transition metals

Question 1

define amphoteric

Answer 1

the substance can react as an acid or base to form different compounds

Question 2

define base

Answer 2

reacts with acid to form salt and water

Question 3

define alkali

Answer 3

any base that is insoluble in water

Question 4

why are transition metals favoured as catalysts over metals

Answer 4

have the ability to change oxidation states -& can undergo reduction to oxidation

Question 5

what does a catalyst do

Answer 5

reduces the activation energy level required and provides a different energy route

Question 6

heterogenous catalysts

Answer 6

same state as the reactants

Question 7

homogenous catalysts

Answer 7

different state as the reactants

Question 8

how can the efficiency of catalysts be improved

Answer 8

increasing surface area of catalyst which can provide a larger area for the reaction to proceed efficiently

Question 9

what is the contact process?

Answer 9

sulphur is reacted with oxygen in order to make sulphuric acid

Question 10

what catalyst is used in the contact process?

Answer 10

vanadium oxide (V205)