Chemistry Key Terms 0.0 / 5 ? ChemistryKey TermsGCSEAQA Created by: Nicole Anna MorrisonCreated on: 30-03-18 12:21 Compound Contain two or more elements chemically combined 1 of 41 Mixture Two or more elements or compounds not chemically combined together 2 of 41 Atomic Number Number of protons in an atom 3 of 41 Mass number The sum of the protons and neutrons in an atom 4 of 41 Isotope Atoms of the same element but have a different number of neutrons 5 of 41 Noble Gas Any Group 0 element 6 of 41 Alkali Metal Any group 1 element 7 of 41 Halogen Any group 7 element 8 of 41 Ion When an atom has either lost or gained electrons 9 of 41 Melting point The temperature that melting and freezing occur 10 of 41 Delocalised electrons Electrons not permanently associated with an atom 11 of 41 Polymer Very large covalent bonded molecule 12 of 41 Intermolecular Between molecules 13 of 41 Aqueous Dissolved in water 14 of 41 Alloy A metal mixed with another element 15 of 41 Graphene A single layer of graphite 16 of 41 Coarse Particle Diameter between 1 x 10 - 2.5 x 10 m. These are dust particles 17 of 41 Relative Formula Mass (Mr) The sum of the relative atomic masses of the atoms in the numbers shown in the formula 18 of 41 Mole A unit for measuring the amount of a substance 19 of 41 Avogadro Constant The number of atoms, molecules or ions in a mole of a given substance. 20 of 41 The value of Avogadro Constant 6.02 x 10 per mole 21 of 41 Yield The amount of product obtained in a chemical reaction 22 of 41 Atom Economy A measure of the amount of starting materials that end up as useful products 23 of 41 Oxidation The gain of oxygen or loss of electrons in a reaction 24 of 41 Reduction The loss of oxygen or gain of electrons in a reaction 25 of 41 Neutralisation Reaction in which acidity or alkalinity is removed forming neutral products 26 of 41 Electrolysis Splitting a substance using electricity 27 of 41 Electrolyte A liquid that contains ions the can be electrolysed 28 of 41 Cathode A negatively charged electrode 29 of 41 Anode Positively charged electrode 30 of 41 Soluble Able to be dissolved 31 of 41 Exothermic Reaction A reaction which transfers energy to the surroundings 32 of 41 Endothermic Reaction A reaction which takes in the energy from the surroundings 33 of 41 Activation Energy The minimum amount of energy that particles must have to react 34 of 41 Reaction profiles (energy level) diagram A diagram which shows the relative energies of reactants and products 35 of 41 Rechargeable Battery When the chemical reaction can be revered by supplying an external current 36 of 41 Fuel cell When the fuel is oxidised electrochemically to produce a potential difference 37 of 41 Collision theory Chemical reactions can occur only when reacting particles collide with each other and with sufficient energy 38 of 41 Reversible Reaction When the products of the reaction can react to form the original reactants 39 of 41 Equilibrium When the forward and reverse reactions happen at the same rate 40 of 41 Le Chateliers principle If a system is equalibrium and a change is made to any of the conditions, then the system responds to the counteract change 41 of 41
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