Worksheets21C Organic chemistry
Total questions: 26
Worksheet time: 13mins
Name
Class
Date
1.
Where is crude oil found?
a)
In rocks
b)
In the sea
c)
In plants
2.
What is crude oil originally made from?
a)
Ancient biomass, mainly plankton
b)
Ancient biomass, mainly animals
c)
Ancient biomass, mainly plants
3.
Crude oil is a mixture of?
a)
Hydrocarbons
b)
Alkenes
c)
Alcohols
4.
Hydrocarbons are made up of?
a)
Carbon and Hydrogen
b)
Carbon, Hydrogen and Oxygen
c)
Carbon, Hydrogen and Nitrogen
5.
The general formula CnH2n+2 is for which homologous series?
a)
Alkanes
b)
Alkenes
c)
Alcohols
6.
How many carbons in Methane?
a)
1
b)
2
c)
3
7.
How many carbons in Butane?
a)
2
b)
3
c)
4
8.
Which alkane has the formula C3H8?
a)
3
b)
4
c)
2
9.
The fractions from the distillation of oil are used as?
a)
Fuels and Feedstocks
b)
Fuels only
c)
Feedstocks only
10.
Before the crude oil goes into the column it needs to be?
a)
Vapourised
b)
Condensed
c)
Cooled
11.
The fractions can be separated because?
a)
They condense at different boiling points
b)
They condense at different melting points
c)
They freeze at different melting points
12.
The fractions at the top of the column have?
a)
The fewest carbons
b)
The most carbons
13.
The fractions at the top of the column have?
a)
The lowest bp
b)
The highest bp
14.
The fractions at the bottom of the column are?
a)
The most viscous
b)
The least viscous
15.
The most flammabe fraction is removed at the?
a)
The top
b)
The middle
c)
The bottom
16.
When hydrocarbons are burned they release energy and which two compunds?
a)
Carbon Dioxide and Water
b)
Carbon Dioxide and Methane
c)
Methane and Water
17.
The general formula CnH2n is for which homologous series?
a)
Alkenes
b)
Alkanes
c)
Alcohols
18.
How many carbons in ethene?
a)
2
b)
3
c)
4
19.
How many carbons in propene?
a)
3
b)
2
c)
4
20.
Which alkene has the formula C5H10?
a)
Pentene
b)
Hexene
c)
Butene
21.
Large chain hydrocarbons can be broken into more useful smaller chain hydrocarbons by?
a)
Cracking
b)
Fractional Distillation
c)
Polymerisation
22.
Cracking is what type of reaction?
a)
Thermal Decomposition
b)
Synthesis
c)
Polymerisation
23.
What are the conditions needed for cracking?
a)
High temperature and a catalyst
b)
High temperature and pressure
c)
High pressure and a catalyst
24.
Alkenes are made in cracking, what can we test them with?
a)
Bromine water
b)
Limewater
c)
Lit spill
25.
What is the positive result for an alkene with bromine water?
a)
Orange to colourless
b)
Orange to white
c)
Colourless to orange
26.
Alkenes can be used to make?
a)
Polymers
b)
Fuels
c)
Petrol
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