Topic A9: Transition Metals

No description yet. This curated deck is ready for daily study.

Total cards: 24•Content version: v4•Public deck•Updated: 8/1/2026

Card preview (24)

Front (Question)

Aqueous Fe2+ + NaOH/ ammonia

Back (Answer)

pale green —> dark green ppt dark green ppt reacts with oxygen to from brown-orange ppt

Front (Question)

Aqueous Fe2+ + excess NaOH/ ammonia

Back (Answer)

-dark green ppt is insoluble in excess ammonia and NaOH -hence, dark green ppt does not redissolve

Front (Question)

Aqueous Fe3+ + NaOH/ ammonia

Back (Answer)

pale yellow —> brown-orange ppt

Front (Question)

Aqueous Fe3+ + excess NaOH/ ammonia

Back (Answer)

-ppt is insoluble in excess ammonia and NaOH -hence, brown-orange ppt does not redissolve

Front (Question)

Aqueous Cu2+ + NaOH/ammonia

Back (Answer)

blue —> pale blue ppt

Front (Question)

Aqueous Cu2+ + excess NaOH/ ammonia

Back (Answer)

Ammonia -pale blue ppt is soluble in excess ammonia -hence redissolves to form dark/ deep blue solution NaOH -pale blue ppt is insoluble in excess NaOH -hence, pale blue ppt does not redissolve

Front (Question)

Aqueous Mn2+ + NaOH/ ammonia

Back (Answer)

pale pink —> pale brown ppt

Front (Question)

Aqueous Mn2+ + excess NaOH/ ammonia

Back (Answer)

-pale brown ppt is insoluble in excess ammonia and NaOH -hence, pale brown ppt does not redissolve

Front (Question)

Aqueous Cr3+ + NaOH/ ammonia

Back (Answer)

pale purple —> dark green ppt

#10

Front (Question)

Aqueous Cr3+ + excess NaOH/ ammonia

Back (Answer)

Ammonia -dark green ppt is soluble in excess ammonia -hence, dark green ppt redissolves to form purple solution NaOH -dark green ppt is soluble in excess NaOH -hence, dark green ppt redissolves to form dark green solution

#11

Front (Question)

What is a transition element?

Back (Answer)

d-block elements that form at least one ion with a partially filled d-orbital

#12

Front (Question)

When forming an atom, which order do the 3d and 4s orbitals fill?

Back (Answer)

4s orbitals fill first 3d orbitals fill second

#13

Front (Question)

When forming an ion, which order do the 3d and 4s orbitals empty?

Back (Answer)

4s orbital empties first 3d orbital empties second

#14

Front (Question)

What is different about the electron configuration of copper?

Back (Answer)

3d10 4s1 (usually 4s2)

#15

Front (Question)

What is different about the electron configuration of chromium?

Back (Answer)

3d5 4s1 (usually 4s2) -5 electrons in d-orbital provides stability

#16

Front (Question)

What are the 3 main properties of transition metals?

Back (Answer)

• form coloured compounds • elements and compounds act as catalysts • have variable oxidation states in compounds

#17

Front (Question)

Coloured compounds: Give example of 2 transition metals with different colours in their oxidation states (iron and chromium)

Back (Answer)

Iron (II) = pale-green Iron (III) = yellow Cr (III) = green Cr (VI) = yellow or orange

#18

Front (Question)

Catalysts: Give 2 examples of transition metals as catalysts

Back (Answer)

Heterogenous Ni (s) in hydrogenation reactions Homogenous Fe2+ (aq) in reaction of S2O8 2- (aq) + 2I-

#19

Front (Question)

Variable oxidation states: iron chlorides

Back (Answer)

iron (II) chloride iron (III) chloride

#20

Front (Question)

Ligand substitution of aqueous copper (II) ions with chloride ions [Cu(H2O)6]2+ + 4Cl- —>

Back (Answer)

blue solution —> yellow solution [CuCl4]2- + 6H2O

#21

Front (Question)

Aqueous chromium (III) ions + ammonia 2 Reaction steps

Back (Answer)

• dark green ppt forms • ppt dissolves in excess ammonia forming purple solution

#22

Front (Question)

Give example of ligand substitution in haemoglobin (when CO is breathed in)

Back (Answer)

-CO is breathed in -oxygen on haem group is replaced by CO -CO binds more strongly than oxygen (irreversibly) -prevents oxygen transport

#23

Front (Question)

What type of bond do ligands form with central cation?

Back (Answer)

dative covalent bonds

#24

Front (Question)

What is the coordination number of a complex ion?

Back (Answer)

the number of coordinate/ dative bonds to metal cation