Rates

Question	Answer
Rates can be monitored by volume of gas, eg. using a gas syringe/displacement of water from a measuring cylinder or by mass.	For reactions to occur particles must collide and they must collide with the minimum, activation energy or above. Anything which inc 'freq of collision' or 'proportion of particles with min Ea or above' will inc rate
At the start conc, mass, SA of reactants id greatest. When it begins to slow down it is cos conc of HCl/SA of CaCO3 has reduced as products form , so freq of collisions slows down causing rate to dec. Reaction stops cos one of the reactants has ran out	rate fastest-graph is steep rate slows-gradient less steep reaction stops- gradient=0/levels off gradient=rate= Change in Y/Change in X
Greater the SA the faster the reaction Greater the temperature the faster the reaction When a catalyst is added the speed inc	CaCO3 + 2HC l~ CaCl2 + H20 + CO2

Resource summary

	Created by Konrad O'Neill over 10 years ago