3 marksUltra Violet-Visible (UV/VIS) Spectroscopy

CAPE Chemistry Unit 2 · 2010 · Paper 2 · Question 2(c)(i)

State three steps that must be followed when preparing a sample of organic compound X for UV/VIS spectroscopic analysis at 200 nm.

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2(a)(i)Define the term electromagnetic radiation.[1 mark]
2(a)(ii)Define the term wavelength.[1 mark]
2(a)(iii)Define the term frequency.[1 mark]
2(b)Using the formula ν = c / λ, calculate the missing values (i) wavelength for frequency 3 x 10^13 Hz and (ii) frequency for wavelength 3.16 m, and identify the…[4 marks]
2(c)(ii)State two properties of complexing reagents that make them suitable for use in UV/VIS analysis.[2 marks]
2(d)(i)Calculate the energy absorbed by one molecule of a compound where ν = 1.5 x 10^15 s^-1 (using E = hν, where h = 6.63 x 10^-34 J s).[1 mark]
2(d)(ii)Calculate the energy absorbed by one mole of the compound.[2 marks]

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