Topic 11:equilibrium 0.0 / 5 ? ChemistryEquilibriaA2/A-levelEdexcel Created by: trudysandersCreated on: 08-03-18 15:39 What is a homogeneous reaction? A reaction where all the reactants and products are in the same phase. 1 of 11 What values do you use to calculate Kc? The concentrations of the products and reactants when equilibrium has been reached. 2 of 11 What can affect Kc? Only temperature can affect the value of Kc. 3 of 11 What is the Kc equation for this general reaction: wA + xB ⇢ yC + zD? Kc = ([C]^y [D]^z)/([A]^w [B]^x) 4 of 11 What is a heterogeneous reaction? A reaction in which at least one of the substances is in a different phase. 5 of 11 Are solids included in the calculation of Kc? No, because the concentration of a solid at a given temperature is determined by its density which is a constant. 6 of 11 What values are used to calculate Kp? The reactant and products partial pressures when equilibrium has been reached. 7 of 11 What is the Kp equation for the general reaction: wA + xB ⇢ yC + zD? Kp = (PC)^y(PD)^z/(PA)^w(PB)^x 8 of 11 how do you work out the mole fraction? mole fraction = number of moles of the compound/total number of moles 9 of 11 how do you work out partial pressure? partial pressure = mole fraction x the total pressure 10 of 11 what is the definition of partial pressure? The pressure that a gas would exert if it alone occupied the volume of the mixture. 11 of 11
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