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

Reagents which can be used in a test-tube test to distinguish aldehydes from ketones are:

(i) Tollen's reagent

(ii) 2,4-dinitrophenylhydrazine

(iii) Fehling's solution

(iv) sulfuric acid

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

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

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

3 / 10

The activation energy for the reaction of H₂_(g) with I₂_(g) is 120 kJ mol^-1. The standard enthalpy change for the reaction is +53 kJ mol^-1.

What is the activation energy for the decomposition of hydrogen iodide into its elements?

53 kJ mol^-1

67 kJ mol^-1

120 kJ mol^-1

173 kJ mol^-1

4 / 10

By inspection of this experimental data, what is the rate equation for this reaction?

rate = k [B]¹

rate = k [A]¹

rate = k [A]¹ [B]¹

rate = k [A]¹ [B]²

5 / 10

Consider the following reaction:

3NO_(g) => 2N₂O_(g) + NO_2(g)

The rate equation was found, by experiment:

rate = k [NO]²

Which of the following statements is/are true?

(i) There are two particles of the radical NO involved in the rate determining step

(ii) One particle of NO must be used up in a step that isn’t the rate determining step

(iii) Quadrupling [NO] raises the rate of nitrogen dioxide by, 2N₂O₂ production by 16 times

(iv) Tripling [NO] raises the rate of nitrous oxide, 2N₂O production by 8 times

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

6 / 10

These reactions are rapid at 298 K. Which of the reactions goes effectively to completion?

(i) I^-_(aq) + I₂_(aq) <=> I₃^-_(aq) K_c = 7.1 x 10^-² mol^-¹ dm³

(ii) Cu²⁺_(aq) + 4NH₃_(aq) <=> [Cu(NH₃)₄]²⁺_(aq) K_c = 1.4 x 10¹³ mol^-4dm¹²

(iii) 2H₂O_(l) <=> H₃O⁺_(aq) + OH^-_(aq) K_c = 1.0 x 10^-¹⁴ mol² dm^-⁶

(iv) Cu²⁺_(aq) + Zn_(s) <=> Cu_(s) + Zn²⁺_(aq) K_c = 1 x 10³⁷

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

7 / 10

For which of these changes is the enthalpy change the standard enthalpy of atomisation of bromine?

Br₂_(l) -> 2Br_(g)

Br₂_(g) -> 2Br_(g)

½ Br₂_(l) -> Br_(g)

½ Br₂_(g) -> Br_(g)

8 / 10

Which first-row d-block metal forms hydrated ions in the +3 state which undergo a ligand exchange reaction to form a deep red complex ion with thiocyanate ions, SCN^-.

vanadium

chromium

manganese

iron

9 / 10

Salt bridges are required for a cell E^ϴcell/V to be measured.

What statement best describes the action of a salt bridge?

The salt bridge allows cations and anions to flow from the bridge into each half-cell to ensure the electrical neutrality of each solution.

The salt bridge allows electrons to flow from one half-cell to the other, completing the circuit.

The salt bridge has an extremely high resistance to ensure that each half-cell remains in equilibrium.

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)

Which chemical species is the most powerful oxidising agent?

Li⁺_(aq)

Li_(s)

F_2(g)

F^-_(aq

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