Q4-6 Crude oil is separated into several fractions. From the list given, select the fraction which is …..
4. ..most flammable?
5. ..used to surface roads?
6. ..used as fuel for cars?
7. As hydrocarbon molecules increase in size the boiling point and viscosity change in the following way:
boiling point
viscosity
A
increases
increases
B
increases
decreases
C
decreases
increases
D
decreases
decreases
Q8-10 refer to the process of catalytic cracking of the long chain fractions from crude oil.
8. In catalytic cracking long chain alkanes are converted into ….
A. … smaller alkanes only
B. … smaller alkenes only
C. … smaller alkanes and alkenes
D. … larger alkanes
9. The conditions for catalytic cracking are …..
Temperature
Catalyst of..
A
High (650oC)
Alumina or silica
B
High (650oC)
iron
C
Low (100oC)
Alumina or silica
D
Low (100oC)
iron
10. The catalytic cracking of decane (C10H22) produces butane (C4H10) and ethene (C2H4) as the only products. The correct equation for this reaction is: