15.3

Question 1

what is the colour of vanadium in the +2 oxidation state

Answer 1

violet

Question 2

what is the colour of vanadium in the +3 state

Answer 2

green

Question 3

what is the colour of vanadium in the +4 oxidation state

Answer 3

blue

Question 4

what is the colour of vanadium in the +5 oxidation state

Answer 4

yellow

Question 5

why does a green solution form between vanadium oxidation state +5 and +4 `

Answer 5

+5 is yellow and +4 is blue therefor they mix together to form a temporary green solution until all the vanadium is reduced to +4

Question 6

what is a heterogenous catalyst

Answer 6

one that is in a different phase from the reactants

Question 7

what is adsorption

Answer 7

the process that occurs when reactants form weak bonds with a solid catalyst

Question 8

what is desorption

Answer 8

the process that occurs when products leave the surface of a solid catalyst

Question 9

what is the equation for the conversion of sulfur dioxide to sulfur trioxide and what catalyst is used

Answer 9

2SO2 + O2 <=> 2SO3
vanadium(V) oxide

Question 10

state the 3 steps involving how a heterogenous catalyst works

Answer 10

• adsorption in which one or more reactants become attached to the surface of the catalyst
• reaction in which the bonds are weakened of the adsorbed reactants
• desorption in which the product becomes detached from the surface of the catalyst