chemistry paper 1 a levle questions

Question 1

define enthalpy of lattice formation

Answer 1

Enthalpy change or heat energy change when 1 mol of solid
ionic compound/substance or 1 mol of ionic lattice

is formed from its gaseous ions.

Question 2

Describe a test you could carry out in a test tube to distinguish between sodium
oxide and p4o10

Answer 2

React with water / add water / solution (of substances in
question) 1 If no M1 then CE = 0/3
Add litmus paper / universal indicator / measure pH (with pH
meter)
1 Allow other reagents in solution, eg sodium carbonate solution,
that give a positive result
Allow other indicators with appropriate colour changes
M3 is dependent on M2
Litmus: blue with sodium oxide

Question 3

state the type of crystal structure shows inn sillicon dioxide and in sulfur trioxide

Answer 3

giant covalent and simple covalentr

Question 4

explain why sillicon dioxide has a higher melting point than suldur trioxide

Answer 4

Covalent bonds (between atoms) in SiO2
Van der Waals between molecules / intermolecular forces in
SO3
Covalent bonds are stronger than van der Waals forces
) take more energy to be overcome/broken or
(Van der Waals) take less energy to be overcome/broken

Question 5

Solution A contains the compound [Cu(H2O)6]Cl2
0 7 . 1 State the type of bonding between the oxygen and hydrogen in this compound.

Answer 5

Covalent

Question 6

State why the chloride ions in this compound are not considered to be ligands.

Answer 6

Cl(-) not donating lone pair (to Cu(2+))
Cl(-) does not form a coordinate/dative bond (to Cu(2+))