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Chemistry
10th -
11thgrade
Fractional Distillation & Cracking Process
25 questions
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- 1. Multiple Choice
Fractional distillation separates crude oil based on the different __________ of the molecules in the mixture
melting point
boiling point
freezing point
chemical reactivity
- 2. Multiple Choice
Molecules collected at the bottom of the fractionating column tend to be...
more viscous, less flammable and less volatile
less viscous, more flammable and more volatile
more viscous, more flammable and less volatile
less viscous, less flammable and more volatile
- 3. Multiple Choice
Molecules collected at the top of the fractionating column tend to be...
more viscous, less flammable and less volatile
less viscous, more flammable and more volatile
more viscous, more flammable and less volatile
less viscous, less flammable and more volatile
- 4. Multiple Choice
Name the following hydrocarbon
butane
hexane
heptane
hexene
- 5. Multiple Choice
When testing for alkenes (unsaturation) bromine water turns from...
orange --> blue/black
colourless --> pink
orange --> colourless
orange --> clear
- 6. Multiple ChoiceWhich key term is described as the attractive force BETWEEN molecules?a) Inner molecular forcesb) Outer molecular forcesc) Intermolecular forcesd) Intramolecular forces
- 7. Multiple Choice
Alkenes have the general formula:
CnH2n
CnH2n+1
CnH2n+2
CnHn
- 8. Multiple Choice
What term describes alkene molecules that contain a C=C double bond?
saturated
unsaturated
- 9. Multiple Choice
Alkanes have the general formula:
CnH2n
CnH2n+1
CnH2n+2
CnHn
- 10. Multiple Choice
Where in the fractionating column are shorter chain hydrocarbon molecules obtained?
At the top
At the bottom
- 11. Multiple Choice
What are the 2 products of complete combustion?
carbon dioxide + hydrogen
carbon dioxide + water
carbon monoxide + water
carbon monoxide + hydrogen
- 12. Multiple Choice
What are the products of incomplete combustion?
carbon monoxide
water
carbon
hydrogen
- 13. Multiple Choice
Which of these isn't a fraction produce through fractional distillation?
Bitumen
Naptha
Fuel oil
Ethanol
- 14. Multiple Choice
What is crude oil formed from?
Remains of shale gas trapped under the sea bed
Remains of gases trapped in the ozone layer
Remains of plants and animals that died millions of years ago
Remains of animal faeces from millions of years ago
- 15. Multiple Choice
Which bond breaks during cracking?
C-C bond
C-C double bond
C-H bond
C-OH bond
- 16. Multiple Choice
What is cracking?
Process of breaking long chain alkenes into shorter chain alkanes, alkenes and hydrogen
Process of breaking long chain alkanes into shorter chain alkanes, alkenes and hydrogen
Process of separating long chain alkanes into shorter chain alkanes, alkenes and hydrogen
Process of breaking long chain haloalkanes into shorter chain haloalkenes
- 17. Multiple Choice
Which of these is not a condition of catalytic cracking?
Slight pressure
Rhodium catalyst
Zeolite catalyst
High temperature
- 18. Multiple Choice
Which form of cracking produces the highest percentage of alkenes?
Catalytic
Steam
Fractional
Thermal
- 19. Multiple Choice
Which of these statements are incorrect about thermal cracking?
Low pressure
Produces high percentage of arenes
Produces high percentage of alkenes
High temperature
- 20. Multiple Choice
Which of these fractions are most in demand?
LPG
Bitumen
Petrol
Gas oil
- 21. Multiple Choice
Which is NOT a property of a long chain hydrocarbon?
Viscous
Flammable
Not very volatile
High boiling point
- 22. Multiple Choice
Which of these substances is not a hydrocarbon?
methane
ethane
propane
butane
ammonia
- 23. Multiple Choice
Crude oil is made up of:
Ethane
Butane
A mixture of different hydrocarbons
Extremely large hydrocarbons which are broken up once extracted
- 24. Multiple Choice
What process happens at each level in the fractionating column?
Evaporation
Condensation
Combustion
- 25. Fill in the Blank
Cracking is a process used to break up hydrocarbon chains because the products are more ................ than the reactants.
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