3.1.9-Rate Equations Flashcards
What is the rate equation showing
It shows the relationship between concentration of reactants to the rate of chemical reaction
Define order of reaction
With respect to a reactant is the power to which the concentration of a reactant is raised
Define overall order of reaction
The sum of the powers of the concentration terms in the rate equation
Define rate constant
The constant of proportionality in a rate equation, value of which is dependent on temperature and activation energy in a reaction
What is the only thing K is affected by
Temperature
What does the Arrhenius equation show
The relationship between temperature and the rate constant
Show 3 forms of the Arrhenius equation
K= Ae^ -Ea/RT
LnK= LnA - Ea/RT
Ea = RT(LnA-LnK)
Draw graph to represent Arrhenius equation and label
Draw
Describe what the Arrhenius graph is showing
Natural log of Arrhenius equation gives a straight line means activation energy and Arrhenius constant can be found from graph
How is the rate equation determined
Experimentally determines relationship
What can rate equations tell us
Tell us about mechanism and if there is a catalyst
Draw the zero order concentration time graph
Draw
Draw the first order concentration time graph
Draw
Draw the second order concentration time graph
Draw
How can you find the rate constant from the concentration time graph
On the zero order graph only the gradient gives the the rate constant
Draw zero order rate concentration graphs
Draw
What does a horizontal line mean on a rate concentration graph
Zero order
Draw rate concentration graph of first order
Draw
What does a rising straight line mean on a rate concentration graph
First order
Draw second order concentration time graph
Draw
What does a upward curve mean on a rate concentration graph
Second order
What methods are used to make a rate concentration graphs
Intial rates method
Continuous rates method
Explain initials rates method
Doing several experiments where the the initial rate is measured and initial concentrations reagent is changed
Explain continuous rates method
Doing one experiment where rate and concentration of a reagent is measured at several times during reaction
What is the rate determining step
Overall a reaction is dependent on its slowest step which is called the rate determining step
