Igcse Model Questions Vol1 2017 Chemistry Question 2

Practice practical question 2 from the 2017 Igcse Model Questions Vol1 Chemistry examination. This question covers Periodic table .

Igcse Model Questions Vol1 2017 Chemistry Practical
Topic: Periodic table
Question 2 IGCSE_MODEL_QUESTIONS_VOL1 • 2017 • CHEMISTRY • practical

A flame test was carried out on a number of metal salts. The observed flame colours are recorded in the table below. | Sample (metal salt) | Observed flame colour | |----------------------|-----------------------| | Sodium chloride (NaCl) | Bright yellow | | Potassium chloride (KCl) | Lilac (pale violet) | | Calcium chloride (CaCl₂) | Brick‑red | | Barium chloride (BaCl₂) | Apple‑green | | Copper(II) sulphate (CuSO₄) | Blue‑green | Answer the following questions.

Question Parts

( a )
Identify the metal ion responsible for each observed flame colour.
( b )
Explain why a flame test produces characteristic colours for different metal ions.
( c )
The first ionisation energies are: Na = 496 kJ mol⁻¹, K = 419 kJ mol⁻¹. Using periodic trends, explain why potassium has a lower ionisation energy than sodium.
( d )
Predict which metal, sodium or potassium, would react more vigorously with cold water and justify your answer using periodic trends.

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About This Question

This is Igcse Model Questions Vol1 2017 Chemistry Question 2. It is one of the practical questions from the 2017 Igcse Model Questions Vol1 Chemistry examination.

The question covers Periodic table .

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