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WorksheetsChemistry A2 Module 6.3 Foundations
Total questions: 15
Worksheet time: 11mins
In thin layer chromatography, the (a) value is a comparison between how far a component has moved compared to the solvent.
In thin layer chromatography, if a component has travelled 1.65cm from the baseline and the solvent has travelled 4.85cm. What is the Rf value?
(a)
In gas chromatography, the time taken for a component to travel from the inlet to the detector is called what?
(a)
What tests can identify an aldehyde?
Fehling's solution
Aqueous silver nitrate and ethanol
Tollen's reagent
Acidified potassium dichromate
What test would identify a ketone?
Fehling's solution
Tollen's reagent
Brady's reagent (2-4-DNP)
Acidified potassium dichromate
What is the chemical added as an internal standard in NMR?
(a)
State the unit of chemical shift in NMR:
(a)
How many peaks will be present in the 13C NMR spectra of propan-2-ol?
1
2
3
In Proton NMR, a doublet implies there are how many hydrogens attached to the neighbouring atom?
0
1
2
3
In the proton NMR spectra of methyl propanoate (CH3CH2COOCH3), what would you expect to see?
2 singlets and a triplet
1 singlet, 1 doublet and 1 triplet
1 singlet, 1 quartet and 1 triplet
2 triplets and 1 doublet
What is used in NMR spectroscopy to identify -OH and -NH protons?
(a)
How many peaks and in what ratio would you expect the proton NMR spectra of glycine (H2NCH2COOH) to have, run without D2O and with D2O?
With D2O: three peaks, in the ratio 2(H2N) : 2(CH2) : 1(COOH)
Without D2O: one peak only (CH2)
Without D2O: three peaks, in the ratio 2(H2N) : 2(CH2) : 1(COOH)
With D2O: one peak only (CH2)
Without D2O: two peaks, in the ratio 2(H2N) : 2(CH2) :
With D2O: one peak only (CH2)
How many peaks and in what ratio would you expect the Proton NMR spectra of lactic acid (CH3CHOHCOOH) to have, run without D2O and with D2O?
Without D2O: four peaks, in the ratio 3(CH3) : 1(CH) : 1(HO) : 1(COOH)
With D2O: two peaks, in the ratio 3(CH3) : 1(CH)
With D2O: four peaks, in the ratio 3(CH3) : 1(CH) : 1(HO) : 1(COOH)
Without D2O: two peaks, in the ratio 3(CH3) : 1(CH)
Without D2O: three peaks, in the ratio 3(CH3) : 1(CH) : 1(HO)
With D2O: two peaks, in the ratio 3(CH3) : 1(CH)
Deduction of the structures of organic compounds use different analytical data, including:
elemental analysis
Mass spectra
Infra red spectra
NMR spectra
In a proton NMR, a quartet and a doublet is observed, identify the sequence in the molecule that produces this splitting pattern.
CH3–CH2
CH2–CH
CH3–CH
CH2–CH2
