C2H2 Molecular Geometry / Shape and Bond Angles (see description for note)

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A quick explanation of the molecular geometry of C2H2 including a description of the C2H2 bond angles. Note, the Hydrogen atoms (H) should not have lone pair electrons!

We'll determine the C2H2 molecular geometry with respect to the Carbon on the right (the other Carbon atom will have the same shape since they are symmetrical).

Looking at the C2H2 Lewis structure we can see that there are two atoms attached to the Carbon of interest and that there no lone pair electrons. Based on VSEPR Theory (Valence Shell Electron Pair Repulsion Theory) the electron clouds on the atoms around the C will repel each other. As a result they will be pushed apart giving the molecule a linear molecular geometry or shape.

The C2H2 bond angle will be 180 degrees since it has a linear geometry.

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Drawing/writing done in InkScape. Screen capture done with Camtasia Studio 4.0. Done on a Dell Dimension laptop computer with a Wacom digital tablet (Bamboo).
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NOTE: The H should only have two valence electrons (the two between the H and C)!

wbreslyn
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Duude thanks so much. Srsly I had a chem test and I found this and watched it and this exact question was on the test the next day

komalkhan
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YOU ARE THE BEST! GOT ME THROUGH MY CHEM CLASS ILY!

cassandraalvarez
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you teach wayyyy better than my teacher haha thank you ! :D

lukemervin
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@miruna engi there are two bond pairs not three as the two pairs between the two carbon atoms are one sigma bond and one pi bond and in determining the shape we ignore the pi bond as it doesn't effect the shape of molecule

fayez
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The elections around the hydrogen is wrong

Edit: I saw you addressed it, so no need to respond

Alkimachos
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I got absolutely harassed by my teacher for showing this answer to the class 2/10 he sounded smart but wouldn’t reccomend

ahorton
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I can't see the bond angle, your other videos pop up and block the screen :(

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Isn't it planar triangular since there are 3 bond pairs?

miruengi
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Can someone please help...







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