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Rate Equations

AQA A Level Chemistry

QuestionAnswer
How can the rate of reaction be measured? Give 3 different examples Measure volume of gas produced, Monitor the change in mass, time taken for colour to change
What is the unit of rate of reaction? mol dm-3 s-1
Write a rate equation for a reaction that is first order with respect to reactant A and 2nd order with reactant B. r = k [A] [B]2
Write a rate equation for a reaction that is first order for X and first order for Y r = k [X] [Y]
For a reaction that is second order with respect to reactant Y what would happen to the rate if the concetration is tripled? Rate would increase by 9 x
For a reaction that is second order with respect to reactant A, what will happen to the rate of reaction if the concentration of A is doubled? It will be quadrupled.
Explain what the order of a particular reactant is in terms of the particles of that reactant in the mechanism of the reaction The order of a particular reactant is the number of particles of that reactant that participate before or during the rate determining step.
What is the order of a particular reactant in the rate equation of a particular reactant "The power to which a concentration is raised in the rate equation
" What is the overall order of a chemical reaction. "The sum of all the individual orders in the rate equation.
" If a reaction is zero order with respect to a reactant Z what is the effect on the rate of a reaction of increasing the the concentration of Z No effect.
What is the unit of the rate constant k in this rate equation? rate = k [A] s-1
What is the unit of the rate constant k in this rate equation? rate = k [P] [C] mol-1 dm3 s-1
What is the unit of the rate constant k in this rate equation?rate = k [D]2 [B] "mol-2 dm6 s-1
" How does a catalyst increase the rate of a reactant? "Catalysts provide an alternative reaction pathway with a lower Activation Energy. Decreasing the Activation Energy means that more particles will have sufficient energy to overcome the energy barrier and react
" How is the initial rate calculated from a graph of conc v time Draw a tangent at t=0 and calculate the gradient
How is the rate at 30 sec calculated from a graph of conc v time Draw a tangent at t=30 and calculate the gradient
In a continous rate method you must have one reactant largely in excess. Explain why? The reactant that has a large excess will have a very small change in concentration so is effectively kept constant
How could you confirm the order of a reactant graphically plot a graph of rate v conc and if it’s a straight line it is order 1 wrt reactant. If not plot rate v conc2 for order 2 etc..
What order is a horizontal line when a graph of rate v conc is plotted zero order
What order is a straight line graph of rate v conc Order 1
What order is a straight line graph of rate v conc2 Order 2
How do you convert Temp in degrees to Kelvin add 273
The Arrhenius equation is lnK = lnA- Ea/RT. Describe how a graph that could be plotted from a number of values of K(rate constant) and T (Temperature in K) to determine the value of activation energy Ea lnK should be plotted on the y axis, 1/T on the x axis then the gradient is -Ea/R
Calculate the Ea if A= 2.7x10^11 and k = 0,.00450mol-1dm3s-1 and T=683K using lnK = lnA- Ea/RT. Give your answer to 3 sig figs 180kjmol-1
If a reaction is zero order with respect to a reactant Z where must Z be in the mechanism of the reaction? After the Rate Determining Step
What is meant by rate determining step The slowest step in the mechanism of a reaction
Why are catalysts in the rate equation but are not in the chemical equation? Catalyst are in the mechanism for the reaction but are regenerated so are not found in the chemical equation
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