All Analytical chemistry articles – Page 3
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IdeasStrategies for six-mark questions
Get your students practising answering these within the time limit
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NewsSmartphones modified to detect norovirus
Handheld detection system is sensitive enough to catch just a few particles of norovirus
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FeatureFreeing the world from chemical weapons
Chemists have helped destroy 97% of declared banned substances, finds Andy Extance, and are pushing to get the rest
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NewsPoly(ionic liquid)s act like taste buds for simple sugars
New system could find use in food monitoring or disease detection
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NewsDirty stirrer bars can act as phantom catalysts
Contaminated stirrer bars could be ruining experiments that are sensitive to tiny amounts of metal catalysts
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NewsWater found in asteroid dust
Water detected in samples from an asteroid’s surface for the first time
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NewsApp quantifies chemicals in thin-layer chromatography
A simple web app converts thin-layer chromatography into a quantitative analytical technique
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ResourceTransition metal chemistry 16–18
Help your students become proficient in answering questions on the transition metals with these Starter for ten questions including redox titrations, colourimetry, and catalysis.
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ResourceStructure determination 16–18
Practice interpreting 1H and 13C NMR, mass spectra, and thin layer chromatograms with these Starter for ten questions.
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ResourceAnalysis 16–18
Practice using analysis skills with these mass spectrometry and infra-red spectroscopy Starter for ten questions.
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ResourceChromatography: Techniques
Learn about two fundamental techniques underpinned by chromatography: high performance liquid chromatography (HPLC) and gas chromatography–mass spectrometry (GC-MS)
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ResourceNuclear magnetic resonance (NMR) spectroscopy: Hydrogen
Numclear magnetic resonance (NMR) is particularly useful in the identification of the positions of hydrogen atoms (1H) in molecules. This is an invaluable technique in the identification of organic compounds and commonly used in analytical laboratories
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ResourceUltraviolet–visible (UV-vis) spectroscopy: Explanation of colour
Why do some compounds appear certain colours? The electron configuration of transition metal complexes is essential in understanding their behaviour. Understand the theory of how d-orbitals influence colour through their shape and crystal field splitting
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ResourceUltraviolet–visible spectroscopy (UV-vis): The origin of colour in organic compounds
DIscover how unsaturation in organic compounds leads to colour. Such electon configuration allows transitions between orbitals of lower energy and antibonding orbitals occur when electromagnetic radiation of suitable energy is absorbed by the molecule.
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ResourceUltraviolet–visible (UV-vis) spectroscopy: Colour in transition metal compounds
Transition elements are found in the d-block of the periodic table and the most interesting feature of transition metal compounds is that most are highly coloured.
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ResourceInfrared (IR) spectroscopy: More complicated molecules
Learn about the fundamental physics responsible for the IR spectra of more complicated molecules. Bringing together vibrational modes, bond strengths and dipole moments — and how these translate to the recorded spectra.
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ResourceInfrared (IR) spectroscopy: Energy levels
Infrared spectroscopy reflects the type of bonding present within a molecule, learn how the energy levels of bond vibrations and dipole moments contribute to the frequencies observed
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ResourceInfrared (IR) spectroscopy: Uses of IR spectroscopy
Infrared spectroscopy is a valuable technique in analytical chemistry. Learn about how spectra arise and the instruments used to measure them
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ResourceInfrared (IR) spectroscopy
Absorption of infrared radiation brings about changes in molecular vibrations within molecules and ‘measurements’ of the ways in which bonds vibrate gives rise to infrared spectroscopy. Atom size, bond length and bond strength vary in molecules and so the frequency at which a particular bond absorbs infrared radiation will be different over a range of bonds and modes of vibration.