Which does not involve the absorption of ultraviolet radiation or visible light?
A The blue appearance of copper(II) sulfate solution in daylight - AQA - A-Level Chemistry - Question 7 - 2021 - Paper 3
Question 7
Which does not involve the absorption of ultraviolet radiation or visible light?
A The blue appearance of copper(II) sulfate solution in daylight.
B The breakdown ... show full transcript
Worked Solution & Example Answer:Which does not involve the absorption of ultraviolet radiation or visible light?
A The blue appearance of copper(II) sulfate solution in daylight - AQA - A-Level Chemistry - Question 7 - 2021 - Paper 3
Step 1
A The blue appearance of copper(II) sulfate solution in daylight.
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Answer
The blue appearance of copper(II) sulfate in daylight results from the absorption of certain wavelengths of visible light, specifically in the red part of the spectrum, which allows it to reflect blue light, hence indicating that it involves absorption.
Step 2
B The breakdown of ozone in the upper atmosphere.
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The breakdown of ozone (O₃) in the upper atmosphere occurs due to the absorption of ultraviolet radiation. Ozone absorbs UV light, which leads to its dissociation into oxygen molecules and free oxygen atoms.
Step 3
C The ionisation of a molecule in a mass spectrometer.
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The ionisation of a molecule in a mass spectrometer does not necessarily involve the absorption of ultraviolet radiation or visible light. Instead, it often involves the use of high-energy electrons or other methods to remove an electron from the molecule.
Step 4
D The reaction between chlorine and methane at room temperature.
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The reaction between chlorine and methane at room temperature does not require the absorption of UV or visible light. This reaction can proceed through free radical mechanisms initiated by heat or other means.
