AS-Level Chemistry: June 2017 Paper 1 PP

Question 1

Write the full Electron Configuration for each of the following Species:
Cl-
Fe2+

(2 marks)

Answer 1

Cl-: 1s2 2s2 2p6 3s2 3p6

Fe2+: 1s2 2s2 2p6 3s2 3p6 3d6

Question 2

Write an Equation, including State Symbols, to represent the process that occurs when the third Ionisation Energy of Manganese is Measured.

(1 mark)

Answer 2

Mn2+ (g) —–> Mn3+(g) + e-

Question 3

State which of the Elements Magnesium and Aluminium has the Lower First Ionisation Energy.
Explain your answer.

(3 marks)

Answer 3

-Aluminium.

-Outermost Electrons in 3p Orbital.

-Higher in Energy / Further away from the Nucleus than the Outermost Electrons in Magnesium.

Question 4

Write an Equation, including State Symbols, for the Reaction with an Enthalpy Change equal to the Enthalpy for Iron(III) Oxide.

(1 mark)

Answer 4

2Fe(s) + 3/2O2(g) —–> F32O3(s)

Question 5

Give the meaning of the term Electronegativity.

(1 mark)

Answer 5

The Power of an Atom to Attract a Pair of Electrons in a Covalent Bond.

Question 6

Explain how Permanent Dipole-Dipole Forces arise between Hydrogen Chloride Molecules.

(2 marks)

Answer 6

-Difference in Electronegativity leads to Bond Polarity.

-There is an Attraction between ∂+ on one Molecule & ∂- on the other.

Question 7

Copper can be Produced from rock that contains CuFeS2.

Suggest two reasons why the Sulfur Dioxide By-Product of this Process is removed from the exhaust gases.

(2 marks)

Answer 7

-Prevents Acid Rain.
-Toxic OR Causes Breathing Problems.

Question 8

Give the Oxidation State of Nitrogen in the following Species:

NO2 -

NO

(2 marks)

Answer 8

NO2 -: +3

NO: +2

Question 9

Write a Half-Equation for the conversion of NO2 - in an acidic solution into NO.

(1 mark)

Answer 9

NO2 - + e- +2H2 + —–> NO + H2O

Question 10

Write a Half-Equation for the conversion of I- into I2.

(1 mark)

Answer 10

2I- —–> I2 + 2e-

Question 11

Write an overall Ionic Equation for the Reaction of NO2 - in an Acidic Solution with I-.

(1 mark)

Answer 11

2NO2 - + 2I- + 4H+ —–> I2 + 2NO + 2H2O

Question 12

State the Role of NO2 - in the Reaction with I-.

(1 mark)

Answer 12

Oxidising Agent.

Question 13

Which is the correct Crystal Structure for the Substance named? (1)

A) Iodine: Simple Molecular
B) Diamond: Ionic
C) Sodium Chloride: Giant Covalent
D) Graphite: Metallic

Answer 13

A) Iodine: Simple Molecular

Question 14

Which is the best technique to remove the Silver Chloride that Forms when Aqueous Solutions of Silver Nitrate and Sodium Chloride React? (1)

A) Refluxing
B) Evaporation
C) Filtration
D) Distillation

Answer 14

C) Filtration

Question 15

Which statement about Astatine is Correct? (1)

A) Astatine has a Greater Electronegativity than Bromine.

B) Astatine is a Better Oxidising Agent than Bromine.

C) Astatine has a Greater Boiling Point than Bromine.

D) Astatine has a Greater First Ionisation Energy than Bromine.

Answer 15

C

Question 16

Which statement about Time of Flight Mass Spectrometry is correct? (1)

A) The Current in the Detector is Proportional to the Ion Abundance.

B) Sample Particles Gain Electrons to Form Positive Ions.

C) Particles are Detected in the Order of their Kinetic Energies.

D) Ions are Accelerated by a Magnetic Field.

Answer 16

A

Question 17

Chlorine exists as two Isotopes 35Cl and 37Cl in the ratio 3:1.
Which statement about Peaks in the Mass Spectrum of Cl2 is correct? (1)

A) Peaks at m/z = 70 and 74 in the ratio 3:1

B) Peaks at m/z = 70, 72 and 74 in the ratio 9:6:1

C) Peaks at m/z = 70, 72 and 74 in the ratio 9:3:1

D) Peaks at m/z = 7-0 and 72 in the ration 3:1

Answer 17

B

Question 18

A 4.85g sample of Anhydrous Sodium Sulfate is Dissolved in Water and the Solution made up to 250cm^3 in a Volumetric Flask.
What is the Concentration in Mol dm^-3 of Sodium Sulfate in the Solution? (1)

A) 0.0341

B) 0.137

C) 0.163

D) 0.273

Answer 18

B

Question 19

Which of these contains the greatest number of Atoms?

A) 127mg of Iodine

B) 1.54*10^-4 kg of Phosphorus

C) 81.0mg of Carbon Dioxide

D) 1.70*10^-4 kg of Ammonia

Answer 19

D

Question 20

A 20.0cm^3 sample of a 0.400mol dm^-3 Aqueous Solution of a Metal Bromide (MBrn) Reacts exactly with 160cm^3 of 0.100mol dm^-3 Aqueous Silver Nitrate.
What is the Formula of the Metal Bromide? (1)

A) MBr
B) MBr2
C) MBr3
D) MBr4

Answer 20

B

Question 21

Which Species has one or more Bond Angle(s) of 90’? (1)

A) CH4
B) NH4 +
C) ClF4 -
D) AlCl4 -

Answer 21

C

Question 22

The Forward Reaction in this Equilibrium is Endothermic.
COCl2(g) ⇌ CO(g) + Cl2(g)
Which statement is correct? (1)

A) If the Total Pressure is Increased at Constant Temperature, the Proportion of COCl2 in the Equilibrium Mixture will Decrease.

B) Use of a Catalyst will Increase the Proportion of COCl2 in the Equilibrium Mixture at Constant Temperature and Pressure.

C) Reducing the Equilibrium Concentration of CO will Increase the value of the Equilibrium Constant.

D) Raising the Temperature from 373K to 473K will Increase the value of the Equilibrium Constant.

Answer 22

D

Question 23

Which of these has the highest First Ionisation Energy? (1)

A) Na
B) Al
C) Si
D) Cl

Answer 23

D

Question 24

What is the Empirical Formula of an Oxide of Nitrogen that contains 26% Nitrogen by Mass? (1)

A) NO2
B) N2O3
C) N2O5
D) N4O5

Answer 24

C

Question 25

Which Species is not Produced by a Redox Reaction between Solid Sodium Iodide and Concentrated Sulfuric Acid? (1)

A) Na2SO4
B) H2S
C) S
D) SO2

Answer 25

A