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Worksheets

Focus on Organic

Total questions: 74

Worksheet time: 3625secs

Name
Class
Date
1.

What is the name of the alkane with two carbon atoms?

a)

Ethane

b)

Methane

c)

Butane

d)

Propane

2.

What chemicals are found in crude oil?

a)

Methane only

b)

A mixture of compounds, which are mostly hydrocarbons

c)

A mixture of elements

d)

Carbon only

3.

What is the definition of a hydrocarbon?

a)

A compound made of hydrogen and carbon only

b)

A compound that includes hydrogen or carbon

c)

A mixture that includes hydrogen and carbon

d)

A mixture of hydrogen and carbon only

4.

What is the first stage in the fractional distillation of crude oil?

a)

Heating, to vaporise the hydrocarbons

b)

Heating, to make it a hot liquid

c)

Cooling it

d)

Separating the fractions

5.

What happens to the viscosity of hydrocarbons as the length of the molecule increases?

a)

Longer hydrocarbons are more viscous

b)

All hydrocarbons have the same viscosity

c)

Hydrocarbons aren’t viscous

d)

Shorter hydrocarbons are more viscous

6.

What compounds are produced in the complete combustion of hydrocarbons?

a)

Carbon dioxide and water

b)

Carbon monoxide and water

c)

Carbon dioxide and nitrogen

d)

Water and nitrogen

7.

The alkanes are a homologous series.

What is the general formula of the alkanes?

a)

n carbon atoms, 2n hydrogen atoms

b)

2n carbon atoms, n hydrogen atoms

c)

n carbon atoms, n+2 hydrogen atoms

d)

n carbon atoms, 2n+2 hydrogen atoms

8.

What property allows us to separate hydrocarbons during fractional distillation?

a)

Different hydrocarbons have different boiling points

b)

Different hydrocarbons have different melting points

c)

Different hydrocarbons are different colours

d)

Some hydrocarbons have a positive charge and others have a negative charge

9.

Which is the best description of fractional distillation?

a)

Breaking down longer hydrocarbon chains into smaller ones that are more useful

b)

Separating the hydrocarbons in crude oil into fractions, with each fraction containing molecules with a similar number of carbon atoms

c)

Pumping crude oil out from under the sea

d)

Ensuring resources are used to meet the needs of current generations without compromising the needs of future generations

10.

Crude oil is finite because we use it before more can be formed.

How was crude oil formed?

a)

From the remains of an ancient biomass, consisting mainly of plankton, that was buried in mud

b)

Mostly from the remains of dinosaur bones

c)

By fractional distillation

d)

By cracking

11.

Why, in terms of column temperature, do the fractions condense at different levels in the fractionating column?

a)

The column is hotter at the bottom and cooler at the top

b)

The column is cooler at the bottom and hotter at the top

c)

All the column is at the same temperature

d)

The column has a hotter section halfway up

12.

What happens to the boiling point and flammability of hydrocarbons as the length of the molecules increases?

a)

Longer hydrocarbons have lower boiling points and are less flammable

b)

Longer hydrocarbons have higher boiling points and are more flammable

c)

Longer hydrocarbons have lower boiling points and are more flammable

d)

Longer hydrocarbons have higher boiling points and are less flammable

13.

Hydrocarbons with shorter carbon chains are more flammable.

What does this make them useful for?

a)

Lubricants

b)

Fuels

c)

Plastics

d)

Feedstock

14.

How many carbon atoms and hydrogen atoms are there in propane?

a)

2 carbon atoms, 6 hydrogen atoms

b)

4 carbon atoms, 8 hydrogen atoms

c)

3 carbon atoms, 8 hydrogen atoms

d)

3 carbon atoms, 6 hydrogen atoms

15.

Put the two processes used in fractional distillation in the correct order.

a)

Evaporating and then melting

b)

Evaporating and then condensing

c)

Condensing and then evaporating

d)

Melting and then condensing

16.

Which substances can be produced from crude oil?

a)

Metal alloys and glass

b)

Glass and concrete

c)

Limestone and steel

d)

Kerosene and polymers

17.

What happens to carbon and hydrogen during combustion reactions?

a)

They are reduced

b)

They are oxidised

c)

They are cracked

d)

They are distilled

18.

