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Problem

Use the Molecule Shape simulator (http://openstax…
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Problem 115 Easy Difficulty

Use the Molecule Shape simulator (http://openstaxcollege.org/l/16MolecShape) to explore real
molecules. On the Real Molecules tab, select H2O. Switch between the “real” and “model” modes. Explain the difference observed.

Answer

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Chemistry 101
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Chapter 7

Chemical Bonding and Molecular Geometry

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Video Transcript

hi. In this problem, we are using this simulator and we are building a water molecule. Actually, they've built it already for us. But we have this water molecule where we have the oxygen and the two hydrogen. And then there are the two lone pairs. So as we look at this, it's electron pair. Geometry is a tetra hydro. The Tetra hydro geometry has four electron areas coming off of that central atom. So in the model, those bond angles are going to be identical. So when the model we see 109.5 degrees as the bond angle between any of these okay, however, as we switched to the rial molecule itself looks very similar. It's just that Then we see that the lone pairs start to repel a little bit more. So since they repel a little bit more, the bond angle between the two hydrogen is reduced, its pushed a little bit closer together and is reduced toe one of 4.5 degrees. So that is the Onley Reald difference we see here is that the model show see ideal ized 109.5 degrees that you would see in a Tetra Hydro. All whereas the rial model shows the effect of the lone pairs. Pushing the hydrogen is a little bit closer together and reducing that bond angle toe one of 4.5.

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