Alkenes & Polymers quiz

1.

A student has been asked to draw all the alkene isomers of C₄H₁₀ and draws the following. Which of the following statements about the student's diagram is correct?

The student is wrong. The molecule on the right is just normal butane. Bending the end round doesn't change that.

The student is correct and deserves a tuck-shop voucher.

The student is wrong because she makes no reference to the numbers of protons and neutrons in the molecules.

The student is wrong. There is another isomer called 1,2-dimethylethane.

Question 1 of 29

2. Recall the names of the main fractions obtained from crude oil, in order of lowest boiling point first

Refinery gases, gasoline, diesel, kerosene, fuel oil and bitumen

Refinery gases, gasoline, diesel, naptha, fuel oil and bitumen

Refinery gases, gasoline, kerosene, diesel, fuel oil and bitumen

Refinery gases, gasoline, naptha, diesel, fuel oil and bitumen

Question 2 of 29

3. Would methane normally react with bromine?

Only if the temperature is over 500⁰C

No (because it is saturated)

Yes (to produce bromomethane and hydrogen bromide)

Only if the pressure is greater than 2 atm

Question 3 of 29

4. State the general formula of alkanes

CₙHₙ₊₁

CₙH₂ₙ₊₂

CₙH₂ₙ

C₂ₙH₂ₙ₊₂

Question 4 of 29

5. This diagram shows one repeat unit of a polymer. Name the monomer used to make this polymer.

polychloroethene

polytetrachloroethene

chloroethene

chloroethane

Question 5 of 29

6. What is crude oil?

A mixture of alkanes

A mixture of hydrocarbons

A mixture of alcohols

An oily liquid

Question 6 of 29

7. Explain why carbon monoxide is dangerous to humans

It is poisonous because it reduces the capacity of the blood to carry oxygen

It is poisonous because it blocks blood flow

It is poisonous because it poisons the bloodstream

It is poisonous because it blocks surfaces for gas exchange

Question 7 of 29

8. Explain the term unsaturated

A compound that is a liquid at room temperature

A molecule containing a carbon-carbon double or triple bond

A poisonous molecule

A molecule containing only single bonds

Question 8 of 29

9. When long chain alkanes are cracked, what is produced?

Shorter chain alkenes only

Shorter chain alkanes and alkenes

Shorter chain alkanes only

Shorter chain alkenes and hydrogen

Question 9 of 29

10. What is the name of this molecule?

but-1-ene

prop-1-ene

pent-2-ene

but-2-ene

Question 10 of 29

11. What is the molecular formula for pentane?

C₅H₁₀

C₃H₈

C₅H₁₂

C₂H₆

Question 11 of 29

12. What does the following diagram represent?

The polymer oct-3-ene

ethylbutylethane

One repeat unit of polyoct-2-ene

One repeat unit of polyoct-3-ene

Question 12 of 29

13. Recall the products of the complete combustion of alkanes

Carbon and water

Water and oxygen

Carbon monoxide and water

Carbon dioxide and water

Question 13 of 29

14. State the general formula for alkenes

CₙH₂ₙ

CₙH₂ₙ₊₂

CₙHₙ

CₙHₙ₊₁

Question 14 of 29

15. Explain the term saturated

A molecule containing only single bonds

A molecule that is poisonous

A molecule that is usually a solid at room temperature

A molecule that will not react with anything

Question 15 of 29

16. Name this molecule

prop-1-ene

butane

methyl propane

dimethyl ethane

Question 16 of 29

17. What is the name of the process in which crude oil is separated into its various components?

Simple distillation

Fractional distillation

Filtration

Crystallisation

Question 17 of 29

18. What is meant by the term biodegradable?

Able to be broken down by UV radiation

Persists in the environment

Able to be broken down by microorganisms

Toxic to the environment

Question 18 of 29

19. Explain the term functional group

A functional group is an atom or a group of atoms that determine the physical properties of a compound

A functional group is an atom or a group of atoms that determine the chemical properties of a compound

A functional group is a series of compounds with similar chemical properties, a trend in physical properties and the same general formula

A functional group is a formula to show the relative quantity of different types of atom for a molecules in a homologous series. Eg CₙH₂ₙ₊₂ for alkanes

Question 19 of 29

20. Crude oil contains a surplus of long chain alkanes and there is much higher demand for shorter chain alkanes. What process is used to deal with this imbalance?

Cracking

Decomposition

Electrolysis

Hydrolysis

Question 20 of 29

21. Explain the term hydrocarbon

A hydrocarbon is a molecule that comes from crude oil

A hydrocarbon is a molecule that is in a homologous series

A hydrocarbon is an organic molecule

A hydrocarbon is a molecule containing only hydrogen and carbon

Question 21 of 29

22. Of which homologous series is >C=C< (a carbon-to-carbon double bond) the functional group?

Alcohols

Hydrocarbons

Alkenes

Alkanes

Question 22 of 29

23. What is a general formula?

A series of compounds with similar chemical properties and a trend in physical properties

A formula to determine the exact number of different types of atom in a molecule, e.g. C₂H₄ for ethene

A formula to show the relative quantity of different types of atom for a molecules in a homologous series. Eg CₙH₂ₙ₊₂ for alkanes

A formula to determine the structure of a general series, i.e it shows which isomers are part of the general series and which aren\'t

Question 23 of 29

24. What two things can be added together to produce a dibromoalkane?

An alkene and hydrogen bromide

An alkane and bromine

An alkene and bromine

An alkane, bromine and UV light

Question 24 of 29

25. Bromine is added to a sample of an alkane and also to a sample of an alkene. Describe the result of each.

With the alkane, no change (stays colourless). With the alkene, changes from colourless to orange

With the alkane, no change (stays orange). With the alkene, changes from orange to colourless

With the alkane, changes from colourless to orange. With the alkene, no change (stays colourless)

With the alkane, changes from orange to colourless. With the alkene, no change (stays orange)

Question 25 of 29

26. What is meant by the term viscosity?

The viscosity of a fluid is how easily it evaporates. Refinery gases evaporate easily, they have high viscosities

The viscosity of a fluid describes how easily it flows. Water has a low viscosity, it flows very easily. Crude oil has a higher viscosity than water, it does not flow very easily.

The viscosity of a fluid is how easily it evaporates. Refinery gases evaporate easily, they have low viscosities

The viscosity of a fluid describes how easily it flows. Water has a high viscosity, it flows very easily. Crude oil has a lower viscosity than water, it does not flow very easily.

Question 26 of 29

27. What is an addition reaction?

A reaction where an atom or group of atoms is added to a molecule without taking anything away

A reaction where an atoms of a group of atoms is removed from a molecule

A reaction where a double bond breaks to form a long chain of molecules

A reaction where an atom or group of atoms is replaced by a different atom or group of atoms

Question 27 of 29

28. Explain what a monomer is

Monomers are the many small molecules (such as ethene) which add together to make a polymer

Monomers are the products of cracking long chain alkanes

Monomers are the long chain molecules produced in a polymerisation reaction

Monomers are the small molecules released in a polymerisation reaction

Question 28 of 29

29. What is a substance called if it, when burned, releases heat energy?

A fossil fuel

An electrolyte

A coal

A fuel

Question 29 of 29

Alkenes & Polymers quiz

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