2 (a) Period 3 elements and their compounds show trends in their physical properties.
(i) On Fig. 2.1 sketch a graph to show the melting points of the first five elements in Period 3.
[Figure 2.1]
(ii) Complete Table 2.1 with information for sodium chloride and phosphorus(V) chloride.
Table 2.1
sodium chloride | phosphorus(V) chloride
---|---
state at room temperature |
name of change which
occurs on addition of water |
pH of final solution |
(b) Tennessine, Ts, is an unstable man-made element. It is found below astatine, At, in Group 17.
The chemical properties of Ts and its compounds have only been predicted.
(i) Suggest an equation for the reaction of NaTs and Br2. Assume that Ts follows the same
trends as the other elements in Group 17. Explain your answer.
equation
explanation

(ii) Some scientists predict that Ts has properties typical of metals like copper.
Complete Table 2.2 with:
• the predicted melting point of tennessine
• the lattice structure of solid chlorine, bromine and tennessine.
Assume that Ts has properties typical of metals like copper.
Table 2.2
| element | chlorine | bromine | tennessine |
|---|---|---|---|
| melting point/°C | -101 | -7.2 | |
| lattice structure
of crystalline solid | | | |

Q: What topic does this question test?

This question tests Chemical periodicity in A-Level Chemistry (syllabus code 9701). It is worth 10 marks.

Q: Which exam paper is this question from?

This question appeared in the Cambridge A-Level Chemistry May/June 2022 examination, Paper 2 Variant 3 (9701_s22_qp_23.pdf).

Question

2 (a) Period 3 elements and their compounds show trends in their physical properties.
(i) On Fig. 2.1 sketch a graph to show the melting points of the first five elements in Period 3.
[Figure 2.1]
(ii) Complete Table 2.1 with information for sodium chloride and phosphorus(V) chloride.
Table 2.1
sodium chloride | phosphorus(V) chloride
---|---
state at room temperature | 
name of change which
occurs on addition of water | 
pH of final solution | 
(b) Tennessine, Ts, is an unstable man-made element. It is found below astatine, At, in Group 17.
The chemical properties of Ts and its compounds have only been predicted.
(i) Suggest an equation for the reaction of NaTs and Br2. Assume that Ts follows the same
trends as the other elements in Group 17. Explain your answer.
equation
explanation

(ii) Some scientists predict that Ts has properties typical of metals like copper.
Complete Table 2.2 with:
• the predicted melting point of tennessine
• the lattice structure of solid chlorine, bromine and tennessine.
Assume that Ts has properties typical of metals like copper.
Table 2.2
| element | chlorine | bromine | tennessine |
|---|---|---|---|
| melting point/°C | -101 | -7.2 | |
| lattice structure
of crystalline solid | | | |

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