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UCS Remove - Back to School - OChem 1

Total questions: 53

Worksheet time: 31mins

Name
Class
Date
1.

What is this process called?

a)

Distillation

b)

Fractional Distillation

c)

Reverse Distillation

d)

Destructive Distillation

2.

This process is based of the fact that all compounds being separated have

a)

A boiling point

b)

Same boiling points

c)

Different boiling points

d)

No boiling points

3.
How does the temperature change from top to bottom?
a)
Increases
b)
Decreases
c)
It does not change
d)
Cannot be determined
4.
What does the viscosity of a hydrocarbon tell you?
a)
How easily it flows
b)
How easily it sets alight
c)
What its boiling point is
d)
How long the hydrocarbon is
5.
The longer the hydrocarbon, the ________ the flammability?
a)
Lower
b)
Higher
6.
The longer the hydrocarbon, the _________ the viscosity?
a)
Lower
b)
Higher
7.
How many carbon atoms are in methane?
a)
1
b)
2
c)
3
d)
4
8.
If an alkane has 20 carbon atoms, how many hydrogen atoms will it have?
a)
20
b)
22
c)
40
d)
42
9.
Which formula represents a saturated hydrocarbon?
a)
A
b)
B
c)
C
d)
D
10.
Which formula represents an unsaturated hydrocarbon?
a)
A
b)
B
c)
C
d)
D
11.

What chemical is this? (C5H10)

a)

Pentene

b)

Pentane

c)

Hexane

d)

Heptene

12.
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
13.
What liquid detects the presence of an alkene?
a)
Alkene water
b)
Bromine water
c)
Water
d)
Limewater
14.

When testing for alkenes (unsaturation) bromine water turns from...

a)

orange --> blue/black

b)

colourless --> pink

c)

orange --> colourless

d)

orange --> clear

15.

Alkenes have the general formula:

a)

CnH2n

b)

CnH2n+1

c)

CnH2n+2

d)

CnHn

16.

Alkanes have the general formula:

a)

CnH2n

b)

CnH2n+1

c)

CnH2n+2

d)

CnHn

17.
Melting and boiling points of alkanes
a)
increase with the number of carbon atoms in the chain
b)
decrease with the number of carbon atoms in the chain
c)
increase with branching
d)
are determined by the bonding between the carbons and hydrogens
18.

Fill in the blank:

What are the Reactants of the combustion reaction?


_______ + _______ --> CO2 + H2O + Energy

a)

Carbon Dioxide (CO2) + Water (H2O)

b)

Fuel (C2H6) + Oxygen (O2)

c)

Carbon Dioxide (CO2) + Oxygen (O2)

d)

Fuel (C2H6) + Water (H2O)

19.
Name this alkane
a)
Methane
b)
Ethane
c)
Propane
d)
Butane
20.
How many carbon atoms are in propane
a)
1
b)
2
c)
3
d)
4
21.
The "ane" ending in "alkane" tells someone that they are dealing with _________-bonded carbons.
a)
single
b)
double
c)
triple
d)
quadruple
22.
What is the exam definition of saturated?
a)
No single bonds
b)
Contains a double bond
c)
No single bonds, all double bonds
d)

No C=C (double) bonds, all C-C (single) bonds

23.
What is kerosene used for?
a)
Fuel for ships
b)
Fuel for lorries
c)
Fuel for airplanes
d)
Making roads
24.
What is the correct definition for a hydrocarbon?
a)
A compound made of hydrogen and carbon
b)
A mixture made of hydrogen and carbon only
c)
A mixture made of only hydrogen and carbon
d)
A compound made of only hydrogen and carbon
25.

For surfacing roads and roofs

a)

petrol

b)

bitumen

c)

fuel oil

d)

kerosene

26.

Fuel for ships and lorries

a)

kerosene

b)

petrol

c)

bitumen

d)

fuel oil

27.

Oil fraction with the shortest molecules

a)

refinery gases

b)

bitumen

c)

oil fuel

d)

diesel

28.

Oil fraction with the highest boiling point

a)

refinery gases

b)

bitumen

c)

oil fuel

d)

diesel

29.

Oil fraction with the lowest boiling point

a)

refinery gases

b)

bitumen

c)

oil fuel

d)

diesel

30.

You add bromine water to a saturated hydrocarbon. The bromine water:

a)

stays the same (remains orange/brown)

b)

goes colourless

31.

You add bromine water to an unsaturated hydrocarbon. The bromine water:

a)

stays the same (remains orange/brown)

b)

goes colourless

32.

CH4 + 2O2 --> CO2 + 2H2O

a)

complete combustion

b)

incomplete combustion

33.

CH4 + O2 --> CO + 2H2O

a)

complete combustion

b)

incomplete combustion

34.

When plenty of oxygen is available

a)

complete combustion

b)

incomplete combustion

35.

Carbon monoxide is a colourless, odourless toxic gas. It

is poisonous because it reduces the capacity of blood to

transport:

a)

carbon dioxide

b)

nitrogen

c)

oxygen

d)

water vapour

36.
Name this alkane
a)
Methane
b)
Ethane
c)
Propane
d)
Butane
37.

What term describes alkene molecules that contain a C=C double bond?

a)

saturated

b)

unsaturated

38.

Molecules collected at the bottom of the fractionating column tend to be...

a)

more viscous, less flammable and less volatile

b)

less viscous, more flammable and more volatile

c)

more viscous, more flammable and less volatile

d)

less viscous, less flammable and more volatile

39.

What is the molecular formula of the hydrocarbon in the picture?

a)

C4H10

b)

CH3CH2CH2CH3

c)

C4H8

40.

What type of formula is represented in this picture?

a)

molecular formula

b)

displayed formula

c)

structural formula

41.

What is the structural formula of the hydrocarbon in the picture?

a)

C4H10

b)

CH3CH2CH2CH3

c)

C4H8

42.

Which letter would turn bromine water colourless?

a)

A

b)

B

c)

C

d)

D

e)

F

43.

Which letter represents propene?

a)

A

b)

B

c)

C

d)

D

e)

F

44.

Ethene is an unsaturated hydrocarbon. What is the molecular formula of ethene?

a)

CH4

b)

C2H4

c)

C3H6

d)

C4H8

45.

alkene + ? --> alcohol

a)

hydrogen

b)

oxygen

c)

water

d)

carbon dioixde

46.
The molecular formula for Heptane is
a)
C4H10
b)
C8H18
c)
C5H12
d)
C7H16
47.
How many carbon atoms are in propane
a)
1
b)
2
c)
3
d)
4
48.
How many hydrogen atoms are in butane
a)
4
b)
6
c)
8
d)
10
49.
At which pipe: M or N are hydrocarbons with lower boiling points collected?
a)
M
b)
N
50.

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

a)

neutralisation

b)

endothermic

c)

addition

d)

exothermic

51.

C5H12 + Br2 --> C5H11Br + HBr

This reaction is called____________________.

a)

Substitution

b)

Addition

c)

Cracking

d)

Combustion

52.

Give the IUPAC name of this molecular formula C6H14

a)

Hexane

b)

Hexanol

c)

Hexanoic Acid

d)

Hexanal

53.

Carbon has an atomic number of ____, with _____, valence electrons.

a)

16; 4

b)

4; 2

c)

6; 4

d)

12; 2

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