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paper 2
organic chemistry
cracking
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Cards (15)
What is meant by cracking in chemistry?
Breaking down long chain
hydrocarbons
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What are the conditions for catalytic cracking?
High
temperature
and a
catalyst
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What is the general formula for alkanes?
C
n
H
2
n
+
2
C_nH_{2n+2}
C
n
H
2
n
+
2
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Why are long chain hydrocarbons not good fuels?
They are not very
flammable
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What is produced when cracking a long chain alkane?
Shorter
chain
hydrocarbons
and
alkenes
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What is an alkene?
A
hydrocarbon
with a
double bond
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How do alkenes differ from alkanes in terms of reactivity?
Alkenes are
more reactive
than alkanes
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What test is used to identify alkenes?
Using
bromine
water
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What happens to bromine water when it reacts with an alkene?
It turns
colorless
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How do you balance a chemical equation for cracking?
Ensure
carbon
and
hydrogen
atoms are
equal
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In a cracking equation, if the left side has 25 carbon and 52 hydrogen atoms, what must the right side total?
Must also total
25
carbon and
52
hydrogen
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If a cracking reaction has 40 carbon and 82 hydrogen atoms on the left, how many are in the first product?
33
carbon and
68
hydrogen atoms
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What are the two types of cracking methods?
Catalytic
cracking
Uses
high
temperature and a
catalyst
Steam
cracking
Uses
high
temperature and
steam
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What are the uses of alkenes?
Used to make
polymers
Starting material
for other
chemicals
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What is the significance of the double bond in alkenes?
Makes
alkenes more reactive
than
alkanes
Allows for
addition reactions
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