16 Flashcards
give the two concentration rate equations
rate = change in conc of product/time
rate = change in conc of reactant/time
how can you measure rate of reaction
measuring the volume of gas evolved
measuring change in mass
colorimetry
change in conc using titration
measuring change in pH
measuring change in electrical conductivity
how do you measure the volume of gas evolved
collect using gas syringe
collect through water with measuring cylinder
what is quenching a reaction
the process of stopping or slowing down the reaction in an aliquot
what is the relationship between concentration of reactant & rate of reaction
directly proportionate
what are the rate equations for 0 order, 1st order & 2nd order
rate = k
rate = k[A]
rate = k[A]*2
what effects rate constants
temperature
give a third order rate equation
rate = k[A]*2[B]
what is a rate equation
an equation expressing the mathematical relationship between the rate of reaction and the concentration of the reactants
what is the RDS (rate determining step)
the slowest step in the mechanism for the reaction
how do you calculate the order of a reaction from a conc time graph
find the half life of the reactant if its the same its first order if it doubles each time its second order if its a straight line with a negative gradient its 0 order
how do you calculate rate of reaction on a conc or volume time graph
drawing a tangent to line & calculating its gradient
what is a reaction that is elementary
a reaction taking place that is a single collision between two reactant particles
define activation energy
the minimum energy that particles must have for a reaction to occur
define catalyst
a substance that increases the rate of reaction but is chemically unchanged at the end of the reaction
