Chemistry Paper 2 - Rates of reaction

quantity / time

10cm^3 of thiosulfate in a conical flask

place conical flask onto a black cross

10cm^3 of hydrochloric acid

swirl solution and start stopwatch

look at cross above the conical flask

stop the clock when you can not see the cross

repeat with lower concentration and find mean

Increased rate of collisions and increased rate of reaction

By providing a different pathway for the reaction that has a lower activation energy

minimum amount of energy needed for a reaction to take place