DP Chemistry (first assessment 2025)
Question 21M.2.SL.TZ1.c(iv)
| Date | May 2021 | Marks available | [Maximum mark: 1] | Reference code | 21M.2.SL.TZ1.c(iv) |
| Level | SL | Paper | 2 | Time zone | TZ1 |
| Command term | Suggest | Question number | c(iv) | Adapted from | N/A |
c(iv).
[Maximum mark: 1]
21M.2.SL.TZ1.c(iv)
Suggest why chemists find it convenient to classify bonding into ionic, covalent and metallic.
[1]
Markscheme
allows them to explain the properties of different compounds/substances
OR
enables them to generalise about substances
OR
enables them to make predictions ✔
Accept other valid answers.
Syllabus sections
Structure 2. Models of bonding and structure » Structure 2.2—The covalent model » Structure 2.2.1—A covalent bond is formed by the electrostatic attraction between a shared pair of electrons and the positively charged nuclei. The octet rule refers to the tendency of atoms to gain a valence shell with a total of 8 electrons. Deduce the Lewis formula of molecules and ions for up to four electron pairs on each atom.
Structure 2. Models of bonding and structure » Structure 2.1—The ionic model » Structure 2.1.2—The ionic bond is formed by electrostatic attractions between oppositely charged ions. Deduce the formula and name of an ionic compound from its component ions, including polyatomic ions. Binary ionic compounds are named with the cation first, followed by the anion. The anion adopts the suffix “ide”. Interconvert names and formulas of binary ionic compounds.