Crude oil is ​ (a)   , meaning it will eventually run out. It is a ​ (b)   of hydrocarbon molecules, formed from the ​ (c)   of ancient organisms buried under mud.

Choose from the below words
finite
mixture
biomass
infinite
shells
formulation
19.

Identify the Alkanes

a)

Butane

b)

c)

Propene

d)

e)

20.

The general formula for an alkane is:

C​nH ​ (a)  

Choose from the below words
2n+2
2n
2n+1
n+2
21.

Complete the Alkane formula:

C6H (a)  

22.

Match the following

a)

C7H__

1.

16

b)

C3H8

2.

Propane

c)

C8H__

3.

18

d)

C_H20

4.

9

e)

C_H10

5.

4

23.

Reorder the following

a)

Methane

b)

c)

C3H8

d)

Butane

e)

1)
2)
3)
4)
5)
24.

Where are the smallest hydrocarbons collected?

A
B
C
D
E
F
G
25.

Reorder the following

a)

Crude oil is vaporised

1.

Before entering the column

b)

The column is hottest at the bottom

2.

Larger molecules condense lower down

c)

Small hydrocarbons have a very low boiling point

3.

Collected at the top of the column

d)

The length of the hydrocarbon affects its boiling point

4.

Boiling points separate hydrocarbons

26.

Match the statements

a)

Hydrocarbon series with no double bonds

1.

Alkanes

b)

Hydrocarbon series with double bonds

2.

Alkenes

c)

A method of separating hydrocarbons

3.

Fractional Distillation

d)

A method of splitting larger hydrocarbons into smaller ones

4.

Cracking

e)

Turns from orange to clear with alkenes

5.

Bromine Water

27.

Match the following

a)

Small hydrocarbons can be used as fuel and feedstock

1.

Why is cracking carried out

b)

More viscous

2.

Large hydrocarbons

c)

More flammable

3.

Small hydrocarbons

d)

Complete combustion

4.

Oxygen is not limited

e)

In-complete combustion

5.

Produces Carbon Monoxide

28.

Categorise these hydrocarbons based on if they will de-colour bromine water

Categorize the following

Ethene

C3H6

CH4

Ethane

Yes
No
29.

Cracking splits ​ (a)   hydrocarbons into ​ (b)   hydrocarbons. This can be done using a ​ (c)   or steam . There will only be one ​ (d)   produced and one or more ​ (e)  

Choose from the below words
large
smaller
catalyst
alkane
alkenes
small
larger
30.

C102H206 --> C50H102 + ​ C (a)   H104

31.

name the group that has a single bond

a)

alkenes

b)

alcohols

c)

alkanes

d)

ethers

32.

the name of this compaund C4H10

a)

METHANE

b)

HEXENE

c)

BUTANOIC ACID

d)

BUTANE

33.

which compound is made up of carbons and hydrogen

a)

hydrocarbons

b)

aldehytes

c)

condensed structure

d)

alcohols

34.
Classify the compound based on the functional group present.
a)
alkane
b)
alkene
c)
alkyne
d)
aromatic
35.

Classify the compound based on the functional group present.

a)

alkane

b)

alkene

c)

alkyne

d)

aromatic

36.

Which homolgous series contains a C=C double bond?

a)

alkanes

b)

alkenes

c)

alcohols

d)

carboxylic acids

37.

Which homolgous series contains only C-C single bonds?

a)

alkanes

b)

alkenes

c)

alcohols

d)

carboxylic acids

38.

What is fractional distillation?

a)

a process used to separate crude oil

b)

a process used to burn up fuels

c)

a way to make different products

d)

how oil is extracted from the ground

39.

Which of these substances is not a hydrocarbon?

a)

methane

b)

ethane

c)

propane

d)

butane

e)

ammonia

40.

Fractional distillation separates crude oil based on the different __________ of the molecules in the mixture

a)

melting point

b)

boiling point

c)

freezing point

d)

chemical reactivity

41.

A fraction of crude oil is made up of:

a)

Hydrocarbons of similar chain lengths

b)

Numbers

c)

Large hydrocarbons

d)

Alkenes only

42.

Crude oil is made up of:

a)

Ethane

b)

Butane

c)

A mixture of different hydrocarbons

d)

Extremely large hydrocarbons which are broken up once extracted

43.

What process happens at each level in the fractionating column?

a)

Evaporation

b)

Condensation

c)

Combustion

44.

