science

Hexafluoroethane

Hexafluoroethane is a science 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 Hexafluoroethane rather than just read about it. In short: Hexafluoroethane is an organofluorine compound with the chemical formula C2F6. It is a non-flammable colorless odorless gas negligibly soluble in water and slightly soluble in methanol.

Key takeaways

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

Reference excerpt

Hexafluoroethane is an organofluorine compound with the chemical formula C2F6. It is a non-flammable colorless odorless gas negligibly soluble in water and slightly soluble in methanol. Its structure is F3C−CF3. It is an extremely potent and long-lived greenhouse gas. It is the perfluorocarbon counterpart to the hydrocarbon ethane.

Physical properties Hexafluoroethane's solid phase has two polymorphs. In the scientific literature, different phase transition temperatures have been stated. The latest works assign it at 103 K (−170 °C). Below 103 K it has a slightly disordered structure, and over the transition point, it has a body centered cubic structure. The critical point is at 19.89 °C (293.04 K) and 30.39 bar. Table of densities:

Vapor density is 4.823 (air = 1), specific gravity at 21 °C is 4.773 (air = 1) and specific volume at 21 °C is 0.1748 m3/kg.

Uses Hexafluoroethane is used as a versatile etchant in semiconductor manufacturing. It can be used for selective etching of metal silicides and oxides versus their metal substrates and also for etching of silicon dioxide over silicon. The primary aluminium and the semiconductor manufacturing industries are the major emitters of hexafluoroethane using the Hall-Héroult process. Together with trifluoromethane it is used in refrigerants R508A (61%) and R508B (54%). It is used as a tamponade to assist in retinal reattachment following vitreoretinal surgery.

Environmental effects

Due to the high energy of C−F bonds, hexafluoroethane is nearly inert and thus acts as an extremely stable greenhouse gas, with an atmospheric lifetime of 10,000 years (other sources: 500 years). It has a global warming potential (GWP) of 9200 and an ozone depletion potential (ODP) of 0. Hexafluoroethane is included in the IPCC list of greenhouse gases. Hexafluoroethane did not exist in significant amounts in the environment prior to industrial-scale manufacturing. Its absorption bands in the infrared part of the spectrum cause a radiative forcing of about 0.001 W/m2.

Health risks Due to its high relative density, it gathers in low-lying areas, and at high concentrations it can cause asphyxiation.

See also Carbon tetrafluoride Octafluoropropane Tetrafluoroethene Hexachloroethane

References

External links Purification process of hexafluoroethane Protocol for measurement of tetrafluoromethane and hexafluoroethane from primary aluminium production De Maré, G.R.; Panchenko, Yu. N. (March 2006). "Ab initio vibrational analysis of hexafluoroethane C2F6". Journal of Structural Chemistry. 47 (2): 232–240. doi:10.1007/s10947-006-0291-y. S2CID 96363970. Protocol for Measurement of Tetrafluoromethane (CF4) and Hexafluoroethane (C2F6) Emissions from Primary Aluminum Production Thermochemistry data table at chemnet.ru

Illustrations

Worked examples

Example 1 — a first encounter with Hexafluoroethane

Start with the simplest possible case. Write down what Hexafluoroethane claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, 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 Hexafluoroethane 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 Hexafluoroethane 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 Hexafluoroethane

In research: Hexafluoroethane appears in science 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 Hexafluoroethane 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: Hexafluoroethane is common in secondary-school and first-year university syllabi. It links to neighbouring topics Greenhouse gases, Haloethanes, Perfluoroalkanes, so understanding it makes those chapters shorter.
In everyday life: Look for Hexafluoroethane 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 Hexafluoroethane in 20 minutes

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

Frequently asked questions

What is Hexafluoroethane in simple terms?

Hexafluoroethane is an organofluorine compound with the chemical formula C2F6. It is a non-flammable colorless odorless gas negligibly soluble in water and slightly soluble in methanol.

Why does Hexafluoroethane matter?

Because it connects several science 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 Hexafluoroethane?

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 Hexafluoroethane.