Questions And Worked Solutions For Chemistry WCH11 January 2022
IAL Chemistry WCH11 January 2022 Questions - Complete Paper (pdf)
- Element X is in Group 2 of the Periodic Table and element Y is in Group 7.
X and Y are not the symbols of the elements.
(a) What is the formula of the compound formed from X and Y?
(b) Under what conditions does the compound formed from X and Y
- Which of these compounds would you expect to have the highest melting temperature?
- A drop of an aqueous solution of green copper(II) chromate(VI) is placed in the centre
of a strip of damp filter paper.
The ends of the filter paper are connected to a DC power supply.
What is observed after a few minutes?
- Which of these isoelectronic ions has the smallest ionic radius?
- Which properties of a cation result in the greatest polarising power?
- Which properties of an anion result in it being most easily polarised?
- What is the ionic equation for the reaction between aqueous solutions of
barium nitrate and sodium sulfate?
- Which of these molecules is not polar?
- The concentration of nitrogen dioxide in a sample of air is 0.5ppm.
What is the percentage of nitrogen dioxide molecules in this sample of air?
- Ethane reacts with bromine in the presence of ultraviolet radiation.
(a) What is the equation for the reaction?
(b) The ultraviolet radiation is needed for
- All alkanes have the same
- A single molecule of decane, C10H22, is cracked.
Which of these mixtures could not be formed?
- How many structural isomers have the formula C3H6C2?
- The equation for the complete combustion of hexane is shown.
- Which pollutant cannot form when alkane fuels are burned in car engines?
- Iron(III) oxide is reduced by hydrogen in a two-step process
- Which of these solutions contains the greatest number of ions?
- Potassium chlorate(V) decomposes on heating to form oxygen.
- This question is about the amount of water of crystallisation in
hydrated magnesium sulfate, MgSO4xH2O.
(a) The value of x in the formula was determined in an experiment.
Step 1 A crucible was weighed, a spatula measure of hydrated magnesium sulfate
was added and the crucible was reweighed.
Step 2 The crucible containing the hydrated magnesium sulfate was heated using
the apparatus shown.
Step 3 After heating for two minutes, the crucible containing the
magnesium sulfate was allowed to cool and was reweighed.
- This question is about copper and its compounds
- This question is about alkenes.
Alkenes contain a carbon to carbon double bond that consists of a σ bond and a
(a) Complete the diagram to show the areas of electron density for each bond.
Label the σ bond and the π bond.
- This question is about the bonding in the elements of Period 3 in the Periodic Table.
The melting temperatures of the Period 3 elements are shown in the table
- This question is about the ionisation energies of the elements in Period 2 of the
(a) The first ionisation energies of the Period 2 elements are shown
(i) Give an equation that represents the first ionisation energy of lithium.
Include state symbols.
(ii) Explain why there is a general increase in the first ionisation energy across
(iii) Explain why the first ionisation energy of oxygen is lower than that of nitrogen.
- A 0.210g sample of a volatile organic liquid C is injected into a gas syringe and
heated in an oven.
At 100kPa and 358K, the syringe contains 72.5cm3
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