The Recycling Factory

Dear Mr.Smith,
I found a way to separate all of the materials in the dump truck. To separate the Steel cans from the rest of the materials i would use several powerful magnest hanging above the conveyer belt. Then i would use large tank filled with water to get the milk jugs because waters density is 1 while the Milk jugs density is 0.95 so the milk jugs will float on top of the water. Then i would use the nest to skim the top of the water to get the milk jugs out of the water. Then to get rid of the soda cans i would use the Concentrated sugar water because its density is 1.5 and the density of the soda bottles is 1.4, so the soda bottles would float to the top. Once the soda bottles float to the top i would use several nets to skim the top of the Concentrated sugar water to get the soda bottles out. All that would be left would be the Aluminum soda cans which would would be on the bottom of the pool and in would use several nets to scoop them from the bottom.

Sincerely,
Diana Lane

Why Chemistry is the most importatant science.

Chemistry is he study of matter and the change it undergoes. Without Chemistry we wouldnt be able to enjoy ice cream! We use chemistry to be able to make ice cream, cook, make medicine, etc. Without chemistry we wouldn't have have medicine and without medicine we could all die...  There could be widespread epidemics and no one would be able to do anything about it! We also use chemistry so that we have electricity.Without electricity our life would be very simple and boring. We probably wouldn't even be able to survive without chemistry since air is matter and it undergoes changes so that we can breath.