File:33. Сребрено огледало.ogv

From Wikimedia Commons, the free media repository
Jump to navigation Jump to search

Original file ‎(Ogg multiplexed audio/video file, Theora/Vorbis, length 1 min 52 s, 1,920 × 1,080 pixels, 6.57 Mbps overall, file size: 87.92 MB)

Captions

Captions

Add a one-line explanation of what this file represents

Summary[edit]

Description
Македонски: Најнапред се подготвува Толенсовиот реагенс – [Ag(NH3)2]OH(aq), со капење концентриран раствор oд амонијак во раствор од сребро нитрат. На почетокот се образува кафеав талог, кој се раствора во вишок од NH4OH(aq):

2AgNO3(aq) + 2NH4OH(aq) = Ag2O(s) + 2NH4NO3(aq) + H2O(l)

Ag2O(s) + 4NH4OH(aq) = 2[Ag(NH3)2]OH(aq) + 3H2O(l)

Потоа, вака подготвениот Tоленсов реагенс се додава кон растворот од гликоза, епруветата се затвора и интензивно се клумка (меша) неколку минути. Во овој период се создава еднообразен слој од сребро на ѕидовите од епруветата во облик на огледало:

2[Ag(NH3)2]OH(aq) + HOCH2(CHOH)4CHO(aq) + 3H2O(l) = 2Ag(s) + 4NH4OH(aq) + HOCH2(CHOH)4COOH(aq)

Осмислено и изведено од Марина Стојановска, Миха Буклески и Владимир Петрушевски, Институт за хемија, ПМФ, УКИМ, Скопје.
English: Firstly the Tollens reagent – [Ag(NH3)2]OH(aq), is prepared by adding concentrated aqueous ammonia to a silver nitrate solution. In the beginning a dark brownish precipitate forms that dissolves in an excess of NH4OH(aq):

2AgNO3(aq) + 2NH4OH(aq) = Ag2O(s) + 2NH4NO3(aq) + H2O(l)

Ag2O(s) + 4NH4OH(aq) = 2[Ag(NH3)2]OH(aq) + 3H2O(l)

Then, the prepared Tollens reagent is added to the glucose solution, the test tube is stoppered and the mixture is shaken vigorously for several minutes. During this period a nice uniform layer of silver is formed on the test tube walls as a mirror:

2[Ag(NH3)2]OH(aq) + HOCH2(CHOH)4CHO(aq) + 3H2O(l) = 2Ag(s) + 4NH4OH(aq) + HOCH2(CHOH)4COOH(aq)

Planned and performed by Marina Stojanovska, Miha Bukleski and Vladimir Petruševski, Department of Chemistry, FNSM, Ss. Cyril and Methodius University, Skopje, Macedonia.
Date
Source Own work
Author Карас Студио

Licensing[edit]

I, the copyright holder of this work, hereby publish it under the following license:
w:en:Creative Commons
attribution share alike
This file is licensed under the Creative Commons Attribution-Share Alike 4.0 International license.
You are free:
  • to share – to copy, distribute and transmit the work
  • to remix – to adapt the work
Under the following conditions:
  • attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
  • share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.

File history

Click on a date/time to view the file as it appeared at that time.

Date/TimeThumbnailDimensionsUserComment
current12:29, 22 February 20201 min 52 s, 1,920 × 1,080 (87.92 MB)Инокентиј (talk | contribs)User created page with UploadWizard

You cannot overwrite this file.

The following page uses this file:

Transcode status

Update transcode status
Format Bitrate Download Status Encode time
VP9 1080P 2.73 Mbps Completed 21:20, 9 April 2024 7 min 9 s
Streaming 1080p (VP9) 2.64 Mbps Completed 00:25, 13 January 2024 3 min 14 s
VP9 720P 1.41 Mbps Completed 21:18, 9 April 2024 6 min 9 s
Streaming 720p (VP9) 1.33 Mbps Completed 23:45, 16 January 2024 1 min 45 s
VP9 480P 757 kbps Completed 21:15, 9 April 2024 3 min 3 s
Streaming 480p (VP9) 662 kbps Completed 20:28, 16 December 2023 1 min 21 s
VP9 360P 368 kbps Completed 21:14, 9 April 2024 2 min 2 s
Streaming 360p (VP9) 284 kbps Completed 08:27, 17 December 2023 46 s
VP9 240P 222 kbps Completed 21:13, 9 April 2024 1 min 54 s
Streaming 240p (VP9) 139 kbps Completed 20:03, 8 December 2023 35 s
WebM 360P 607 kbps Completed 11:03, 16 November 2023 38 s
Streaming 144p (MJPEG) 841 kbps Completed 23:48, 28 October 2023 6.0 s
Stereo (Opus) 87 kbps Completed 20:48, 11 November 2023 2.0 s
Stereo (MP3) 128 kbps Completed 18:05, 28 October 2023 3.0 s

File usage on other wikis

The following other wikis use this file:

Metadata

This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.

Retrieved from "https://commons.wikimedia.org/w/index.php?title=File:33._Сребрено_огледало.ogv&oldid=860935091"