All Analytical chemistry articles – Page 3

  • An image showing a cluster of contaminated magnetic stirrer bars of different sizes
    News

    Dirty stirrer bars can act as phantom catalysts

    2019-06-28T10:40:00Z

    Contaminated stirrer bars could be ruining experiments that are sensitive to tiny amounts of metal catalysts

  • An image showing asteroid Itokawa
    News

    Water found in asteroid dust

    2019-06-21T10:54:00Z

    Water detected in samples from an asteroid’s surface for the first time

  • An image showing a pop art style wallpaper, repeated images of a blue tongue sticking out of red lips, to illustrate an article on flavour chemistry
    Feature

    Edible chemistry

    2019-05-07T09:52:00Z

    Exploring the role of flavour chemists in the food and drink industry

  • AEArtboard 3AE
    Resource

    Transition 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. 

  • AEArtboard 2AE
    Resource

    Structure determination 16–18

    Practice interpreting 1H and 13C NMR, mass spectra, and thin layer chromatograms with these Starter for ten questions. 

  • AEArtboard 3AE
    Resource

    Analysis 16–18

    Practice using analysis skills with these mass spectrometry and infra-red spectroscopy Starter for ten questions. 

  • GC simple animation
    Resource

    Chromatography: Techniques

    Learn about two fundamental techniques underpinned by chromatography: high performance liquid chromatography (HPLC) and gas chromatography–mass spectrometry (GC-MS)

  • spin-spin coupling 3
    Resource

    Nuclear 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

  • electron promotion
    Resource

    Ultraviolet–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

  • bonding orbitals
    Resource

    Ultraviolet–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.

  • crystal field splitting
    Resource

    Ultraviolet–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.

  • IR regions
    Resource

    Infrared (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.

  • dipole moment
    Resource

    Infrared (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

  • dispersive spectrometer
    Resource

    Infrared (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

  • vibrational frequencies
    Resource

    Infrared (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.

  • electromagnetic radiation
    Resource

    Introduction 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.

  • adsorption chromatography
    Resource

    Chromatography

    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.

  • eye rods and cones
    Resource

    Ultraviolet–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.

  • mass spectrometer
    Resource

    Mass spectrometry (MS)

    Mass spectrometry is a powerful technique in the modern analytic laboratory. Learn the fundamental theory behind the operation of a mass spectrometer.

  • nuclear magnetic resonance
    Resource

    Nuclear magnetic resonance (NMR) spectroscopy

    Discover how nuclear magnetic resonance (NMR) spectroscopy works, with this series of topics breaking down the fundamental theory. Covering the electronic environment of atoms right up to demonstrating the practical identification of molecules. Includes examples and interactive simulations to aid understanding.