Worksheet: Below is a radical reaction and table of data, explain the trend usin
ID: 532923 • Letter: W
Question
Worksheet:
Below is a radical reaction and table of data, explain the trend using terminology learned in class.
When are initiation, propagation and termination all occurring?
Report Sheet
Time
pH
Reaction changes
Before reaction
6
Clear
After 1 minute
5
Cloudy
After 2 minutes
4
After 3 minutes
3
After 4 minutes
2
After 5 minutes
2
After 6 minutes
2
Time
pH
Reaction changes
Before reaction
6
Clear
After 1 minute
5
Cloudy
After 2 minutes
4
After 3 minutes
3
After 4 minutes
2
After 5 minutes
2
After 6 minutes
2
2,2,4-Trimethylpen Lane Cl Cl 2,2,4-Trimethylpen LaneExplanation / Answer
The formation of the chloroalkane causes the solution to develop a cloudy appearance. The solution finally becomes opaque after the reaction has completed. Therefore the trend in colour is a gradual change from a clear solution to an opaque solution.
Initiation occurs when the solution is clear. Once the product starts being formed, the solution becomes cloudy. This cloudy appearance indicates propogation of the reaction. The termination step takes place once the solution has become opaque and the solution pH becomes constant.
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