tag:blogger.com,1999:blog-77192127170114541792024-03-13T11:49:59.914-07:00IB Chemistry HLmimhttp://www.blogger.com/profile/00658758413634852092noreply@blogger.comBlogger4125tag:blogger.com,1999:blog-7719212717011454179.post-4650306864060569492012-02-23T06:33:00.001-08:002012-02-23T06:45:54.537-08:00Videos<iframe allowfullscreen="" frameborder="0" height="360" src="http://www.youtube.com/embed/CDTZoFGmZoc" width="480"></iframe><br />
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<iframe width="560" height="315" src="http://www.youtube.com/embed/i3FCHVlSZc4" frameborder="0" allowfullscreen></iframe>mimhttp://www.blogger.com/profile/00658758413634852092noreply@blogger.com0tag:blogger.com,1999:blog-7719212717011454179.post-64384261014024010012012-02-19T08:04:00.000-08:002012-02-19T08:24:23.807-08:00TAKE A BREAK !This is how you can have fun while learning chemistry :D<br />
Enjoy !!<br />
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<div class="separator" style="clear: both; text-align: center;"><a href="http://4.bp.blogspot.com/-d858ZQds-so/T0EdfXGNSlI/AAAAAAAAAE4/VdxhJc7m4UY/s1600/ponies_in_organic_chemistry_by_evilglen-d3bw8ew.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="313" src="http://4.bp.blogspot.com/-d858ZQds-so/T0EdfXGNSlI/AAAAAAAAAE4/VdxhJc7m4UY/s400/ponies_in_organic_chemistry_by_evilglen-d3bw8ew.png" width="400" /></a></div>mimhttp://www.blogger.com/profile/00658758413634852092noreply@blogger.com0tag:blogger.com,1999:blog-7719212717011454179.post-27384369158897504912012-02-16T09:01:00.000-08:002012-02-16T09:35:49.524-08:00VSPER Web ExercisesHere are some questions to challenge yourself based on the previous notes given .<br />
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This link will lead you to the question with the solutions and some tips to tackle the questions.<br />
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<div style="text-align: center;"><b><span style="color: red; font-size: large;"><a href="http://www.austincc.edu/mohan/documents/Ch09_Sample_Exercise.pdf" target="_blank">CLICK HERE</a></span></b></div><b><br />
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<b><u>Example Questions :</u></b><br />
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<div class="MsoNormal"><span style="font-family: Arial; font-size: small;"><b>1. Based on VSEPR model, which of the following molecule(s) is (are) planar</b></span></div><div class="MsoNormal"><span style="font-family: Arial; font-size: small;"><br />
</span></div><div class="MsoNormal"><span style="font-family: Arial; font-size: small;"> <b>i</b>. NH<sub>3</sub> </span></div><div class="MsoNormal"><span style="font-family: Arial;"> <b>ii</b></span><span style="font-family: Arial;">.</span><span style="font-family: Arial;"> </span><span style="font-family: Arial;"> </span><span style="font-family: Arial;">BF</span><sub style="font-family: Arial;">3</sub><span style="font-family: Arial;"> </span><span style="font-family: Arial;"> </span></div><div class="MsoNormal"><span style="font-family: Arial;"><b>iii</b>.</span><span style="font-family: Arial;"> </span><span style="font-family: Arial;"> </span><span style="font-family: Arial;">CH</span><sub style="font-family: Arial;">4</sub></div><div class="MsoNormal"><span style="font-family: Arial; font-size: small;"><sub><br />
</sub></span></div><div class="MsoNormal"><span style="font-family: Arial; font-size: small;"><b>A.</b> i only </span></div><div class="MsoNormal"><span style="font-family: Arial; font-size: small;"><b>B</b>. ii only </span></div><div class="MsoNormal"><span style="font-family: Arial; font-size: small;"><b>C</b>. iii only </span><span style="font-family: Arial; font-size: x-small;">Answer : <b>B</b></span></div><div class="MsoNormal"><span style="font-family: Arial;"><b style="font-size: medium;">D</b>. i & ii<o:p style="font-size: medium;"> </o:p> <b style="font-size: medium;"> </b></span></div><div class="MsoNormal"><span style="font-family: Arial; font-size: small;"><b>E</b>. ii & iii</span></div><div class="MsoNormal"><span style="font-family: Arial; font-size: small;"><b>F</b>. None of the above. </span></div><br />
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Explanation :<br />
