THE THREE LAWS

177587.jpg
http://www.mostphotos.com/preview/177587.jpg

The Law of Conservation of Mass: The mass of a closed system will stay constant over time, regardless of the processes occurring inside the system. Mass cannot be made or destroyed but, it can be rearranged and changed into different types of particles. For example, when water is created from hydrogen and oxygen, atoms of each element are not lost or created; just rearranged.


File:Photosynthesis.jpg
File:Photosynthesis.jpg

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The Law of Constant Composition: A compound always has the same proportion of elements by mass. In H2O, every compound has 2g of hydrogen and 16g of oxygen.

Space filling model of a water molecule
Space filling model of a water molecule


The Law of Multiple Proportions: If two elements combine to form more than one compound, then the masses of the elements that combine are given in a small whole number ratio. The mass ratio of glucose is 6:12:6 or 1:2:1, which is equal to the ratio of the number of atoms in the compound.
Equation_#2.gif
external image 120px-Carbon-dioxide-3D-vdW.svg.png


Thank you:

http://en.wikipedia.org/wiki/File:Photosynthesis.jpg
http://en.wikipedia.org/wiki/Water_(properties)
http://en.wikipedia.org/wiki/Carbon_dioxide