Kinetics

Question 1

Heterogenous catalysts

Answer 1

Catalyst that is in a different state to the reactants
Increasing surface area of catalyst increases the rate of reaction

Question 2

Solid heterogenous catalyst

Answer 2

1. Reactant molecules arrive at surface of catalyst and bond with the solid catalyst (adsorption)
2. The bonds between the reactant atoms are weakened and broken up to form radicals which get together and make new molecules
3. New molecules are then detached from the catalyst (desorption)

Question 3

Homogenous catalyst

Answer 3

Same physical state as reactants
Reactants combine with the catalyst to make intermediate species which then reacts to form the products and reform the catalyst

Question 4

How homogenous catalyst works

Answer 4

Reactants combine with the catalyst to make an intermediate species which then reacts to form the products and reform the catalyst

Question 5

Give the main reason why after the end point was reached the temperature of the solution decreased

Answer 5

No further release of energy so colder solution being added cools the reaction mixture (added ethanoic acid is at a lower temperature than the reaction mixture)