Fractional Distillation of Alkanes

This video tutorial explains the separation of alkanes by fractional distillation. It begins with an introduction to alkanes, their uses, and their presence in crude oil. The process of fractional distillation is then detailed, including the importance of boiling points and condensation. The video concludes with a step-by-step explanation of the stages involved in fractional distillation, highlighting how different alkanes are collected based on their boiling points.

What is the general formula for alkanes?

• CnH2n

• CnH2n-2

• CnH2n+1

• CnH2n+2

Why is crude oil considered a non-renewable resource?

• It is formed from renewable resources.

• It is made from synthetic materials.

• It is used faster than it can be naturally replenished.

• It is abundant and easily accessible.

What type of intermolecular forces are present in alkanes?

• Hydrogen bonds

• Dipole-dipole interactions

• London dispersion forces

• Ionic bonds

How does the boiling point of alkanes change with carbon chain length?

• It remains constant regardless of chain length.

• It increases with longer chains.

• It fluctuates randomly.

• It decreases with longer chains.

What happens to an alkane gas when it is cooled below its boiling point?

• It remains a gas.

• It condenses into a liquid.

• It turns into a solid.

• It decomposes.

In fractional distillation, where are alkanes with shorter carbon chains collected?

• Near the top of the column

• In the middle of the column

• At the bottom of the column

• Outside the column

What is the purpose of bubble caps in the fractionating column?

• To prevent vapors from rising

• To allow vapors to pass upwards

• To condense vapors into liquids

• To heat the vapors

What is collected at the bottom of the fractionating column?

• Ethane

• Methane

• Propane

• Bitumen

Why doesn't fractional distillation separate each individual alkane?

• It only works for gases.

• It is not designed for complete separation.

• It separates based on similar boiling points.

• It requires too much energy.

What would be required to separate each individual alkane after fractional distillation?

• Further rounds of fractional distillation

• Cooling the mixture

• Adding more crude oil

• Heating the mixture