GChemPaint/C2/Formation-of-Bonds/English

Visual Cue	Narration
Slide Number 1 Title Slide	Hello everyone. Welcome the tutorial on Formation of bonds in GChemPaint.
Slide Number 2 Learning Objectives	In this tutorial, we will learn Add bonds to the existing bond Orient the bonds Add Stereochemical bonds Inverse wedge hashes
Slide Number 3 System Requirement	Here I am using Ubuntu Linux OS version. 12.04 GChemPaint version 0.12.10
Slide Number 4 Pre-requisites	To follow this tutorial you should be familiar with, GChemPaint chemical structure editor. If not, for relevant tutorials, please visit our website.
Switch to GChemPaint application.	I have opened a new GChemPaint application with Ethane structure.
	Let's learn to convert Saturated Hydrocarbons to Unsaturated Hydrocarbons.
Point to the Ethane structure.	Let's copy Ethane structure and paste it twice on the Display area.
Click on Select one or more objects tool to select Ethane.	Click on Select one or more objects tool to select Ethane structure.
Press CTRL +C to copy the structure Press CTRL + V to paste the copied structure	Press CTRL +C to copy the structure. Press CTRL + V to paste the copied structure Observe that two structures overlap each other.
Place the cursor on the structure >>drag it with the mouse.	Let's move the second overlapping structure aside. Place the cursor on the structure and drag it with the mouse.
Point to the bonds.	Observe the single bond between the carbon atoms in the structures.
	Let's first convert the single bond to a double bond.
Click on Add a bond or change the multiplicity of existing one tool.	Click on Add a bond or change the multiplicity of existing one tool.
Click on the existing bond of the second Ethane structure.	Click on the existing bond of the second Ethane structure.
Point to the structure. Point to the hydrogen atoms.	Observe that 1) Single bond is converted to a double bond. 2)Number of Hydrogen atoms reduced from 6 to 4. The new structure is Ethene.
	Next let's convert the single bond to a triple bond.
Click on the existing bond of the third Ethane structure twice.	Click on the existing bond of the third Ethane structure twice.
Point to the structure. Point to the Hydrogen atoms.	Observe that 1) Single bond is converted to a triple bond. 2)Number of hydrogen atoms reduced from 6 to 2. The new structure is Ethyne.
Click on Add or modify a text tool >>Click below the structures.	Let's name the structures. Click on Add or modify a text tool Click below the structures.
Enter the names in green boxes.	Enter the names of the structures as Ethane, Ethene and Ethyne in the green boxes.
Slide Number 5 Show slide on Tetrahedral Methane structure.	Next, let's learn about Tetrahedral geometry. Here is a slide for the Tetrahedral Methane structure.
	Now, let's draw Ethane structure.
Click on Add a bond or change the multiplicity of existing one tool>>Orient the bond in horizontal direction.	Click on Add a bond or change the multiplicity of existing one tool Orient the bond in horizontal direction.
Point to the bond	On the edge of each bond let's draw three bonds. Orient the bonds to form a Tetrahedral geometry.
Click on one edge>>orient the three bonds in different directions.	Click on one edge. Then orient the three bonds in different directions. Likewise let's draw for the other edge.
	Let's attach hydrogen atoms at the ends.
Press capital H >>a Submenu opens select H To attach Hydrogen atoms to the ends,	Press capital H. A submenu opens in which we will select H. Observe that Hydrogen atom appears in the tool box.
Click on Add or modify an atom tool Click on all the positions to add hydrogens.	Click on Add or modify an atom tool. Click on all the positions to add hydrogens.
	Let's now add Stereochemical bonds to Ethane structure.
Point to the Stereochemical bonds- Add a wedge bond, Add a hash bond, Add a squiggle bond and Add a fore bond.	Stereochemical bonds available in the tool box are, Add a wedge bond, Add a hash bond, Add a squiggle bond and Add a fore bond.
	Let's use Add a wedge bond to convert Ethane to a "Stereochemical" structure.
Click on Add a wedge bond. Click on all the bonds.	Click on Add a wedge bond. Click on all the bonds. Observe the changes.
	Now I will explain about Invert wedge hashes.
Go Edit menu, navigate to Preferences and click on it>> GChemPaint Preferences window opens.	Go Edit menu, navigate to Preferences and click on it. GChemPaint Preferences window opens.
Click on Inverse wedge hashes checkbox.	Click on Inverse wedge hashes checkbox.
Point to the structure.	If set, the wedge hashes bonds will follow the usual convention. Narrow end is at the start of the bond(centre of the structure) and broad end at the other end. This helps to visualize the bond correctly. Default convention in GChemPaint is inverse, because it is more consistent with perspective rules.
	Let's change the bonds to Add a hash bond in the Ethane structure.
Click on Add a hash bond. Click on all the bonds.	Click on Add a hash bond Click on all the bonds. Observe the changes.
	Let's save and close the file.
Click on Save the current file icon on the toolbar.	Click on Save the current file icon on the toolbar
Save as dialog box opens.	Save as dialog box opens.
Enter the file name as Formation of bond >>click on Save button.	Enter the file name as Formation of bond and then click on Save button.
Click on Close to close the file.	Click on Close to close the file.
	With this, we come to the end of this tutorial. Let's summarise.
Slide Number 6 Summary	In this tutorial we have learnt, Add bonds to the existing bond Orient the bonds Add Stereochemical bonds Inverse wedge hashes
Slide Number 7 Assignment	Assignment Convert Propane to Propyne Draw Propane and butane structures and Show the stereochemical bonds. Output of the assignment should look like this.
Slide Number 8 Acknowledgement	Watch the video available at this URL. http://spoken-tutorial.org /What_a_Spoken_Tutorial It summarises the Spoken Tutorial project If you do not have good bandwidth, you can download and watch it
Slide Number 11	The Spoken Tutorial Project Team: Conducts workshops using spoken tutorials Gives certificates to those who pass an online test For more details, please write to contact@spoken-tutorial.org
Slide number 12	Spoken Tutorial Project is a part of the Talk to a Teacher project It is supported by the National Mission on Education through ICT, MHRD, Government of India More information on this Mission is available at this link http://spoken-tutorial.org/NMEICT-Intro Animation is done by Udhaya Chandrika. This is Madhuri Ganpathi from IIT Bombay signing off. Thank you for joining.

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Madhurig