What process happens as the crude oil enters the fractionating column?

a)

Evaporation

b)

Condensation

c)

Combustion

45.

Where do short chain hydrocarbons collect?

a)

At the top

b)

In the middle

c)

At the bottom

46.

Where do long chain hydrocarbons collect?

a)

At the top

b)

In the middle

c)

At the bottom

47.

Shorter hydrocarbons have:

a)

Higher boiling points

b)

Lower boiling points

48.
Petroleum and natural gas form from...
a)
strong winds
b)
cooled magma
c)
radioactive materials
d)
remains of plants and animals 
49.
How many carbon atoms are in propane
a)
1
b)
2
c)
3
d)
4
50.
If an alkane has 20 carbon atoms, how many hydrogen atoms will it have?
a)
20
b)
22
c)
40
d)
42
51.
Name this alkane
a)
Methane
b)
Ethane
c)
Propane
d)
Butane
52.
Name this alkane
a)
Methane
b)
Ethane
c)
Propane
d)
Butane
53.
The "ane" ending in "alkane" tells someone that they are dealing with _________-bonded carbons.
a)
single
b)
double
c)
triple
d)
quadruple
54.
General formula of Alkane is 
a)
CnH2n+2
b)
CnH2n
c)
CnH2n+1OH
d)
CnH2n+1COOH
55.
Hydrocarbons are compounds that contain
a)
Carbon, only
b)
Carbon and Hydrogen, only
c)
Carbon, Oxygen, and Hydrogen, only
d)
Carbon, Oxygen, Hydrogen, and Nitrogen, only
56.

Hydrocarbons burning is an example of what type of chemical reaction ?

a)

neutralisation

b)

endothermic

c)

addition

d)

exothermic

57.

A saturated hydrocarbon is an ... ?

a)

Alkane

b)

Alkene

58.
Classify the compound based on the functional group present.
a)
alkane
b)
alkene
c)
alkyne
d)
aromatic
59.

Which homolgous series contains a C=C double bond?

a)

alkanes

b)

alkenes

c)

alcohols

d)

carboxylic acids

60.

Shorter hydrocarbons have:

a)

Higher boiling points

b)

Lower boiling points

61.

What is the general formula for alcohols?

a)

CnH2n+1OH

b)

CnH2nOH

c)

CnH2n+2OH

d)

CnH2n+1O

62.

What gas is produced when sodium reacts with ethanol?

a)

hydrogen

b)

carbon dioxide

c)

oxygen

d)

chlorine

63.

What gas is produced when potassium carbonate reacts with ethanoic acid?

a)

hydrogen

b)

carbon dioxide

c)

oxygen

d)

chlorine

64.

Carboxylic acids are produced by the oxidation of....

a)

Alcohols

b)

Alkenes

c)

Alkanes

d)

Ketones

65.

A hydrocarbon is...

a)

only found in oil

b)

a molecule containing the atoms carbon and hydrogen

c)

flammable

d)

contains only carbon and hydrogen

66.

Alkanes are

a)

saturated

b)

have the general formula CnH2n+2

c)

A homologous series

d)

all of the above

67.

Which statement is true about Alkanes?

a)

related to cycloalkanes

b)

flammable

c)

All end in -ane

d)

Only used to power cars

68.

identify the following molecule

a)

septane

b)

octane

c)

heptane

d)

methylhexane

69.

Carbon can form 4 covalent bonds because

a)

It has 6 electrons

b)

It is in group 4

c)

it loses 4 electrons

d)

when a pair of electrons is shared between to atoms

70.

A homologous series is a family of molecules which

a)

have the same general formula

b)

the same physical properties

c)

the same chemical properties

d)

all of the above

71.

which statement is untrue

a)

Alkanes have the same chemical properties and trend in physical properties

b)

The cycloalkanes are a homologous series

c)

In fractional distillation the boiling point of fractions increases up the column

d)

In fractional distillation the viscosity increases down the column

72.

when burnt hydrocarbons can produce

a)

carbon dioxide

b)

carbon monoxide

c)

carbon

d)

water

e)

all of the above

73.

which statement is untrue

a)

alkenes are found in crude oil

b)

alkanes can be made by cracking

c)

alkenes can be made by cracking

d)

alkenes are unsaturated

74.

Which one is the odd one out

a)

A

b)

B

c)

C

d)

D

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