I used this document in my GCSE revision and it helped me to achieve a Grade 8 in my final chemistry GCSE exam (edexcel igcse board). These notes are made based on the CGP GCSE guide.
cracking : breakdown of large alcanes into smaller more useful accane and
alkenes using heat
THERMAL DECOMPOSITION
NNN H
4 M H M HH H I 111
HH
1 -H
H c c C C C C C C H he at c C H C
H c C H c C C
- - -
+
- - - - - -
=
>
- - - - - - - -
-
it isa isi itw i it iti is i ww H
CHiz CH ,o 24Hz
alkane alkene
formula for formula for
Alkames Alkenes saturated unsaturated
In Han + 2 CnHzn
at least one
double bond between
the carbon atoms
saturated hydrocarbons make the maximum number of
bonds and contains single bonds only
ALKENES
carbon display molecular molecular Name
number structure Structure formula
1
Hy ~
H
CH2CH2 etheme
C2Ha
2 /
C
=
H H
H H
-
H
3 H -
-
= c CHzCHCHz C3Hy propene
H
H HH
1 1 1 H
CHzCHeCHCH2 CHz butene
& H -
c -
C -
C = C
it i H
H HH H H
c
11 I
3 H -
c -
c -
c -
c = CH3CHzCHzCHCH2 CsHio pentene
Hi H H
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