MC Unit 3 (QCAA)

In an open chemical system

• energy but not matter is exchanged with the surrounds.

• matter but not energy is exchanged with the surrounds.

• both matter and energy is exchanged with the surrounds.

• neither matter nor energy is exchanged with the suurounds.

Which of the following is an example of a redox reaction?

• The transfer of hydrogen ions between conjugate acid-base pairs.

• The transfer of electrons between conjugate acid-base pairs.

• The neutralisation of an acid to produce a conjugate base.

• The neutralisation of an amphoteric species.

• The equilibrium position will not change.

• The equilibrium position will move towards the reactants (left).

• The equilibrium position will move towards the products (right).

• It is impossible to predict the effect on the equilibrium position.

• -5

• -3

• +3

• +5

Determine the pH of a 0.15 M solution of hydrochloric acid (HCl)

• 0.15

• 0.71

• 0.82

• 1.41

Determine the relative strength of the following oxidising agents (from strongest to weakest) by comparing standard electrode potentials for the metal ions forming their respective metals.

Which one of the following acids can be classified as monoprotic?