This question is about the element calcium and some of its compounds. Calcium reacts with chlorine to form calcium chloride. (i) Explain, in terms of oxidation numbers, why this is a redox reaction. (2) ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ (ii) Complete the table to indicate the type(s) of bonding and structure in the species involved in this reaction. ................................................................................................................................................................................................................................................................................ YBY甘 SIHI NH BHYM ION OO (iii) State the expected flame colour when $$$\mathrm{CaCl}_{2}$$$ is used in a flame test. (1)

Chemistry

IGCSE&ALevel

EDEXCEL

Exam No：wch12-01-que-20240117 Year：2024 Question No：21(b)

Answer:

An explanation that makes reference to the following points:
- calcium/Ca oxidised and
from 0 (in Ca ) to ( + ) 2 (in $\mathrm{CaCl}_{2}$ )
- chlorine/ $\mathrm{Cl}_{2} / \mathrm{Cl}$ reduced
and
from 0 (in $\mathrm{Cl}_{2}$ ) to -1 (in $\mathrm{CaCl}_{2}$ )

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