Edexcel A-Level Chemistry AS 8.18 Experimental Procedures to Show I Patterns in the Thermal Decomposition of Group 1 And 2 Nitrates and Carbonates Students Questions

Practise Edexcel IAL Chemistry 8.18 by carrying out flame tests, identifying gases from observations, and evaluating Group 2 heating experiments.

Exam points

Describe flame testing with hydrochloric acid, a clean support and a non-luminous flame.
Identify NO₂, O₂ or CO₂ from colour, splint, limewater or acidity evidence.
Compare thermal decomposition using controlled heating, gas tests and apparatus limitations.

[Maximum number: 5]

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

(a)

A sample of solid anhydrous calcium nitrate, $\mathrm{Ca}\left(\mathrm{NO}_{3}\right)_{2}(\mathrm{~s})$ , is heated strongly for several minutes in the apparatus shown.

Figure for Question (a) — Edexcel A-Level Chemistry AS

[ 5 ]

(i)

State two observations that would be made.

1

2

[ 2 ]

(ii)

Explain why the observations from (c)(i) would be made more quickly if the experiment was repeated with solid anhydrous magnesium nitrate, $\mathrm{Mg}\left(\mathrm{NO}_{3}\right)_{2}(\mathrm{~s})$ .

[ 3 ]

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Edexcel A-Level Chemistry AS 8.18 Experimental Procedures to Show I Patterns in the Thermal Decomposition of Group 1 And 2 Nitrates and Carbonates Students Questions question 1

Question (a)

Question (i)

Question (ii)