The amount of energy used in making, using and disposing of a man-made object can be analysed with a life-cycle assessment. Energy can be conserved by recycling objects and materials.
What does a life-cycle assessment measure the effect on?
What is the name given to the substances used to make a product?
Which of these is part of the manufacturing stage of a life-cycle assessment?
Energy needed to run machinery
Mining of raw materials
Scrapping of the finished product
A household wants to get rid of a one-year-old vacuum cleaner, which still works. Which of these disposal methods will have the least impact?
Re-use by new household
Mixed household waste is often sent to a recyling centre. Which of these processes is the most important before recycling the materials?
Sorting of the materials
Washing of the materials
Weighing of the materials
What is the greatest energy input in the recycling of glass bottles?
Breaking them into pieces
What effect does metal recycling have on the availability of ores in the Earth?
It has no effect
It uses ores more quickly
It uses ores less quickly
What is the main disadvantage with recycled paper?
It only comes in one colour
It is expensive
It has limited uses
How can iron food cans be separated from aluminium drinks cans at a recyling plant?
By using a magnet
Picking them out manually
Using their colour
Recycling aluminium saves about 90% of the energy needed to manufacture new aluminium. Why does aluminium need so much energy to be extracted?
Aluminium has a high melting point
The metal is extracted by electrolysis
The ore has to be transported long distances