Catalysis

Question 1

Autocatalytic Reaction between Ethanedioate and Manganate ions overall equation

Answer 1

2MnO - +5C2O4 2- +16H+ ->2Mn2+ + 10CO +8H2O

Question 2

Autocatalytic Reaction between Ethanedioate and Manganate ions catalysed alternative route

Answer 2

Catalysed alternative route
Step1 4Mn2+ + MnO - +8H+ –> 5Mn3+ +4H O
Step2 2Mn3+ +C2O4 2- –>2Mn2+ +2CO

Question 3

Haber Process

Answer 3

Fe catalyst

N2 + 3H2 –> 2NH3

Question 4

which metals have to strong adsorption, to weak and just right

Answer 4

W too strong -products not released

Ag too weak- reactants not adsorb high enough conc

Ni/Pt right strength - most useful as catalysts

Question 5

How to catalysts increase reaction rates without getting used up

Answer 5

Provide alternative route with lower activation E

Question 6

Active site

Answer 6

place reactants adsorb onto the surface of the catalyst

• bonds within reactant weaker
• molecules held more reactive configuration
• higher conc reactants solid surface - leading higher collision frequency

Question 7

Steps in Heterogeneous catalysts

Answer 7

1) reactants form bonds with atoms active sites on surface catalyst - adsorbed
2) Bonds in reactants weakened + break
3) New bonds form bet reactants held close together on catalyst surface
4) This weakens bonds bet product and catalyst + product leaves- deabosrbs