Question 19M.3.sl.TZ1.b(iii)
| Date | May 2019 | Marks available | [Maximum mark: 2] | Reference code | 19M.3.sl.TZ1.b(iii) |
| Level | sl | Paper | 3 | Time zone | TZ1 |
| Command term | Compare | Question number | b(iii) | Adapted from | N/A |
Physical properties of elements vary according to atomic number. Sections 6 to 9 of the data booklet list some of these properties.
Compare the ease of oxidation of s-block and d-block metals to their melting points and densities. Use section 25 of the data booklet.
[2]
Alternative 1:
«metals with» low densities oxidize easier [✔]
«metals with» low melting points oxidize easier [✔]
Alternative 2:
in s-block «metals with» high densities oxidize easier
OR
in s-block «metals with» low melting points oxidize easier [✔]
in d-block «metals with» low densities oxidize easier
OR
in d-block «metals with» low melting points oxidize easier [✔]
Note: Award [1 max] for “s-block metals more easily oxidized” OR “s-block metals have lower melting points” OR “s-block metals have lower densities”.
Accept “have greater activity” for “oxidize easier”.
Almost all candidates gained some credit on this question and many obtained full marks. Students were generally aware that s-block elements are more reactive than d-block ones and hence are more easily oxidised. Many correctly linked this to lower melting points and densities. Often a causal relationship was implied (more reactive because of their low density/mp) but this was not penalised. A significant minority of students referred to only one of the physical properties; not reading the question fully?
