key points 2.0 / 5 based on 1 rating ? Chemistrykey topicsASWJEC Created by: charlouisherCreated on: 18-04-14 14:46 atomic number number of protons in an atom 1 of 36 ion particle where number of electrons doesn't equal number of protons 2 of 36 isotopes atoms having same number of protons but different number of neutrons 3 of 36 mass number number of protons + neutrons 4 of 36 2 protons and 2 neutrons positively charged alpha particles 5 of 36 fast moving electrons negatively chaged beta particles 6 of 36 atomic orbital an atom can hold up to 2 electrons with opposite spins 7 of 36 electronic configuration arrangement of electrons in an atom 8 of 36 electron shielding repulsion between electrons in different shells. inner repel outer 9 of 36 molar first ionisation of energy in an element energy required to remove one mole of electrons from one mole of its gaseous atoms 10 of 36 one mole amount of substance containing the same number of particles as there are atoms in exactly 12g of carbon-12 11 of 36 relative atomic mass average mass of one atom relative to one-twelfth the mass of carbon-12 12 of 36 relative isotopic mass mass of an atom of an isotope relative to one-twelfth the mass of carbon-12 13 of 36 relative molecular mass average mass of a molecule to one twelfth the mass of a atom of carbon-12 14 of 36 atom economy mass of required product/total mass of reactants x 100 15 of 36 percentage yield mass of product obtained/maximum mass x 100 16 of 36 dynamic equillibrium when the forward and reverse reactions occur at the same rate 17 of 36 Le Chatelier's Principle an equilibrium is equal to change, the equilibrium will shift to minimise the change 18 of 36 an acid a proton (H+) donor 19 of 36 a base a proton (H+) acceptor 20 of 36 enthalpy heat content of a sytems 21 of 36 enthalpy change heat added to a system at constant pressure 22 of 36 standard enthalpy change of formation enthalpy change when 1 mole is formed from its own elements in standard states 23 of 36 standard enthalpy change of combustion enthalpy change when 1 mole is combusted in oxygen under standard conditions 24 of 36 hess' law the total enthalpy change for a reaction independent of the route taken from the reactants to the products 25 of 36 average bond enthalpy average value of enthalpy required to break a covalent bond in (gaseous species) 26 of 36 bond enthalpy enthalpy required to break a covalent X-Y bond into X atoms and Y atoms (gaseous) 27 of 36 rate of reaction change in concentration of a reactant or product per time 28 of 36 activation energy minimum energy required to start a reaction by breaking bonds 29 of 36 an enzyme a biological caalystt 30 of 36 what is acidic pH 1-6-(red) 31 of 36 what is alkali pH 8-14-(purple) 32 of 36 what is neutral pH 7 (green) 33 of 36 mole equation n=m/Mr 34 of 36 concentration equation n=cxv 35 of 36 molar volume equation n=v/Vm 36 of 36
Key points for OCR AS chemistry Unit 2 (ideal for flash cards, podcasts or just general reviewing) (1) 0.0 / 5
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