transition metals

Question 1

How does a catalyst provide an alternative route with a lower activation energy?

Answer 1

Reactants aDsorbed on surface, catalyst provides an active site

Reaction occurs on surface - bond breaking or making. Catalyst aids bonds weakening.

Desorption of the product.

Question 2

How does Vanadium oxide act as a catalyst in the manufacture of sulfur trioxide? (2 eq.)

Answer 2

Question 3

How does Fe2+ catalyse the reaction between S2O82- and I- ?

Answer 3

Question 4

How does Mn2+ autocatalyse ?

Answer 4

Question 5

Why do complexes form coloured ions?

Answer 5

1. Certain frequencies of visible light are absorbed
2. To excite electrons in D orbital
3. Remaining wavelengths of light are REFLECTED

Question 6

Reactions of ions you need to know in aqueous solution with NaOH ( a base) and colours.

Answer 6

Fe 3 brown not purple

Question 7

Reactions of Al complex ions in aqueous solution as acid and base

Answer 7

Question 8

Reactions with NH3 and the known ions in aq sol. Cu2+ Fe2+ Fe3+ Al3+

Answer 8

Question 9

What is the exception when aq. ions react with NH3 and the colour change

Answer 9

Light blue to dark blue

Question 10

How do the M2+ ions react with carbonates in soloution

Answer 10

CuCO3 blue green

Question 11

How do the M3+ ions react with carbonates in soloution

Answer 11

Question 12

Reactions with Cl- and colour changes

Answer 12