Transition metals Flashcards Preview

OCR A-level Chemistry A > Transition metals > Flashcards

Flashcards in Transition metals Deck (19):
1

True transition metal definition

d-block elements forming at least one stable ion with partially filled d-sub shells (not Sc or Zn)

2

Ligand definition

a molecule or ion that donates a pair of electrons to a central metal ion to form a coordinate bond

3

Coordination number

the total number of coordinate bonds formed between the central metal ion and any ligands

4

EDTA 4- use

forms 6 coordinate bonds
detergents&foods as a stabiliser
prevents blood clotting

5

Use of cis-platin

important anti-cancer drug- prevents cell division

6

Cu 2+ solution colour

pale blue

7

Fe 2+ solution colour

pale green

8

Fe 3+ solution colour

pale yellow

9

Mn 2+ solution colour

pale pink

10

Cr 3+ solution colour

Violet
In presence of H2SO4=green

11

Cu 2+ with NaOH

pale blue ppt, Cu(OH)2

12

Fe 2+ with NaOH

green ppt, Fe(OH)2, oxidises to brown in air Fe(OH)3

13

Fe 3+ with NaOH

rusty brown ppt, Fe(OH)3

14

Mn 2+ with NaOH

light brown ppt, Mn(OH)2, darkens in air

15

Cr 3+ with NaOH

grey-green ppt, Cr(OH)3, soluble in excess [Cr(OH)6]3-

16

Transition metals with NH3

hydroxide ppt forms

17

Cu 2+ with excess NH3

royal blue solution, [Cu(NH3)4(H2O)2]2+

18

Cr 3+ with excess NH3

purple solution, [Cr(NH3)6]3+

19

Cu 2+ with conc. HCl

Yellow solution, [CuCl4]2-