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Counting Chains in a Model Polymer Batch 4 questions
Counting Chains in a Model Polymer Batch
Base your answers on the information provided and your knowledge of chemistry. Use the 2025 Chemistry Reference Tables as needed.
A class models an addition polymer. Joining two monomers into a chain keeps all atoms of both monomers in that chain. The model makes no small-molecule byproduct. Two batches start with 800 identical monomer units each.
| Batch | Chains shown after reaction | Monomer units in each shown chain |
|---|---|---|
| A | 8 | 100 |
| B | 4 | 200 |
Question 1
Calculate the number of monomer units in the shown chains for each batch.
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Question 2
Which comparison follows from the model?
- A has more polymer mass because it contains more chains.
- B has more polymer mass because each chain is longer.
- Both have the same polymer mass because they contain the same number of identical units.
- Both have zero polymer mass because no byproduct formed.
A third batch also starts with 800 units. A record shows six chains of 100 units each and reports that some monomer remains unjoined.
Question 3
Calculate how many unjoined units remain in the third batch under the model.
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Question 4
A student compares only the mass of separated polymer and concludes that matter disappeared in the third batch. Explain what measurement is missing.
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