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Generally speaking, boiling points increase as carbon chain length increases. This is because there are more atoms present in the hydrocarbon molecule and therefore more intermolecular forces (eg Van der Waals') that must be overcome. In addition the now heavier molecule requires greater energy (heat) to make the phase change to a gas. However, branching decreases boiling point; branched hydrocarbons cannot pack together as closely as unbranched ones, and so intermolecular forces are less strong. So, for example, the bp is higher for butane than 2-methylpropane (even though they contain the same number of C and H atoms).

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7y ago
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11y ago

- A longer hydrocarbon chain means that there are more bonds to break, so more energy is needed in order for the boiling point to be reached. A shorter hydrocarbon chain is more flammable as it takes less energy to break the bonds between atoms.

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11y ago

Yes it does, as the carbon chain length INCREASES, its flammability DECREASES. This is because as the carbon chain length increases, the state changes from gas to liquid to solid.

We can also use the fractional distillation of crude oil as an example. Bitumen has a carbon chain length of approximately 35 or more. Bitumen is used to make roads, it can not be ignited easily otherwise all our roads will be on fire. Next, Gasoline has a carbon chain length of approximately 5 to 12. Gasoline one of the most commonly known flammable liquid. It ignites at around 232 degrees centigrade or 495 degree fahrenheit.

I hope it is useful.

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11y ago

A longer hydrocarbon chain means that there are more bonds to break, so more energy is needed in order for the boiling point to be reached. A shorter hydrocarbon chain is more flammable as it takes less energy to break the bonds between atoms.

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14y ago

The longer the chain the higher the boiling point.
The higher the viscosity the longer the chain.
the shorter the chain the easier it burns.

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11y ago

the longer it is the more lumpy it becomes

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11y ago

Longer carbon chain = higher boiling point.

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Q: How does the boiling point of a hydrocarbon change as its carbon chain length increases?
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