The addition polymer poly(butene) has the displayed structural formula: CH3 CH3 | | C ---- C | | H H Poly(butene) is produced from the monomer butene - AQA - GCSE Chemistry - Question 2 - 2022 - Paper 1

Poly(butene) insulation must be removed from scrap copper wire before recycling to ensure that the recycling process is efficient and effective. This is because the insulation can contaminate the copper and affect its purity, which in turn reduces the quality of the recycled copper.

To recycle scrap copper wire into new copper water pipes, the wire is first collected and cleaned to remove any insulation or other impurities. The cleaned copper is then melted down in a furnace and cast into new forms, such as pipes. This ensures that the recycled material maintains a high quality and can be used effectively in plumbing.

1. Recycling scrap copper reduces the need for mining, which can have significant environmental impacts including habitat destruction and pollution.

2. It also saves energy since the process of recycling copper uses less energy compared to the extraction and processing of copper ore.

Name of solution added: Sodium hydroxide (NaOH)

Result: A blue precipitate of copper(II) hydroxide is formed.

Add barium chloride solution to the copper sulfate solution. If sulfate ions are present, a white precipitate of barium sulfate will form, indicating the presence of sulfate ions.