| These are the pieces used to assemble the molecular models of ethyne. On the left are 2 hydrogens, two linear carbon atoms, four pieces of black tubing for creating the triple bond,
and the fastener used to create a single bond. On the right are 2 hydrogen atoms, 2 linear carbon atoms, four pieces of white tubing for the triple bond, one short green tube for the triple bond, and 2 longer green tubes
used to create single bonds.
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| In forming the triple bond in the left image the fastener is used to first link the two carbon atoms together and then the tubes
are used to complete the triple bond by sliding the tubing over the perpendicular posts of each carbon atom. The triple bond in the image on the right
is created in a similar manner by first using the short green tube to link the two carbon atoms and then the tubing to complete the triple bond.
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| In the completed molecule it is evident that there is no rotation for the carbon-carbon triple bond. The molecular shape around each carbon atom
is linear and the electron pair geometry around each carbon atom is linear.
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| The four arrows shown in each image indicate how the Octet Rule is fulfilled for one carbon atom. Note that there
are a total of 6 electrons shared between the two carbon atoms.
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| Structural formula of ethyne. Remember that each dash represents a pair of electrons (two electrons).
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| Animated molecular model of ethyne.
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