Chemistry paper 2

Question 1

Predict which row is correct for selenium, Se.
melting
point / °C Structure Bonding
A 217 Simple molecular Covalent
B 1026 Giant Metallic
C –101 Simple molecular Covalent
D –157 Atomic Instantaneous dipole-induced dipole

Answer 1

A

Question 2

10 cm3 of 0.10 mol dm–3 HCl (aq) is added to 5 cm3 of 0.10 mol dm–3 NaOH(aq).
What is the pH of the resulting solution?
A 1.0
B 1.2
C 1.3
D 1.5

Answer 2

D

Question 3

Which statement(s) is/are correct about an orange dye?
1 Blue light is absorbed when electrons rise to higher energy levels.
2 Orange light is emitted when electrons drop to lower energy levels.
3 The dye absorbs orange light.
A 1, 2 and 3
B Only 1 and 2
C Only 2 and 3
D Only 1

Answer 3

D

Question 4

Which statement(s) is/are correct about nitrogen chemistry?
1 Ammonium compounds give off ammonia when warmed with alkalis.
2 The oxide N2O is brown.
3 Nitrate(V) ions can be oxidised to nitrate(III) ions.
A 1, 2 and 3
B Only 1 and 2
C Only 2 and 3
D Only 1

Answer 4

D