chemistry

Instrumental chemistry

Instrumental chemistry is a chemistry topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Instrumental chemistry rather than just read about it. In short: Instrumental analysis is a field of analytical chemistry that investigates analytes using scientific instruments. Spectroscopy Spectroscopy measures the interaction of the molecules with electromagnetic radiation.

Key takeaways

Instrumental chemistry belongs to chemistry; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Instrumental chemistry to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Instrumental chemistry from memory before moving on to harder problems.

Reference excerpt

Instrumental analysis is a field of analytical chemistry that investigates analytes using scientific instruments.

Spectroscopy

Spectroscopy measures the interaction of the molecules with electromagnetic radiation. Spectroscopy consists of many different applications such as atomic absorption spectroscopy, atomic emission spectroscopy, ultraviolet-visible spectroscopy, X-ray fluorescence spectroscopy, infrared spectroscopy, Raman spectroscopy, nuclear magnetic resonance spectroscopy, photoemission spectroscopy, Mössbauer spectroscopy, and circular dichroism spectroscopy.

Nuclear spectroscopy

Methods of nuclear spectroscopy use properties of a nucleus to probe a material's properties, especially the material's local structure. Common methods include nuclear magnetic resonance spectroscopy (NMR), Mössbauer spectroscopy (MBS), and perturbed angular correlation (PAC).

Mass spectrometry

Mass spectrometry measures mass-to-charge ratio of molecules using electric and magnetic fields. There are several ionization methods: electron ionization, chemical ionization, electrospray, fast atom bombardment, matrix-assisted laser desorption/ionization, and others. Also, mass spectrometry is categorized by approaches of mass analyzers: magnetic-sector, quadrupole mass analyzer, quadrupole ion trap, time-of-flight, Fourier transform ion cyclotron resonance, and so on.

Crystallography

Crystallography is a technique that characterizes the chemical structure of materials at the atomic level by analyzing the diffraction patterns of electromagnetic radiation or particles that have been deflected by atoms in the material. X-rays are most commonly used. From the raw data, the relative placement of atoms in space may be determined.

Electrochemical analysis

Electroanalytical methods measure the electric potential in volts and/or the electric current in amps in an electrochemical cell containing the analyte. These methods can be categorized according to which aspects of the cell are controlled and which are measured. The three main categories are potentiometry (the difference in electrode potentials is measured), coulometry (the cell's current is measured over time), and voltammetry (the cell's current is measured while actively altering the cell's potential).

Thermal analysis

Calorimetry and thermogravimetric analysis measure the interaction of a material and heat.

Separation

Separation processes are used to decrease the complexity of material mixtures. Chromatography and electrophoresis are representative of this field.

Hybrid techniques Combinations of the above techniques produce "hybrid" or "hyphenated" techniques. Several examples are in popular use today and new hybrid techniques are under development. Hyphenated separation techniques refer to a combination of two or more techniques to separate chemicals from solutions and detect them. Most often, the other technique is some form of chromatography. Hyphenated techniques are widely used in chemistry and biochemistry. A slash is sometimes used instead of hyphen, especially if the name of one of the methods contains a hyphen itself. Examples of hyphenated techniques:

Gas chromatography-mass spectrometry (GC-MS) Liquid chromatography–mass spectrometry (LC-MS) Liquid chromatography-infrared spectroscopy (LC-IR) High-performance liquid chromatography/electrospray ionization-mass spectrometry (HPLC/ESI-MS) Chromatography-diode-array detection (LC-DAD) Capillary electrophoresis-mass spectrometry (CE-MS) Capillary electrophoresis-ultraviolet-visible spectroscopy (CE-UV) Ion-mobility spectrometry–mass spectrometry Prolate trochoidal mass spectrometer

Microscopy

The visualization of single molecules, single biological cells, biological tissues and nanomaterials is very important and attractive approach in analytical science. Also, hybridization with other traditional analytical tools is revolutionizing analytical science. Microscopy can be categorized into three different fields: optical microscopy, electron microscopy, and scanning probe microscopy. Recently, this field has been rapidly progressing because of the rapid development of the computer and camera industries.

Lab-on-a-chip

Devices that integrate multiple laboratory functions on a single chip of only a few square millimeters or centimeters in size and that are capable of handling extremely small fluid volumes down to less than picoliters.

See also Characterization (materials science)

References

Illustrations

Worked examples

Example 1 — a first encounter with Instrumental chemistry

Start with the simplest possible case. Write down what Instrumental chemistry claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In chemistry, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Instrumental chemistry before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Instrumental chemistry ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Instrumental chemistry

In research: Instrumental chemistry appears in chemistry research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Instrumental chemistry in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Instrumental chemistry is common in secondary-school and first-year university syllabi. It links to neighbouring topics Analytical chemistry, Instrumental analysis, so understanding it makes those chapters shorter.
In everyday life: Look for Instrumental chemistry outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Instrumental chemistry in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Instrumental chemistry means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Instrumental chemistry out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Instrumental chemistry in simple terms?

Instrumental analysis is a field of analytical chemistry that investigates analytes using scientific instruments. Spectroscopy Spectroscopy measures the interaction of the molecules with electromagnetic radiation.

Why does Instrumental chemistry matter?

Because it connects several chemistry ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Instrumental chemistry?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Instrumental chemistry.