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Hello everyone.

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Welcome to the tutorial on Introduction to GChemPaint.

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In this tutorial, we will learn:

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*About  GChemPaint

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*Uses and Benefits

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*Installation

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*Open a new file

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*Menubar, Toolbar and Status bar.

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We will also learn about:

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*Display area

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*Document properties

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*Using tool box  and

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*Saving the drawing with extension .gchempaint.

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Here I am using

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Ubuntu Linux OS version. 12.04,

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GChemPaint version 0.12.10.

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To follow this tutorial you should  have knowledge of,

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basics of  Chemistry upto VIII standard.

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GChemPaint  can be very easily installed  using Ubuntu Software Center.

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For more information on Ubuntu software Center,

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please refer to Ubuntu Linux Tutorials on our website.

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What is GChemPaint?

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GChemPaint is a two dimensional chemical structure editor.

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It has a multiple document interface.

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GChemPaint allows you to,

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*Draw and display two dimensional chemical structures.

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*Drag and drop of templates

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*Change length, angle and width of the bonds

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*Use Chemical Calculator to calculate molecular weight  of  compounds.

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GChemPaint helps in:

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*Easy visualization of chemical structures

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*Converting two dimensional structures to three dimensional structures

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*Magnification of structures

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*Automatic and manual assignment of atoms.

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Let's first see how to open a new GChemPaint  application.

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Click on  Dash home >> Search bar appears >> In the Search bar type GChemPaint.

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Click on the  GChemPaint icon.

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We  can also open  GChemPaint  application from Terminal.

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Press Ctrl, Alt and T keys simultaneously, to open the Terminal.

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Type GChemPaint  and press Enter.

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GChemPaint application opens.

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A  typical GChemPaint  window looks like this.

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This is the Menu-bar.

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GChempaint has a standard menu-bar like other window based applications.

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Menu bar contain menu items like File, Edit, View, Tools, Windows and Help options.

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Toolbar contains most frequently used commands as icons.

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There are icons to open a New file,

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Open existing file,

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Save a file and Print a file.

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This is the Display area.

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Display area  shows the structures and the contents of the file that we draw and edit.

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We can drag and drop tools from toolbox  into the Display area.

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Status-bar displays information about current GChemPaint activity.

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It also displays contextual information about menu items.

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Now I will explain about Document Properties.

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To open Document Properties window,

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click on File menu.

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Navigate to Properties and click on it.

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Document Properties window opens.

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I will drag the Document Properties window to maximize it.

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Document properties window has the following fields.

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Title- Let's type the title of the document as “Propane”.

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Author's Name- let's type author's name as Madhuri.

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Email– Let's leave it blank.

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History – This field shows the Creation date of the document.

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It also shows the Revision date of  the document.

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This means, it also shows the next edited date of the document.

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Theme- let's leave this  field as GChemPaint.

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Comments- In the Comments field, we  can add  text related  to the document.

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Let's enter name of the compound and its formula.

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Propane CH3-CH2-CH3

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Let's click on Close button to close the window.

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Next let's learn about Toolbox.

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Toolbox contains buttons for different tools.

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Toolbox is displayed along with the active document window.

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Let's now draw structures using Toolbox buttons.

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Let's first draw the structure of propane.

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Propane is CH3-CH2-CH3

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Let's use Add a Chain tool from Tool box to draw a Carbon chain.

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Click on  Add a Chain tool,

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and then click on  Display area.

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A Carbon chain is drawn on the Display area.

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To change the orientation of the chain,

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click on  Add a Chain tool.

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In the Display area, click and hold the left mouse button to orient the chain.

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Do not release the left mouse button until the direction of the chain is fixed.

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Release the left mouse button after fixing the direction.

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We see that carbon chain is drawn.

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Note, once we click on the Display area, the chain length and orientation of the chain are fixed.

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Let's now display atoms at  each position on the chain.

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Here we have 3 positions to display atoms.

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Right click on the first  position,

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a Sub-menu opens.

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Select Atom and then click  on  Display symbol, to  display atoms at that position.

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Like wise, let's display atoms on all positions.

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Right click Select Atom.

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click  on  Display symbol.

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Here the structure of  “Propane” is drawn.

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Let's next draw a pentane structure on the same window.

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Click on Add a Chain tool,

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then click on  Display area.

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To increase the chain length, hold the left mouse button and drag the cursor.

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Change orientation in the desired direction and release the left mouse button.

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Let's display  atoms on all positions.

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Here we have 5 positions to display atoms.

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To display atoms on the first position,  right click. A sub-menu opens.

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Select  Atoms and then click on Display symbol.

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Like wise let's  display atoms on all positions.

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Here the structure of pentane is drawn.

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Let's now save the file.

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click on File Menu select Save as .

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Save As dialog box opens.

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For File type,  click on the drop down arrow.

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Various save formats are seen.

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Select 2D Chemical structure.

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Type the file name as propane.gchempaint,

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and click on Save button.

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File is saved with .gchempaint extension.

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With this, we come to the end of this tutorial.

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Let's summarize.

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In this tutorial we have learnt,

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*About GChemPaint

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*Uses and Benefits

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*Installation

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*Open a new file

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*Menu-bar, Toolbar and Status bar

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We have also learnt about:

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*Display area

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*Document Properties

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*Using tool box and

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*Save the drawing with extension  .gchempaint

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As an assignment I would like you to:

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1. Draw structures of n-hexane and n-octane

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2. Change the orientation

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3. Display atoms on each position

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Output of the assignment should look like this.

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Watch the video available at this URL:

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It summarizes the Spoken Tutorial project.

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If you do not have good bandwidth, you can download and watch it.

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The Spoken Tutorial Project Team:

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Conducts workshops using spoken tutorials

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Gives certificates to those who pass an online test.

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For more details, please write to contact@spoken-tutorial.org.

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Spoken Tutorial Project is a part of the Talk to a Teacher project.

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It is supported by the National Mission on Education through ICT, MHRD, Government of India.

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More information on this Mission is available at this link.

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This is Madhuri Ganpathi from IIT Bombay signing off. Thank you for joining.