Podcast
Questions and Answers
What is the main principle behind fractional distillation of oil?
What is the main principle behind fractional distillation of oil?
- Color of molecules
- Size of molecules (correct)
- Density of molecules
- Shape of molecules
Why do smaller molecules in fractional distillation of oil condense at the top at lower temperatures?
Why do smaller molecules in fractional distillation of oil condense at the top at lower temperatures?
- They are lighter in weight (correct)
- They have larger van der Waals forces
- They are denser
- They have stronger van der Waals forces
What is the purpose of vacuum distillation in separating heavy residues from crude oil fractions?
What is the purpose of vacuum distillation in separating heavy residues from crude oil fractions?
- To increase the pressure over heavy residues
- To change the color of heavy residues
- To decrease the boiling point of heavy residues (correct)
- To increase the boiling point of heavy residues
In fractional distillation in the laboratory, why is the most volatile substance collected at the top of the fractionating column?
In fractional distillation in the laboratory, why is the most volatile substance collected at the top of the fractionating column?
What happens to vapors with higher boiling points in fractional distillation in the laboratory?
What happens to vapors with higher boiling points in fractional distillation in the laboratory?
How does lowering the pressure over a liquid affect its boiling point?
How does lowering the pressure over a liquid affect its boiling point?
What is the purpose of fractional distillation in the context of separating liquids?
What is the purpose of fractional distillation in the context of separating liquids?
What is the primary economic reason for the process of cracking larger hydrocarbons into smaller molecules?
What is the primary economic reason for the process of cracking larger hydrocarbons into smaller molecules?
Which type of cracking produces mostly alkenes like ethene used in the production of polymers?
Which type of cracking produces mostly alkenes like ethene used in the production of polymers?
What are the conditions required for catalytic cracking to occur?
What are the conditions required for catalytic cracking to occur?
In the context of combustion, what happens to alkanes when there is incomplete combustion?
In the context of combustion, what happens to alkanes when there is incomplete combustion?
What are the products of complete combustion of alkanes in the presence of excess oxygen?
What are the products of complete combustion of alkanes in the presence of excess oxygen?
