Wednesday, March 11, 2009

Elements

Elements are the building blocks of matter.They can not be broken down into smaller pieces.Only a few elements,such as, exist in nature in pure form.More than 98 percent of the materials in Earth's crust is made up of only eight elements Oxygen,silicon,aluminum,iron,calcium,pottasium,and magnesium.
Carbon,hydrogen,oxygen,and nitrogen make up 96 percent of the mass of the human body.Physical properties means to measure without changing the material.
Chemical properties tell how it forms a new substance when it forms with something else for example copper+zinc=brass.
What is the best metal conducter?Copper
What is water made of?It is made of two hydrogen atoms and one oxygen atom.
What is the sign for water?H2O
How do you separate salt from water?You can evaporate the water or use the filter to get the salt away.

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