Chemical analysis 0.0 / 5 ? ChemistryAnalysing substancesGCSEAQA Created by: [email protected]Created on: 21-01-18 18:02 what is a pure substance? a substance that only contains one type of substance with no other substances mixed in 1 of 15 what is an impure substance? Impure materials are mixtures of elements, mixtures of compounds 2 of 15 How can you tell if a substance is pure? It will melt at a more specific temperature eg 85.0 instead of 85.4 3 of 15 How can you tell if a substance is impure by its melting point? the substance will melt over a large range of temperatures 4 of 15 what is boiling point? a measure of the strength of the inter molecular forces 5 of 15 What is a polar molecule? the electrons in covalent bonds are not shared evenly 6 of 15 What is the test for hydrogen gas? a lit splint produces a squeaky pop in the presence of hydrogen 7 of 15 what is the test for oxygen? a glowing splint relights in the presence of oxygen. 8 of 15 what is the test for carbon dioxide? if Limewater [Ca(OH)2] passes through Carbon dioxide [CO2] it goes cloudy 9 of 15 what is the test for chlorine gas? Blue litmus paper- turns red then bleaches in the presence of chlorine 10 of 15 what are the five separation techniques? Filtration, chromatography, simple distillation, fractional distillation and crystallization 11 of 15 what is a formulation a mixture pf ingredients prepared in a certain way and used for a certain purpose. Eg. if you are sick you may need a formulation of antibiotics 12 of 15 what is filtration and when is it used? to separate an insoluble solid from a liquid 13 of 15 what is the method for filtration using a beaker, filter funnel and filter paper you can separate the solid from the liquid 14 of 15 what is Chromatography this is used to separate soluble solids in liquids. it is often used to separate dyes in inks and food 15 of 15
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