Chemistry-Using reasources-life cycle

Why are lifecycle assessments carried out?

Lifecycle assessments are carried out to assess the environmental impact of a product.

Name the four main stages of a life cycle assessment.

The four main stages of a life cycle assessment are: Extraction and processing of raw materials; Manufacturing and packaging; Use of product; Disposal of product

True or False? It is fairly easy to quantify the use of water, resources, energy sources and production of some waste.

True. It is fairly easy to quantify the use of water, resources, energy sources and production of some waste.

True or False? It is easy to allocate a numerical value to the polluting effect of a product when carrying out a LCA.

False. It is not easy to allocate a numerical value to the polluting effect of a product when carrying out a LCA.

True or False? A life cycle assessment is not an objective process.

True. A life cycle assessment is not an objective process.

Why do materials such as glass and metal need to be recycled and reused?

Materials such as glass and metal need to be recycled and reused because they are made from natural but finite sources.

State two advantages of recycling materials.

Advantages of recycling materials includes: Reducing energy use; Conserving raw materials; Reduces the amount of waste sent to landfill

State two disadvantages of recycling metals.

Two disadvantages of recycling metals include: Materials need to be collected and transported which requires energy and fuel; Workers, vehicles and worksites need to be organised and maintained; Materials need to be sorted before they can be recycled; Products made from recycled materials may not always be of the same quality

How does recycling impact the use of fossil fuels?

Recycling reduces the use of fossil fuels.

Describe how a glass bottle can be recycled.

A glass bottle can be recycle by being crushed and melted, and then remoulded into a different shape.

Describe the process of recycling metals.

Metals can be recycled by heating the metal until it melts and recasting them into a new shape.

True or False? It is much more energy efficient to recycle metals than it is to extract them as melting and re-moulding requires less energy.

True. It is much more energy efficient to recycle metals than it is to extract them as melting and re-moulding requires less energy.

Give two factors that determine the amount of separation required for recycling.

Two factors that determine the amount of separation required for recycling are: The material being recycled; The properties required of the final product

True or False? Most of the energy needed to produce raw materials, such as glass, comes from limited resources.

True. Most of the energy needed to produce raw materials, such as glass, comes from limited resources.

True or False? Glass is separated by colour and size before being recycled.

False. Glass is separated by colour and chemical composition before recycling.