GChemPaint/C2/Formation-of-molecules/English-timed

Time	Narration
00:01	Hello everyone
00:02	Welcome the tutorial on Formation of molecules in GChemPaint.
00:08	In this tutorial, we will learn to-
00:11	* Add and modify structure of compounds
00:14	* Change current element
00:16	* Add Alkyl groups
00:18	* Add and modify carbon chain
00:21	Here I am using Ubuntu Linux OS version. 12.04 GChemPaint version 0.12.10.
00:33	To follow this tutorial you should be familiar with
00:38	GChemPaint chemical structure editor.
00:41	If not, for relevant tutorials, please visit our website.
00:47	Here is slide for the structures of Propane, Butane and Heptane.
00:54	I have opened a new GChemPaint application with Propane and Butane structures as shown in the slide.
01:03	Let's replace the terminal Carbon atoms in Butane structure with Chlorine atoms.
01:10	For this I will use Periodic table combo button.
01:15	Click on the Current element drop-down arrow button.
01:19	This button is known as Periodic table combo button.
01:23	Observe the built-in Modern periodic table.
01:27	Click on Cl from the table.
01:30	Observe Cl in the tool box.
01:33	Click on Add or modify an atom tool.
01:37	Click on the terminal atoms to replace them with Clorine (Cl) atoms.
01:43	The new structure obtained is 1,2-Dichloroethane.
01:48	Let's write its name below the structure.
01:52	Click on Add or modify a text tool.
01:56	Text tool's property page opens.
01:59	Click on the Display area below the structure.
02:03	You can see the blinking cursor enclosed in a green box.
02:08	Type 1,2-Dichloroethane in the box .
02:14	Click on Select one or more objects tool, to close the text tool's property page.
02:21	Next let's replace the central Carbon atom in Propane structure with Oxygen atom.
02:28	Place the cursor near the central atom of Propane structure.
02:33	Press capital O.
02:35	A Sub-menu with O and Os opens.
02:39	Select O.
02:40	Carbon and Hydrogen atoms will be replaced by Oxygen atom.
02:46	The new structure obtained is Dimethylether.
02:51	Let's write its name below the structure.
02:54	Click on Add or modify a text tool.
02:58	Click on the Display area below the structure.
03:01	Type Dimethylether in the box.
03:06	Let's save the file now.
03:08	Click on Save the current file icon on the toolbar.
03:12	Save as dialog box opens.
03:15	Enter the file name as Chloroethane-ether.
03:20	Click on Save button.
03:23	Let's Click on Close button to close the window.
03:27	Here is an assignment.
03:29	Draw 'Ethane and Pentane structures.
03:32	Replace one Carbon atom of Ethane with Br.
03:36	Replace the terminal Carbon atoms of Pentane with I.
03:41	Your completed assignment should look like this.
03:45	Now I will explain about Alkyl groups.
03:49	Alkyl group is a fragment of Alkane.
03:53	For example: Methyl CH3 is a fragment of Methane CH4
04:00	Successive members of an Alkyl group differ by a CH2 group.
04:06	Homologues of the Alkyl group series include,
04:10	Methyl CH3
04:15	Ethyl C2H5
04:20	Propyl C3H7
04:23	Butyl C4H9 and so on.
04:29	I have opened a new GChemPaint application with Heptane structure.
04:35	Now I will demonstrate how to number the carbon chain positions.
04:40	Numbering helps to identify the chain positions.
04:44	Click on Add or modify a text tool.
04:48	Click on the Display area near the first chain position.
04:52	Enter 1 in the green box.
04:55	Next, click near the second chain position.
04:59	Enter 2 in the box.
05:02	Likewise, I will number the other chain positions as 3, 4, 5, 6 and 7.
05:13	Now let's branch Heptane using Alkyl groups at various positions.
05:19	Let us add a Methyl group to the third position.
05:24	Click on Add a bond or change the multiplicity of existing one tool.
05:30	Click on the position.
05:32	Observe the change in the atoms.
05:36	Let us add an Ethyl group on the fifth position.
05:40	Click on Add a chain tool.
05:43	Click on the position.
05:46	Next I will display atoms on all positions.
05:51	Right-click on the position.
05:53	A Submenu opens.
05:55	Select Atom and then click on Display symbol.
05:59	Likewise, I will display atoms at other positions.
06:06	Let's see how many times we can branch at one position.
06:12	Click on Add a bond or change the multiplicity of existing one tool.
06:18	Click on the fourth position.
06:21	Click again.
06:23	Observe the branching in the Carbon chain.
06:27	Try to click for the third time.
06:30	We do not see the branching.
06:33	Note that branching is possible only twice at each position.
06:39	This is because it satisfies Carbon's tetra valency.
06:43	To save the file, press Ctrl+ S.
06:47	Save as dialog box opens.
06:50	Enter the file name as Alkyl Groups.
06:53	Click on Save button.
06:57	Let's summarize what we have learnt.
07:00	In this tutorial we have learnt to:
07:03	* Add and modify structure of compounds
07:07	* Change current element
07:09	* Add Alkyl groups
07:12	* Add and modify carbon chain
07:15	As an assignment,
07:16	* Draw Octane structure .
07:18	* Add Propyl and Butyl groups at the fourth and fifth positions of the chain.
07:25	Your completed assignment should look like this.
07:29	Watch the video available at this URL http://spoken-tutorial.org/What_is_a_Spoken_Tutorial.
07:33	It summarizes the Spoken Tutorial project.
07:38	If you do not have good bandwidth, you can download and watch it.
07:42	The Spoken Tutorial Project Team: Conducts workshops using spoken tutorials.
07:47	Gives certificates to those who pass an online test.
07:51	For more details, please write to contact@spoken-tutorial.org.
07:57	Spoken Tutorial Project is a part of the Talk to a Teacher project.
08:02	It is supported by the National Mission on Education through ICT, MHRD, Government of India.
08:09	More information on this Mission is available at this link http://spoken-tutorial.org/NMEICT-Intro
08:15	This brings us to the end of this tutorial.
08:19	Animation is done by Udhaya Chandrika.
08:22	This is Madhuri Ganpathi from IIT Bombay signing off. Thank you for joining.

Contributors and Content Editors

Gaurav, Pratik kamble, Sandhya.np14