolate, melting wax, melting butter 11 of 52 steam the gas version of water 12 of 52 boiling point 100 degrees C 13 of 52 melting point or freezing point 0 degrees C 14 of 52 To change from one point to another you must... heat or cool 15 of 52 Where in the water cycle does the water condense? The sky 16 of 52 Where in the water cycle does water freeze? The sky or mountains 17 of 52 Where in the water cycle does the water melt? on the ground 18 of 52 if it rained today where would most of the rain go? It would evapourate 19 of 52 How are insoluble particles removed? Filtration 20 of 52 how are germs removed? chlorination 21 of 52 what does '------>' mean? changes into 22 of 52 What does zinc oxide look like before heating? White solid 23 of 52 What does zinc oxide look like after heating? Yellow solid 24 of 52 is zinc oxide reversible or irriversible after heating? Reversible 25 of 52 What does copper sufate look like before heating? Blue salt 26 of 52 What does copper sulfate look like after heating? white solid 27 of 52 is copper sulfate reverisble or irriversible after heating? Irreversible 28 of 52 What does magnesium ribbon look like before heating? Grey metal solid 29 of 52 What does magnesium ribbon look like after heating? White ash 30 of 52 Is magnesium ribbon reversible or irrversible after heating? Irreversible 31 of 52 What does copper carbonate look like before heating? green solid 32 of 52 What does copper carbonate look like after heating? Black solid 33 of 52 is copper carbonate reversible or irreversible after heating? Irreversible 34 of 52 What do Iodine crystals look like before heating? black solid 35 of 52 what do iodine crystals look like after heating? purple gas 36 of 52 are iodine crystals reversible or irreversible? reversible 37 of 52 what does Ammonium dichromate look like before heating? orange solid 38 of 52 what does Ammonium dichromate look like after heating? green solid 39 of 52 Is ammonium dichromate reversible or irreversible after heating? Irreversible 40 of 52 4 characteristics for a physical change No new substance, reversible, no change in mass, small amount of energy or heat is required 41 of 52 4 characteristics for a chemical change a new substance, irreversible, chnage in mass, large amount of energy taken in or given out 42 of 52 What is the word eqaution for burning magnesium in air magnesium + oxygen ---> magnesium oxide 43 of 52 3 fossil fuels coal, gas and oil 44 of 52 what is the word equation for burning? fuel + oxygen ---> carbon dioxide + water + energy 45 of 52 what is in the fire triangle? Fuel, oxygen, heat 46 of 52 what would happen if 1 thing from the fire triangle is remvoed from the fire? The fire would go out 47 of 52 What percentage of the air is Nitrogen? 78% 48 of 52 What percentage of the air is Oxygen? 21% 49 of 52 What percentage of the air is Carbon Dioxide? 0.03% 50 of 52 What percentage of the air is Water Vapour? varies 51 of 52 What percentage of the air is Helium, Neon and other noble gases 0.90 52 of 52
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