4.3 Collision Theory
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give the name for the minimum amount of energy required for the particles to react
Activation energy; EA
what happens when particles collide with less energy than the activation energy? [2 points]
they will not react, and the particles will just bounce off each other
List the 4 (5) factors that affect rate of collision
• surface area • concentration/ pressure • temperature • catalyst
why does higher solid SA increase rate of reaction? [3 points]
• more of the solid is exposed to other particles • so the collision frequency is higher • so there are more successful collisions per unit time
why does higher concentration/gas pressure increase rate of reaction? [3 points]
• more particles per unit volume • so collision frequency is higher • so there are more successful collisions per unit time
why does higher temperature increase rate of reaction? [3 points]
• particles have more kinetic energy • so % of collisions with enough energy is higher • so there are more successful collisions per unit time
why do catalysts increase rate of reaction? [3 points]
• provide an alternative route with a lower activation energy • so the % of collisions with enough energy is higher • resulting in more successful collisions per unit time
why does the graph for the disappearing cross expt. show a straight line through the origin? [2 marks]
M1 M2 rate is proportionall to concentration
name the catalyst used in the decomposition of hydrogen peroxide
manganese (iv) oxide
why do you put cotton wool at the top of a conical flask when reacting CaCO3 and HCl?
to prevent the acid from fizzing out
why may you re-use a catalyst after it has already been used?
as it is not.has not been used up in the previous experiment
what colour and state is manganese (iv) oxide? [2 points]
black solid
how to calculate rate from times taken?
1/time taken(s)
why doesn’t the graph for temperature have a straight LOBF that goes through the origin? [2 points]
M1 rate isn’t proportional to temperature and the rate isn’t zero at 0*C