Talk:Copper

Fire diamond inaccuracy

According to a website, the fire diamond is a level one health hazard and a level one fire hazard.

References

Production Chapter Errata

There are some errors in Copper#Methods chapter:

• Cuprous Sulfide Converts to Cuprous Oxide:

2 Cu₂S + 2 O₂ → 2 Cu₂O + 2 SO₂

• Production of blister copper:

2 Cu₂O + Cu₂S → 6 Cu + 2 SO₂

I can't edit article, please correct them. --DoroWolf (talk) 05:21, 29 March 2022 (UTC)

I can edit now. Help is no longer needed.--DoroWolf (talk) 06:17, 29 March 2022 (UTC)

Chemistry

Description of copper+air 119.2.125.166 (talk) 07:53, 26 June 2022 (UTC)

In Copper#Chemical it is explained that copper reacts with oxygen in the air to form an oxide. The kind of oxide that is formed depends on the environmental conditions. –LaundryPizza03 (dc̄) 11:38, 26 June 2022 (UTC)

Semi-protected edit request on 29 June 2022

An editor has accidentally used the Cyrillic letter с (Es) instead of the Latin letter c in two words in this article. This wasn't vandalism, just an error by an editor with a Cyrillic keyboard.

In the following text, both "сyprium" and "сuprum" are using the Cyrillic letter instead of the Latin one, which apart from being wrong causes the font's kerning to be off.

Please change the following:

''aes сyprium'' (metal of Cyprus), later corrupted to ''сuprum''

to the identically looking:

''aes cyprium'' (metal of Cyprus), later corrupted to ''cuprum''

31.209.210.42 (talk) 22:29, 29 June 2022 (UTC)

 Done Nice catch. --Kent G. Budge (talk) 23:55, 29 June 2022 (UTC)

Edit request (red color)

The "Physical" section contains the line "the energy difference between these shells corresponds to orange light.[citation needed]"

That should read "the energy difference between these shells corresponds to absorption of blue light."

The energy difference between the d & s shells corresponds to blue light. Reflected light without the blue makes the copper appear red.

Two citations are: https://www.flinnsci.com/api/library/Download485982234af046b491724d3736c93c51

and

http://ee.iitm.ac.in/~hsr/ec301/copper.pdf

1.159.58.220 (talk) 02:37, 17 October 2022 (UTC)

The flinnsci link leads to a 404 page. Do you have an archive or alternate link?

--MtPenguinMonster (talk) 05:25, 27 December 2022 (UTC)

Additionally, the other source mentions nothing about the energy levels of d & s electron shells, but it does say that blue light corresponds to the cutoff frequency of silver, not copper. Do you have a source which doesn't contradict your claim?

--MtPenguinMonster (talk) 05:38, 27 December 2022 (UTC)

 Not done for now: please establish a consensus for this alteration before using the {{Edit semi-protected}} template. Lemonaka (talk) 07:55, 27 December 2022 (UTC)

Today, the flinnsci pdf is at https://www.flinnsci.com/api/library/Download/485982234af046b491724d3736c93c51. If it moves again, you may be able to find it by searching for "when light is shined upon

copper metal, the copper atoms absorb some of the light in the blue-green region of the spectrum"

I'm sorry that it appears that the other pdf contradicts the claim. That's a misunderstanding of the paper. The flinnsci pdf is written for students with minimal scientific understanding, and the iitm.ac pdf is for people who already understand the subject.

permissible current density in air is incorrect

The maximum permissible current density of copper in open air is stated to be "approximately 3.1E6 A/m2 of cross-sectional area, above which it begins to heat excessively". I believe this to be incorrect by an order of magnitude (closer to 31E6 A/m^2). For example, for a, 18 AWG wire, with diameter of 0.001 m and area ~7.9E-7 m^2, the max current density would be 2.4 A = 3.1E6 A/m^2 * 7.9E-7 m^2. This is clearly not correct. The correct max current is ~ 24 A for a single 18 AWG wire in air (which corresponds to ~100C temperature, but rapidly increases in temperature with small increases in current). In summary, I believe the article should be corrected with 31.E6 rather than 3.1E6. 75.135.188.17 (talk) 13:19, 23 November 2022 (UTC)

Needs a WP:SCIRS source. Zefr (talk) 05:02, 24 November 2022 (UTC)

Semi-protected edit request on 12 January 2023

Blackwellj28 (talk) 17:41, 12 January 2023 (UTC)What copper can be made for 1.kitchen sinks   2.table tops 3. Jewelry 4. Door knobs and door handles 5. Railings 6. Tools 7. Musical instruments 8. Wire.

 Not done: it's not clear what changes you want to be made. Please mention the specific changes in a "change X to Y" format and provide a reliable source if appropriate. Cannolis (talk) 18:59, 12 January 2023 (UTC)

Semi-protected edit request on 20 January 2023

There is a grammatical error in the Folk-medicine section. Change: "In one trial for osteoarthritis and one trial for rheumatoid arthritis, no differences is found between copper bracelet and control (non-copper) bracelet." To: "In one trial for osteoarthritis and one trial for rheumatoid arthritis, no differences were found between copper bracelet and control (non-copper) bracelet." Shrekinspector (talk) 18:36, 20 January 2023 (UTC)

 Done–small jars tc 18:47, 20 January 2023 (UTC)

Wiki Education assignment: ERTH 4303 Resources of the Earth

This article was the subject of a Wiki Education Foundation-supported course assignment, between 13 January 2023 and 7 April 2023. Further details are available on the course page. Student editor(s): Hylaversicolor (article contribs).

— Assignment last updated by Hylaversicolor (talk) 00:37, 11 February 2023 (UTC)