Chemistry 9701/22 — October/November 2023
Cambridge AS Level · AS Level Structured Questions · worked solutions for every part, with the mark scheme
Topics Atomic Structure · Chemical Bonding · Equilibria · Hydrocarbons · States of Matter · Chemical Periodicity · +11 more
The elements silicon, phosphorus and sulfur are in Period 3 of the Periodic Table.
Describe the variation in atomic radius from silicon to sulfur.
The melting point of silicon is 1410°C. The melting point of sulfur is 113°C.
Explain this difference.
Table 1.1 shows some properties of the elements Si to S.
The first ionisation energy of P is not shown.
Table 1.1
| property | Si | P | S |
|---|---|---|---|
| total number of electrons in s subshells | |||
| total number of electrons in p subshells | |||
| first ionisation energy / kJ mol⁻¹ | 786 | 1000 | |
| formula of most common chloride | SiCl₄ | PCl₅ | SCl₂ |
Complete Table 1.1 to show the total number of s and p electrons in an atom of Si, P and S.
Construct an equation to represent the first ionisation energy of Si.
Three possible values for the first ionisation energy of P are given.
Circle the correct value.
Explain your choice, including a comparison of your chosen value to those of Si and S.
SiCl₄ and PCl₅ each react with water, forming misty fumes.
Identify the chemical responsible for the misty fumes.
Predict the shape of the SCl₂ molecule.
The rest of this paper
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