4.3.3 - effect of surface area

Question 1

for solids, increasing the surface area increases rate because:

Answer 1

• more of the solid is exposed to the other particles
• so the collision frequency is higher
• so there are more successful collisions per unit time

Question 2

how can you increase the surface area

Answer 2

crushing or grinding up the solid

Question 3

how is the effect of surface area on rate usually demonstrated?

Answer 3

by reacting calcium carbonate (marble) chips with hydrochloric acid

Question 4

variables of the marble chip experiment?

Answer 4

independent - sizes of CaCO3 chips
dependent - volume of CO2
control -
mass of CaCO3
volume and concentration of HCl
temperature

Question 5

in the marble chip experiment, how is the volume of CO2 measured?

Answer 5

using a gas syringe or inverted measuring cylinder in water