Energy in the Community

What type of graph is shown below

What amount of energy (kJ) is saved when an aluminium can is recycled rather than being made from scratch?

There are 375 mL of drink in most cans. If you were having a get-together with five other friends, which would be more energy efficient-to buy each person their own can of drink or to buy the drink in plastic bottles? Which size bottle would be most energy efficient? Show calculations in support of your answers.

Look at the following grocery list. What is the total energy cost to produce these goods?

• a six-pack of diet drinks (375 mL cans)

• two 2-litre containers of milk

• 5 cans of baked beans

• 1 jar of peanut butter

• I litre of oil (glass bottle)

Mathematical Equivalence

ON

Only a few items have been listed on the graph. What other items are used in the packaging of your family's weekly groceries? Can you think of any ways in which you and your family might reduce the amount of disposable rubbish that you have each week?