Chemistry Year 13 Random Retrieval

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Chemistry Year 13 Random Retrieval

This quiz contains all the questions in the year 13 chemistry section. The website will pick 10 questions at random.

1 / 10

Which of these polymers would you expect to have the strongest intermolecular (interchain) forces as a result of the presence of polar covalent bonds?

2 / 10

In which of these reactions between pairs of reagents is the bond breaking homolytic?

(i) butan-1-ol with sodium bromide and concentrated sulfuric acid

(ii) catalytic cracking of hydrocarbons

(iii) bromine with ethene

(iv) bromine with hexane

3 / 10

What are the units of k for this reaction?

4 / 10

Consider the following equilibrium:

2SO2(g) + O2(g) <=>2SO3(g)

35.0 mol of 2SO2 was mixed with 22.5 mol of O2 and the mixture sealed in a heated vessel with vanadium (V) oxide catalyst. The mixture was left until no further observable change in composition took place. At this point, 15.0 mol of O2 was present in the mixture.

Calculate the value of the mole fraction of SO3 present in the mixture under these conditions

5 / 10

What enthalpy change is represented by the following equation?

Mg2+(g) + 2F-(g) => MgF2 (s)

6 / 10

What enthalpy change is represented by the following equation?

Cl(g) + e-=> Cl-(g)

7 / 10

From your calculation of ΔG in question 3, decide whether a solid dry sample of NaHCO3(s) will decompose or will be thermally stable in the oven at 100oC.

If this question is from a Random Retrieval, you can also carry out this calculation of Gibbs Energy change, ΔG, by first working out values for ΔSƟ and ΔHƟ by selecting the appropriate data from the ‘Selection of Thermodynamic Data’ in TOOLS.

8 / 10

Using oxidation numbers (states) work out the ratio of the species in the following half-equation.

Cr2O72- + H+ + e- => Cr3+

+H2O

9 / 10

What is the value of Eϴcell/V observed for a cell constructed from the following half-cells?

Mg2+(aq) + 2e- <=> Mg(s) Eϴcell/V = -2.37

Ag+(aq) + e- <=> Ag(s) Eϴcell/V = +0.80

10 / 10

For this question, look at the resource, ‘A Selection of Standard Electrode Potentials’ (‘A Selection of Standard Electrode Potentials’can be found in TOOLS>Data Sheets)

Under standard conditions, can Mg2+(aq) be reduced to Mg(s) by Ca(s)?

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