factors affecting rate

Question 1

what 2 properties are required for collisions to be successful?

Answer 1

sufficient energy
correct orientation

Question 2

why are most collisions unsuccessful?

Answer 2

because it is very rare that particles will collide in the correct orientation

Question 3

what can you do to increase the rate of reaction?

Answer 3

increase the frequency of collisions

increase the proportion of collisions that are successful

Question 4

how can you increase the proportion of successful collisions?

Answer 4

change the energy of particles

change the orientation or particles

Question 5

what are the 4 factors that can affect rate?

Answer 5

temp
surface area
catalysts
concentration/pressure

Question 6

what is a method we can use to measure the effect of surface area on rate of reaction for CaCO3 and HCl using mass change?

Answer 6

1) measure 25cm^3 of HCl into a conical flask
2) record mass of apparatus
3) record mass of CaCO3
4) add CaCO3 to HCl on balance
5) start timing
6) record mass every 20s until reaction ceases
7) repeat with EQUAL mass of CaCO3 powder