Chemistry Multiple Choice

Chemistry Multiple Choice-24
Before we look at our answer choices, let's think really fast about what it means to have a higher or lower boiling point.The boiling point tells us how much energy we have to add to break the intermolecular bonds between all of our molecules.Even though our TFP has more polar C-F bonds, it actually has a lower boiling point, so this observation, which is true, still doesn't explain what we're trying to explain.

Before we look at our answer choices, let's think really fast about what it means to have a higher or lower boiling point.The boiling point tells us how much energy we have to add to break the intermolecular bonds between all of our molecules.Even though our TFP has more polar C-F bonds, it actually has a lower boiling point, so this observation, which is true, still doesn't explain what we're trying to explain.

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We have nine carbons versus one, two, three, four, five carbons. We know that even though the molar mass here is the same, the length of the chain is actually related to the London dispersion forces.

So as the length of the chain goes up, that actually means that the London dispersion forces, so the intermolecular forces that happen when you get these tiny instantaneous dipoles, those forces also go up.

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So, we're saying, okay, this has a longer chain.

Therefore, it will have more London dispersion forces because these molecules are better able to interact with each other with their instantaneous dipoles, and that means these forces go up and the boiling point should go up, and that's what we're trying to explain.

So, answer choice A says, the carbon-fluorine bond is easier to break than the carbon-hydrogen bond.

And we know this is a wrong answer, because this has nothing to do with intermolecular forces.

So if we just look at the pictures here of the structures, this is also true.

In nonane we have these one, two, three, four, five, six, seven, eight, nine carbons.

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