Edexcel IAL Chemistry 8.17 Group 1 and 2 flame colours

Match the exact accepted colour to the ion, then explain that heat excites an electron and its return to a lower level releases a photon of characteristic energy.

Exam points

Identify Group 1 or 2 cations from their exact accepted flame-test colours.
Explain flame colour through excitation followed by emission during a downward transition.
Describe a clean flame-test method using hydrochloric acid and a non-luminous flame.

[Maximum number: 1]

This question is about the element calcium and some of its compounds.

Calcium reacts with chlorine to form calcium chloride.

\mathrm{Ca}(\mathrm{~s})+\mathrm{Cl}_{2}(\mathrm{~g}) \rightarrow \mathrm{CaCl}_{2}(\mathrm{~s})

State the expected flame colour when $\mathrm{CaCl}_{2}$ is used in a flame test.

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8.17—The formation of characteristic flame colours by Group 1 and 2 compounds in terms of electron transitions Students will be question 1