Chemistry 3.0 / 5 based on 1 rating ? ChemistryGCSEEdexcel Created by: Georgia CresswellCreated on: 02-03-13 16:09 What is the test for potassium? It produces a lilac flame 1 of 17 What did Mendeleev order the periodic table in? Relative atomic mass and by properties 2 of 17 What is a lattice? Regular arrangement of atoms with strong electrostatic forces between charges 3 of 17 What is the properties of covalent substances? Simple: low melting and boiling points. Giant: high melting and boiling points 4 of 17 What happens in chromatography? Different components of a mixture are carried by a solvent at different speeds and so are separated 5 of 17 What does lithium, sodium and potassium do in water? Lithium floats/fizzes, sodium whiz in a molten ball and hydrogen ignites and potassium releases hydrogen which ignites in a lilac flame 6 of 17 Name a use of argon Fire extinguisher 7 of 17 What happens in an exothermic reaction? Bonds are made as the heat energy is released 8 of 17 What increases reaction rates? Temperature, concentration and surface area 9 of 17 What is an isotope? It is an atom if the same element with a different number if neutrons 10 of 17 Do ionic compounds conduct electricity? Only when molten or dissolved in aqueous solution 11 of 17 What does immiscible mean? Two or more liquids that can't mix 12 of 17 How are miscible liquids separated? Fractional distillation 13 of 17 What are the properties of ionic substances? High melting and boiling points, dissolve, conduct if molten or in solution 14 of 17 What are the alkali metals? Group 1, soft and easy to cut. Very reactive due to having one electron in the outer shell 15 of 17 What state/colour are the halogens at from temperature? Fluorine yellow gas, chlorine green gas, bromine brown liquid, iodine grey solid 16 of 17 Name a property of a catalyct converter adapted to its function. Large surface area to increase contact of carbon monoxide with oxygen 17 of 17
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