Neco Model Questions Vol1 2022 Chemistry Question 2

Practice practical question 2 from the 2022 Neco Model Questions Vol1 Chemistry examination. This question covers Periodic Table .

Neco Model Questions Vol1 2022 Chemistry Practical

Topic: Periodic Table

Question 2 NECO_MODEL_QUESTIONS_VOL1 • 2022 • CHEMISTRY • practical

A student performed a flame test on an unknown solid metal salt using a Bunsen burner and a handheld spectroscope. The dominant colour observed was a bright green and the spectroscope indicated that the most intense emission line had a wavelength of 520 nm. Reference data (wavelengths of the most intense flame‑colour line for selected metals): - Sodium (Na⁺): 589 nm (yellow) - Potassium (K⁺): 766 nm (violet‑lilac) - Calcium (Ca²⁺): 622 nm (brick‑red) - Barium (Ba²⁺): 553 nm (pale green) - Copper (Cu²⁺): 510 nm (bright green)

Question Parts

( a )

Calculate the energy, in joules, of a single photon corresponding to the observed wavelength of 520 nm. (Use h = 6.626 × 10⁻³⁴ J·s, c = 3.00 × 10⁸ m·s⁻¹.)

( b )

Identify the most likely metal ion present in the unknown sample by comparing the observed wavelength with the reference data provided.

( c )

Using the position of copper in the periodic table, explain why its flame colour is green, referring to the nature of the electronic transition responsible for the emission.

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About This Question

This is Neco Model Questions Vol1 2022 Chemistry Question 2. It is one of the practical questions from the 2022 Neco Model Questions Vol1 Chemistry examination.

The question covers Periodic Table .

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