(i) Write what is meant by the term catalyst? (ii) Give one further chemical property shown by transition elements that Group I elements do not show.
Give two physical properties shown by transition elements that are not shown by Group I elements.
(i) Complete the diagram by adding the formulae of the products. Include state symbols. (ii) Draw an arrow on the diagram to show the activation energy. (iii) Is the reaction endothermic or exothermic? Explain your answer.
On the diagram, add the energy profile for the catalysed reaction.
(i) Write an ionic half-equation for the reaction at the negative electrode (cathode). Include state symbols. (ii) Describe what the student observes at the negative electrode. (iii) Give two other observations made by the student during the electrolysis. (iv) What difference would the student observe at the positive electrode if the aqueous copper(II) sulfate were replaced by concentrated aqueous copper(II) chloride?