Edexcel A-Level Chemistry AS 5.8 How Chemists Limit the Problems Caused By Polymer Disposal By I Developing Biodegradable Polymers Ii Removing Toxic Waste Questions

State one benefit and limitation for each route, identify acidic or toxic combustion products and connect finely divided calcium hydroxide to neutralisation and surface area.

Exam points

Compare incineration and recycling through landfill volume, energy use and emissions.
Explain calcium hydroxide scrubbing of acidic waste gases from incinerators.
Suggest biodegradable polymers or reuse to reduce persistent polymer waste.

[Maximum number: 2]

This question is about alkenes.

Incinerators used to dispose of polymer waste have a system to remove waste gases.

Suggest why these systems contain solid calcium hydroxide and why it is finely powdered.

An answer that makes reference to the following points:

- solid calcium hydroxide is basic and neutralises/reacts with/absorbs acidic waste gases such as $\ce{HCl}$ , $\ce{SO2}$ , NOx or $\ce{CO2}$

- fine powder has a large surface area, ensuring a fast reaction / increasing the rate of reaction

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Edexcel A-Level Chemistry AS 5.8 How Chemists Limit the Problems Caused By Polymer Disposal By I Developing Biodegradable Polymers Ii Removing Toxic Waste Questions question 1