All Analysis articles – Page 2
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ResourceThe chemistry of chemical weapons
In this activity you will look at the chemistry behind a number of chemical weapons that have been employed throughout history
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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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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.
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NewsChemical analysis reveals origin of Pompeian mosaic tiles
Portable spectrometers shed light on the materials used in ancient Roman mosaics
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ResourceIntroduction to spectroscopy
Get back to basics with this primer on the principles of spectroscopic techniques, including infrared (IR), ultraviolet-visible (UV-vis) and nuclear magnetic resonance (NMR). To make it even easier, each technique has clear explanations and descriptions supported by animations.
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ResourceChromatography
Chromatography covers a broad range of physical methods used to separate and/or analyse complex mixtures. It can be preparative or analytical and has a wide range of applications.
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ResourceUltraviolet–visible (UV-vis) spectroscopy
Learn how UV-visible radiation can be used to shed light on chemical identification and how our senses percept colour. From the theory behind molecular orbitals and electronic transitions to the application of this technique with relatable examples. Includes examples and interactive simulations to aid understanding.