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level: Level 1 of Rates and Equalibria

Questions and Answers List

level questions: Level 1 of Rates and Equalibria

QuestionAnswer
The equilibrium lawkc = products 2 / reactants2
How to calculate rate?change in conc/time
The definition for activation energyThe minimum energy req to for reactant to react
The effect of conc on reaction rateincreased conc gives more molecules in the same volume , more chance of collisions so more successful collisions per unit time
The effect of pressure on rate of reactionThe same no of molecules occupy a smaller volume so more successful collisions per unit time
Define CatalystA catalyst lowers the activation energy of the reaction by providing an alternate route
Homogenous catalystSame physical state of all reactants
Heterogenous catalystDifferent physical state from the reactants
Uses of catalysts- reducing energy consumption -cost efficient -biological catalysts -industry
Key things to remember in the boltzman curve- axis names energy and number of molecules - the higher temp shift to right a greateer proportion of molecules exceed activation energy so more collision so a faster r of r - write the crocoadile
Dynamic equilibrium1. the concentration of the reactants and products remain the same 2. the rate of the forward reaction is the same as reverse 3. closed system
L e Chatelier's principlethe position of the equilibrium will shift to minamise the change
The effect of conc on equilibriumincreasing conc of reactant will shift right decreasing conc of products will shift left
Increasing H+/ adding an acidYou would add an alkali * mention colour changes *
The effect of pressure on equilibriumincrease shifts to fewer decrease shifts to greater
The effect of temperature on equilibrium- look at the sign as that is the forward reaction -increase temps shifts in endo -decrease temp shifts in exo as -
The equilibrium lawkc = products 2 / reactants2