Kinetics

• What is they first order

  The rate doubles if the concentration doubles

  k =[A]
• what is the second order

  the rate quadruples if [A] doubles

  k = [A]2
• what is the zero order

  the rate stays the same if [A] doubles

  rate = k
• what is the rate equation

  rate = k [A] [B]
• what is the rate constant

  The calculated rate of reaction at a specific temperature
• what is the overall order

  all of the inicies added together
• what is the unit of rate

  moldm-3s-1
• what happens if you increase the temperature wrt k

  if [A] and [B] stays the same when temperature is increased then the rate increases therefore the value of k also increases
• what is half life

  the time taken for a concentration of a reaction to half - half lives are constant
• Draw a zero order conc vs time graph

  Image shown below

  
• Draw a first order conc vs time graph

  Image shown below

  
• Draw a second order conc vs time graph

  Image shown below

  
• Draw a zero order rate vs conc graph

  Image shown below

  
• Draw a first order rate vs conc graph

  Image shown below

  
• Draw a second order rate vs conc graph

  Image shown below

  
• Write the rate determining step of NO2 + CO —> NO + CO2

  when rate = k [NO2]2


  RDS : NO2 + NO2 —> NO + NO3

  NO3 + CO —> NO2 + CO2
• write the rate determining step for 2NO + NO —> N2O2 when rate = k[NO]2

  RDS : NO + NO —> N2O2

  N2O2 + O2 —> 2NO2
• What is the atthenius equation and it in its more useful form

  K = Ae-ea/rt

  ln k = - ( ea/rt) + ln A
• how can you use Arrhenius to work out a gradient 


  gradient = (-ea/r) which is the same as change in y over x
• when can you exstappalate

  when the start is 0 , elna = a when 0
• What are the units of concentration

  Moldm-3
• why would we want a large excess

  as we need one concentration to act as a constant so that when the reaction progresses the concentration hardly changes