chemistry

Perfluorooctanesulfonamide

Perfluorooctanesulfonamide 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 Perfluorooctanesulfonamide rather than just read about it. In short: Perfluorooctanesulfonamide (PFOSA) is a synthetic organofluorine compound. It is a fluorocarbon derivative and a perfluorinated compound, having an eight-carbon chain and a terminal sulfonamide functional group.

Key takeaways

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

Reference excerpt

Perfluorooctanesulfonamide (PFOSA) is a synthetic organofluorine compound. It is a fluorocarbon derivative and a perfluorinated compound, having an eight-carbon chain and a terminal sulfonamide functional group. PFOSA, a persistent organic pollutant, was an ingredient in 3M's former Scotchgard formulation from 1956 until 2003, and the compound was used to repel grease and water in food packaging along with other consumer applications. It breaks down to form perfluorooctane sulfonate (PFOS). PFOSA can be synthesized via the nucleophilic substitution of POSF with liquid ammonia or by a two step reaction via an azide followed by reduction with Zn and HCl. PFOSA is also a metabolic by-product of N-alkylated perfluorooctanesulfonamides. For example, N-ethyl perfluorooctanesulfonamidoethanol (N-EtFOSE), which was primarily used on paper, and N-methyl perfluorooctanesulfonamidoethanol (N-MeFOSE), which was primarily used on carpets and textiles, both metabolize via acetates to PFOSA. In addition, PFOSA is thought to be the biologically active form of the insecticide Sulfluramid (N-ethyl perfluorooctanesulfonamide) as it is an extremely potent uncoupler of oxidative phosphorylation with an IC50 of about 1 micromolar (≈500 nanograms per milliliter or parts per billion). PFOSA was the most toxic perfluorinated compound in a study with PC12 cells. Concentrations ranged from 10 to 250 micromolar in the study (or 5000 to 125,000 parts per billion). Wildlife biomonitoring studies have found the highest level of PFOSA in the liver of common dolphin (Mediterranean Sea, Italy) with a concentration of 878 parts per billion; the liver of mink from Illinois, US, contained 590 parts per billion. In fish, the highest levels detected were in the liver of Norway Pike (91 parts per billion) and homogenates of slimy sculpin (150 parts per billion) from Lake Ontario. Differences in biotransformation across species could explain some of its presence. In humans, PFOSA has been detected in sub- to low-parts per billion levels; for example, in 1999–2000 US serum samples, the 95th percentile (or value where only 5% of the population was higher) was 1.4 parts per billion while in 2003–2004 the 95th percentile fell to 0.2 parts per billion. However, whole-blood concentrations are about five times higher than those in blood plasma or serum.

Illustrations

Worked examples

Example 1 — a first encounter with Perfluorooctanesulfonamide

Start with the simplest possible case. Write down what Perfluorooctanesulfonamide 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 Perfluorooctanesulfonamide 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 Perfluorooctanesulfonamide 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 Perfluorooctanesulfonamide

In research: Perfluorooctanesulfonamide 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 Perfluorooctanesulfonamide 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: Perfluorooctanesulfonamide is common in secondary-school and first-year university syllabi. It links to neighbouring topics Perfluorinated compounds, Sulfonamides, so understanding it makes those chapters shorter.
In everyday life: Look for Perfluorooctanesulfonamide 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 Perfluorooctanesulfonamide in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Perfluorooctanesulfonamide 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 Perfluorooctanesulfonamide out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Perfluorooctanesulfonamide in simple terms?

Why does Perfluorooctanesulfonamide 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 Perfluorooctanesulfonamide?

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 Perfluorooctanesulfonamide.