``TOPIC 5 ERRORS

Rb Cl O4 name

rubidium chlorate (VII)

What numbers do we need for delta h

.4.18 x temperature change x volume of FINAL SOLUTION

What does iodine look like as a solid

I₂

Which compound requires the most energy to convert one mole into its gaseous ions?

A NaF

B Na2O

C MgF2

D MgO

D

If a reaction gives out heat, its…

exothermic, so delta (x) is negative

Write down the electron configuration of Zn2+

1s2 2s2 2p6 3s2 3p6 3d10

No electrons in 4s sub shell

Define the term ligand

Molecule / ion that has a lone electron pair that can form a dative / coordinate bond with a metal ion, forming a metal comp,ex, where both electrons in the electron pair are donated from the ligand

What bond angle do tetrahedral molecules have

109.5

Draw (Pt(CN)4)2- structure

(a) When concentrated hydrochloric acid i s added to aqueous copper (I!) sulfate, the solution colour

changes from blue, first t o green and then t o yellow.

Explain these colour changes. Include a n equation for the reaction involved.

[Cu(H2O)6]2+ (blue) + 4Cl- → reversibly [Cu(Cl)4]2- (yellow) + H2O

Cl- concentration increases as HCl is added

Equillibrium shifts to the right to oppose the change

Solution goes from blue to yellow

Bidentate ligand meaning

Two coordinate / dative bonds are formed by 2 lone electron pairs from the same ligand, with the same central transition metal ion

Cis vs trans isomer of complex metal ions in octahedral and square planar

Cis:

octahedral: same group are on same side of metal ion complex (90 degrees)

square planar: same group are adjacent

Trans:

Oct: same group on opposite sides (180 degrees)

Square palanar: same group on opposite sides

Draw and name both types of isomerism in [CoCl2(1,2 - diaminoethane)2]+

Co-ordination number

Number of coordinate bonds formed by ligands to the metal ion in the metal ion complex

How do square planar platinum metal complexes help with the treatment of cancer (2)

Cis isomer is cis platiin, only one isomer (cis) will work

Binds to DNA, preventing it from replication so cancer cells cannot divide

Coordinate bond definition

Covalent dative bond that is dodged between metal ion and ligand, where both electrons come from the same atom

Covalent bond definition

Attraction between a shared pair of electrons and the nuclei of two atoms

Explain the biological role of haemoglobin as an oxygen carrier in terms of ligand substitution (4)

Hb contains Fe2+ which forms an octahedral complex ion with O2 which can reversible substitute with H2O

HbO2 + H2O reversible to HbH2O + O2

In lungs at high o2 concentration, equilibrium shifts to left so o2 is picked up

At low o2 concentration at respiring tissues, equilibrium shifts to right so O2 is released

Colours of Fe3+ and Fe2+ precipitate with NaOH

Yellow and green

How to form and properly check colour of precipitate a (3)

Filter off precipitate

Wash with water to see colour clearly

Leave to dry

Why is COOH a worse ligand than COO-

Uncharged, less attracted to metal ion

How to reduce K2Cr2O7 2- to Cr3+

Add HCl (aq) and Zn (s)