- <span style="font-family: Arial;">NH</span><sub style="font-family: Arial;">3 -</sub><span style="font-family: Arial;"> </span><span style="background-color: white; font-family: arial, helvetica, clean, sans-serif; font-size: 13px; line-height: 16px;">there is a </span><span class="yshortcuts cs4-visible" id="lw_1329410518_0" style="background-color: white; border-bottom-color: rgb(54, 99, 136); border-bottom-style: dotted; border-bottom-width: 2px; cursor: pointer; font-family: arial, helvetica, clean, sans-serif; font-size: 13px; line-height: 16px;">lone pair</span><span style="background-color: white; font-family: arial, helvetica, clean, sans-serif; font-size: 13px; line-height: 16px;"> in the outer shell of the central N </span><span class="yshortcuts cs4-visible" id="lw_1329410518_1" style="background-color: white; border-bottom-color: rgb(54, 99, 136); border-bottom-style: dotted; border-bottom-width: 2px; cursor: pointer; font-family: arial, helvetica, clean, sans-serif; font-size: 13px; line-height: 16px;">atom</span><span style="background-color: white; font-family: arial, helvetica, clean, sans-serif; font-size: 13px; line-height: 16px;"> of </span><span class="yshortcuts cs4-visible" id="lw_1329410518_2" style="background-color: white; border-bottom-color: rgb(54, 99, 136); border-bottom-style: dotted; border-bottom-width: 2px; cursor: pointer; font-family: arial, helvetica, clean, sans-serif; font-size: 13px; line-height: 16px;">NH3</span><span style="background-color: white; font-family: arial, helvetica, clean, sans-serif; font-size: 13px; line-height: 16px;">. </span><br />
<span style="background-color: white; color: #333333; font-family: arial, helvetica, clean, sans-serif; font-size: 13px; line-height: 16px;">In NH3 the N has 3 bond pairs and 1 lone pair, (4 total pairs). The shape is called trigonal pyramidal (approximately tetrahedral minus one atom).</span><br />
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</span></div><div><span style="background-color: white; color: #333333; font-family: arial, helvetica, clean, sans-serif; font-size: 13px; line-height: 16px;">- </span><span style="background-color: white; color: #333333; font-family: arial, helvetica, clean, sans-serif; font-size: 13px; line-height: 16px;"> </span><span style="font-family: Arial;">BF</span><sub style="font-family: Arial;">3 - </sub><span style="background-color: white; color: #333333; font-family: arial, helvetica, clean, sans-serif; font-size: 13px; line-height: 16px;">shape is trigonal planar. You know that B is the central atom, and the F's are on the outside. </span><span style="background-color: white; color: #333333; font-family: arial, helvetica, clean, sans-serif; font-size: 13px; line-height: 16px;">After you draw it out, you'll notice it has 0 lone pairs, and 3 bonding pairs, thus making it a trigonal planar.</span></div><div><span style="background-color: white; color: #333333; font-family: arial, helvetica, clean, sans-serif; font-size: 13px; line-height: 16px;"><br />
</span></div><div class="separator" style="clear: both; text-align: center;"><a href="http://2.bp.blogspot.com/-erpm38MmnJE/Tz00NEVityI/AAAAAAAAAEg/INejQ8mzcrA/s1600/aaaaaaaaaaa.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="http://2.bp.blogspot.com/-erpm38MmnJE/Tz00NEVityI/AAAAAAAAAEg/INejQ8mzcrA/s1600/aaaaaaaaaaa.jpg" /></a></div><div><span style="background-color: white; color: #333333; font-family: arial, helvetica, clean, sans-serif; font-size: 13px; line-height: 16px;"><br />
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</span></div><div><span style="background-color: white; color: #333333; font-family: arial, helvetica, clean, sans-serif; font-size: 13px; line-height: 16px;">- </span><span style="font-family: Arial;">CH</span><sub style="font-family: Arial;">4 - tetrahedral.</sub><br />
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<b><sub style="font-family: Arial;">2. What is the arrangement of electron pairs and molecular structure of using </sub><span style="background-color: white;">SF</span><sub style="background-color: white;">4</sub><span style="font-family: Arial; vertical-align: sub;"> VSPER theory ?</span></b><br />
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<span style="font-family: Arial; vertical-align: sub;">Answer : The arrangement is trigonal bipyramidal and the molecular structure is see-saw shape.</span><br />
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<b><span style="font-family: Arial; vertical-align: sub;">3. Draw the geometric structure of<span style="font-size: x-small;"> </span></span><span style="font-size: x-small;"><span style="background-color: white; font-family: Arial; text-align: -webkit-center;">PCl</span><sub style="background-color: white; font-family: Arial; text-align: -webkit-center;">5</sub></span><sub style="background-color: white; color: #ff0080; font-family: Arial; text-align: -webkit-center;"> </sub><span style="font-family: Arial;">using VSPER theory.</span></b><br />
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<span style="font-family: Arial;">Answer :</span><br />
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<div class="separator" style="clear: both; text-align: center;"><a href="http://1.bp.blogspot.com/-dMX9ubUfluo/Tz0-Lsp0y3I/AAAAAAAAAEo/koMrEu4xFDY/s1600/images+(10).jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="http://1.bp.blogspot.com/-dMX9ubUfluo/Tz0-Lsp0y3I/AAAAAAAAAEo/koMrEu4xFDY/s1600/images+(10).jpg" /></a></div><br />
