Gradegorilla Chemistry

Chemistry µGCSE:
Crude Oil

10 quick questions - for GCSE and iGCSE

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10 minutes maximum! (can you do it in 5?)

1. Crude oil is a …

A. renewable resource
B. complex organic compound
C. mixture of all organic compounds
D. mixture of hydrocarbons

Crude oil in jar

Glasbruch2007 | CC 3.0

2. Hydrocarbons are molecules containing…….

A. …. carbon, hydrogen and oxygen atoms
B. …..carbon, hydrogen and oxygen atoms only
C. ….. carbon and hydrogen atoms
D. …….carbon and hydrogen atoms only

3. Crude oil is separated using the process of …

A. filtration
B. fractional distillation
C. cracking
D. fermentation

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 (650^oC)	Alumina or silica
B	High (650^oC)	iron
C	Low (100^oC)	Alumina or silica
D	Low (100^oC)	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:

A. C₁₀H₂₂ → C₄H₁₀ + C₂H₄
B. C₁₀H₂₂ → 2C₄H₁₀ + C₂H₄
C. C₁₀H₂₂ → C₄H₁₀ + 2C₂H₄
D. C₁₀H₂₂ → C₄H₁₀ + 3C₂H₄