Talk:Tetrafluoromethane

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Autoignition?[edit]

Carbon tetrafluoride is not flamable so I think it can not have autoignition temperature. — Preceding unsigned comment added by 83.23.192.44 (talk) 16:43, 1 August 2011 (UTC)


Attempt at article rewrite[edit]

I am no expert on this gas, but I do know that fluorine is an element that breaks lots of trends but I don't know if CF4 has the same effects as compounds like CCl4 on the ozone layer. I would appreciate it if someone could clarify this article. -x42bn6 Talk 09:15, 3 September 2005 (UTC)

Fluorine is too strongly attached to affect the ozone layer. The Ozone depletion article says that the main human derived ozone depleters are Cl and Br. njh 11:10, 18 February 2006 (UTC)

Naming[edit]

I like "carbon tetrafluoride" better.

I like "fizzywhubbletizdofluspigun", but it's probably best to stick with IUPAC standard nomenclature as perwikipolicy. njh 11:10, 18 February 2006 (UTC)
Both are IUPAC standard nomenclature: unfortunately, an article cannot have two titles. Physchim62 (talk) 09:09, 19 February 2006 (UTC)


Error in link redirection?[edit]

Excuse me, but I arrived to this article redirected from the voice "SS-5 'Skean' (R-14)" in the voice "Strategic Rocket Forces". It seems there's an error in the redirection. Bye!

Fixed. It now goes to R-14 Usovaya. --Ed (Edgar181) 23:30, 24 July 2006 (UTC)
R-14 Usovaya has just been moved to R-14 Chusovaya for misspelling reasons Garsd (talk) 10:20, 31 July 2012 (UTC)

CFC-14 Redirect[edit]

There's a lot of bullshit links to this page. Some ignorant person keeps linking a redirect called CFC-14 here, constantly reverting any attempt I make at fixing the problem, despite the fact that there is obviously NO chlorine in tetrafluromethane. I guess thats the "new science" that goes along with crap like replacing AD with CE and woman with womyn...Zaphraud (talk) 02:32, 12 December 2007 (UTC)

Please mind your civility & do not engage in personal attacks. Blanking or replacing a redirect with "this is wrong" is not fixing the problem. This article claims that CFC 14 is an alternate name. If that's wrong, that's what needs to be fixed. Your summary of events also ignores the RFD deletion debate. -- JLaTondre 11:45, 12 December 2007 (UTC)

CFC-14 originally redirected to Carbon tetrachloride. After a RFD debate, it was re-targeted here. Zaphraud objects to that. However, this article states that CFC 14 is an alternate name. In addition, carbon tetrafluoride also redirects here and the article has that as one of its IUPAC names. This and this Oxford University page seem pretty clear in showing CFC-14 & carbon tetrafluoride as synonymous with tetrafluoromethane. A quick google search also shows that CFC-14 is equated with tetrafluoromethane. Based on all that, I closed the RFD as a re-target to this page.
If the article and above sources are incorrect, then this article needs to be fixed & the redirects removed. However, the CFC-14 shouldn't be removed on its own and the remainder left. That would simply be masking any real problem with the article being wrong. -- JLaTondre 11:45, 12 December 2007 (UTC)

CFC-14 is used to refer to tetraflouromethane. See for example these books: [1], [2], [3]. --Itub (talk) 12:30, 12 December 2007 (UTC)
To be fair, other books use FC-14: [4], [5]. Both are in common use, regardless of the lack of chlorine atoms in CF4. But in any case, redirects are added for usability reasons, not to make statements about nomenclature (for example, we also have redirects for common typos). Therefore the redirect should stay. See WP:REDIRECT for more information about the purpose of redirects. --Itub (talk) 12:48, 12 December 2007 (UTC)

The formally correct code would be PFC-14, as used for all perfluorocarbons. A description of all codes is in haloalkane. I edited the table there to show the common but as pointed out above incorrect use of cfc-14 and hf-14 as well. Wim van Dorst (Talk) 14:47, 23 December 2007 (UTC).

dropping off physical data[edit]

to improve readability, here is the burdensome (IMHO) physical data -- Additional physical properties --

Property Value
Density (ρ) at −196 °C (solid) 1.943 g.cm−3
Density (ρ) at -183 °C 1.89 g.cm−3
Density (ρ) at −127.8 °C (liquid) 1.603 g.cm−3
Density (ρ) at −80 °C (gas) 1.317 kg.m-3
Density (ρ) at 15 °C (gas) 3.72 kg.m−3
Density (ρ) at 21 °C (gas) 3.858 kg.m−3
Triple point temperature (Tt) −183.7 °C (89.4 K)
Critical temperature (Tc) −45.5 °C (227.6 K)
Critical pressure (pc) 3.793 MPa (37.43 bar)
Critical volume (Vc) 0.142 dm3.mol−1
Critical compressibility (Zc) 2.77
Latent heat of fusion (lf) at triple point 8.09 kJ.kg−1
Latent heat of vaporization (lv) at −127.8 °C 135.7 kJ.kg−1
Specific heat capacity at constant pressure (cp) at 30 °C 58 J.mol−1.K−1
Specific heat capacity at constant pressure (cp) at -145 °C 80.08 J.mol−1.K−1
Specific heat capacity at constant volume (cv) at 30 °C 49 J.mol−1.K−1
Heat capacity ratio (κ) at 30 °C 1.178571
Compressibility Factor (Z) at 15 °C 0.9981
Acentric factor (ω) 0.177
Dipole moment 0 D
Viscosity (η) at 0 °C 16.1 μPa.s (0.0161 cP)
Viscosity (η) at −60.3 °C 17.0 μPa.s (0.0170 cP)
Surface tension (σ) at −80 °C 6.4 mN.m−1
Thermal conductivity (λ) at 0 °C 15.03 mW.m−1.K−1

perhaps a separate data page should exist as it does for tetrafluoroethane. -Shootbamboo (talk) 23:25, 29 November 2008 (UTC)

also, here is this data "At a temperature of −198 °C, it has monoclinic structure with lattice constants a = 8.597, b = 4.433, c = 8.381 (.10-1 nm), β = 118.73°[1]."
seems like if people want that data they would go to the chemical table of inorganic compounds, and not a free online encyclopedia. -Shootbamboo (talk) 23:30, 29 November 2008 (UTC)

Health Effects?[edit]

Where did the information that "long term exposure can cause severe heart damage" come from? All the many Safety Data Sheets I have read state no long term exposure effects. 81.154.242.90 (talk) 13:51, 19 July 2013 (UTC)

I agree. Asphixiation yes, other effects I have never heard of. I notice there are no references. F2Andy (talk) 07:03, 19 May 2014 (UTC)

I've removed the statements about the health risks. The accepted policy relating to health claims in WP articles is that they fall under [WP:MEDRS] guidelines, that is they should be substantiated by secondary reputable medical sources. This type of claim definitely falls under this guideline. The OP is free to reinstate this with the correct supporting evidence. TerryE (talk) 11:43, 21 February 2015 (UTC)
    • ^ F. Brezina, J. Mollin, R. Pastorek, Z. Sindelar. Chemicke tabulky anorganickych sloucenin (Chemical tables of inorganic compounds). SNTL, 1986.