Topic 6/16 Flashcards
How to calculate instantaneous rate and average rate of reaction?
Average: y2-y1/x2-x1
Instantaneous: draw tangent and do the same above calulation for two points in that tangent
Rate expression
Just reactants
1/5 = k(w)^1(x)^b
How do you find order or reaction?
To find Sodium, where chlorine is constant look for changes in sodium
Units of k
0th = moldm^-3s^-1
1st = s^-1
2nd = mol^-1dm^3s^-1
3rd = mol^-2dm^6s^-1
What unit should activation energy equatio be in
activation energy should be in j
For maxwell-botlzman distribution, where should lower temperatuer be in respect to higher temperature
Peak of lower temperature to the left and higher, and higher temperature should finish above lower temperature
Relationship between rate constant and temperature
Exponential positive
What is the only variable that affects rate constant (k). What does higher of this variable mean
TEMP, higher rate constnat
What is correct for reaction with positive Gibbs free energy?
Formation of reactants is favoured
Labels for Maxwell Boltzmann Curve
X acis - kinetic energy
y acis - probability density/fraction of particles
Rate expression when the values are not constant
If X doubles and Y also doubles you can use that
X and y axis when plotting activation energy and y-int
X axis = 1/t
y axis = lnk
y-int = lnA
what is lnk2 = 4 equivalent to
logk2 =4
k2 = e4
k2 = 104
Effect of catalyst on chemical reaction
Provides alternative pathway with lower Ea, increases rate of reaction so greater proportion of molecules have kinetic energy greater or equal to activation energy
Relationship between temperature and kinetic energy
proportional