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<span style="font-family: Arial; vertical-align: sub;"><span style="background-color: white; font-family: 'Times New Roman'; text-align: -webkit-left;">5 + (5 x 7) = 40 electrons</span><br style="background-color: white; font-family: 'Times New Roman'; text-align: -webkit-left;" /><span style="background-color: white; font-family: 'Times New Roman'; text-align: -webkit-left;">(5 single bonds = 10 electrons; 3 lone pairs on each Cl atom = 30 electrons, hence AX</span><sub style="background-color: white; font-family: 'Times New Roman'; text-align: -webkit-left;">5</sub><span style="background-color: white; font-family: 'Times New Roman'; text-align: -webkit-left;"> (trigonal pyramidal))</span> </span></div>mimhttp://www.blogger.com/profile/00658758413634852092noreply@blogger.com0tag:blogger.com,1999:blog-7719212717011454179.post-19929458938099039622012-02-06T05:50:00.000-08:002012-02-06T05:50:52.761-08:00Bonding : VSPER Theory<div><span style="font-size: large;"><b>VSPER THEORY</b></span></div><div><br />
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</div><ul><li>Valence Shell Electron Pair Repulsion theory (VSEPR) is a set of rules whereby the chemist may predict the<b> shape of an isolated molecule.</b> </li>
</ul><ul><li>It is based on the premise that groups of electrons surrounding a central atom repel each other, and that to minimize the overall energy of the molecule, these groups of electrons try to get as far apart as possible. </li>
</ul><ul><li>Groups of electrons can refer to electrons that participate in a bond (single, double, or triple) to another atom, or to non-bonding electrons (e.g. lone pair electrons).</li>
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</div><ul><li>Since the molecular geometry is determined by <b>how many bonding</b> and <b>non-bonding electron groups</b> surround the central atom, the first thing one needs to do is <b>count </b>how many of each there are. </li>
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</div><div style="text-align: center;"><b>Summary VSPER table</b></div><br />
<div class="separator" style="clear: both; text-align: center;"><a href="http://3.bp.blogspot.com/-B-V4hBIuAIE/Ty_YzJWpdnI/AAAAAAAAAB8/6pLkTiq-qdw/s1600/Arrangements.gif" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="640" src="http://3.bp.blogspot.com/-B-V4hBIuAIE/Ty_YzJWpdnI/AAAAAAAAAB8/6pLkTiq-qdw/s640/Arrangements.gif" width="619" /></a></div><br />
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<div class="separator" style="clear: both; text-align: center;"><a href="http://1.bp.blogspot.com/-m9VzxBAKM8Q/Ty_ZRSK-0TI/AAAAAAAAACE/JzJTBP2BJfc/s1600/VSEPR_diagram.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="640" src="http://1.bp.blogspot.com/-m9VzxBAKM8Q/Ty_ZRSK-0TI/AAAAAAAAACE/JzJTBP2BJfc/s640/VSEPR_diagram.png" width="553" /></a></div><sub><b>keyword :</b></sub><br />
<sub><b>A </b>: Central Atom.</sub><br />
<sub><b>X </b>: Electron Domain.</sub><br />
<sub><b>E </b>: Lone Pairs</sub><br />
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</sub></div><div style="text-align: center;"><div class="separator" style="clear: both; text-align: center;"><b><span style="color: red;">MUST SEE VIDEO :</span></b></div><div class="separator" style="clear: both; text-align: center;">This video might help you to understand VSPER theory better.</div><div class="separator" style="clear: both; text-align: center;"><br />
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Other VIDEO :<br />
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<span style="background-color: #ebebeb; color: #333333; font-family: arial, sans-serif; font-size: 13px; line-height: 18px; text-align: left;">Some basic information on VSEPR theory and the geometry formed by electron pairs around a central atom. Discussed in this video are linear, trigonal planar, and tetrahedral arrangements.</span> <br />
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</span></span></div><div style="text-align: left;"><span style="color: #333333; font-family: arial, sans-serif; font-size: x-small;"><span style="line-height: 18px;">Joke of the day :</span></span></div><div style="text-align: left;"><span style="color: #333333; font-family: arial, sans-serif; font-size: x-small;"><span style="line-height: 18px;"><br />
</span></span></div><div class="separator" style="clear: both; text-align: center;"><a href="http://4.bp.blogspot.com/--bYZ24EyDnE/Ty_YI90WzZI/AAAAAAAAABk/ZVrdGD7E6jY/s1600/images+(3).jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="400" src="http://4.bp.blogspot.com/--bYZ24EyDnE/Ty_YI90WzZI/AAAAAAAAABk/ZVrdGD7E6jY/s400/images+(3).jpg" width="282" /></a></div><div style="text-align: left;"><span style="color: #333333; font-family: arial, sans-serif; font-size: x-small;"><span style="line-height: 18px;"><br />
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