MARKING GUIDE: Unit 1B1 – Reaction Pathways & Kinetic Energy Distribution

1.  A
2.  C
3.  D
4.  B
5.  C
6.  D
7.  A
8.  C
9.  C
10. B

 

 

 

11.
 D
12.
 13.
 14.
 15.
 16.
 B
 17.
A
 18.
  a)Picture1
i) Activation energy =  70kJ mol-1
Enthalpy change  = +40 kJ mol-1
ii)  Activation energy =  30kJ mol-1
Enthalpy change  = -40 kJ mol-1
  b)  Activation energy would be reduced by use of a catalyst.
 19.
 a)  H+ ion appears on both reactant and product side – i.e. not used up.
 b)
Picture4
20.
 B
21.
D
22.
 B
23.
 A
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