Level Chemistry Transition Unit Worksheet With Answer Key - Healthcote School Page 15
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1714
Alkanes and formulae
Task 13:
1
a
Compounds of hydrogen and carbon only. (1 mark)
b
Covalent bond. (1 mark)
c
Hydrocarbons containing C–C bonds and C–H bonds only. (1 mark)
d
They only have single carbon to carbon bonds. (1 mark)
2
a
Propane molecules have three carbon atoms and eight hydrogen atoms. (2 marks)
b
The bonds between the atoms. (1 mark)
3
a
One from: they take part in similar chemical reactions; the molecular formula for each
successive member differs by CH
. (1 mark)
2
b
C
H
(1 mark)
n
2n+2
c
C
H
(1 mark)
8
18
d
C
H
(1 mark)
9
20
4
a
Single covalent bonds. (1 mark)
b
C
H
(1 mark)
4
10
c
It shows the bonds present between the atoms in the molecule. (1 mark)
5
a
CH
, C
H
, C
H
(3 marks)
4
2
6
3
8
b
Displayed formulae for the alkanes in part a. ( 3 marks )
6
a
Four carbon atoms, 10 hydrogen atoms. (1 mark)
b
C
H
( 1 mark )
4
10
c
Two from: it follows the general formula for the alkanes, it only has single carbon to carbon
bonds, it is a hydrocarbon. (2 marks)
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