The transition element Q has the electronic configuration $[\text{Ar}]\,3d^2\,4s^2$.
(a)[1]
Predict the oxidation states that element Q is likely to have in its compounds.
(b)[1]
Suggest why transition elements often have variable oxidation states in their compounds, whereas typical s-block elements such as calcium do not.
(c)[3]
Describe, with the help of a suitably labelled diagram, how an enzyme catalyses the breakdown of a substrate molecule.
Worked solution & mark scheme
This 5-mark question has a full step-by-step worked solution and mark scheme. One marking point: “+4 and one of +1, +2, +3 oxidation states” …
- Full mark scheme, point by point
- Step-by-step worked solution
- Write your answer & get it marked instantly by AI