A factory makes a polymer from an alkene monomer by addition polymerisation. The table shows the quality-control results for a complete reaction.
| Measurement | Before the reaction | After the reaction |
|---|---|---|
| Mass of monomer or polymer in the reaction vessel | 120.0 kg | 120.0 kg |
| Carbon–carbon double bonds detected | Yes | No |
Explain both of the quality-control results.