1.5 Kinetics Flashcards
What is collision theory?
A reaction won’t take place between two particles unless they collide in the right direction and collide with at least a certain amount of kinetic energy.
What is activation energy?
The minimum amount of energy required for a reaction to occur.
Name the graph that represents the different amounts of kinetic energy in molecules.
Maxwell-Boltzmann graph
What does a Maxwell-Boltzmann graph show?
The different kinetic energies of molecules in a gas.
Label the x-axis and y-axis of a Maxwell-Boltzmann graph.
X-axis: amount of kinetic energy
Y-axis: number of molecules
Where does the curve of a Maxwell-Boltzmann start? Why?
(0,0)
Because no molecules have 0 energy.
What does the peak of a Maxwell-Boltzmann represent?
The most probable energy (mode)
Where can you find the mean of the curve?
Just to the right of the peak of the curve.
Where is the activation energy found on the Maxwell-Boltzmann graph?
Towards the RHS when the curve starts to slowly lower.
What is the area under the curve of a Maxwell-Boltzmann graph?
The total number of molecules.
What happens when you increase temperature of a gas?
Molecules will have more kinetic energy so it’s probable that more successful collisions occur. Hence a greater proportion of molecules will have at least the activation energy to react.
How does an increase in temperature affect a Maxwell-Boltzmann graph?
The curve will be pushed more to the right and its peak lowers as the number of molecules remain the same. Hence the area under curve doesn’t change.
What happens when you increase concentration of a gas?
The molecules will be closer together and more successful collisions are likely to happen. Hence a greater proportion of molecules will have at least the activation energy to react.
How does an increase in concentration affect a Maxwell-Boltmann graph?
The curve peak would be higher.
What happens when you increase the pressure of a gas?
Molecules will be more tightly packed and closer together so more successful collisions are likely to happen. Hence a greater proportion of molecules will have at least the activation energy to react.
