Chemical Elements and Water

... IB Biology SL III Ryan Martucci Topic: 2 - The Chemistry of Life Date: 11/15/02 Period: 8 Sub-topic: 2.1 - Chemical Elements and Water 2.1.1 1 State that the most frequently occurring chemical elements in living things are carbon, hydrogen, and oxygen. The most frequent occurring chemical elements in living things are first oxygen, which is 65% of organisms, then carbon that is 18.5 % of organisms, and then hydrogen, which is 9.5%. 2.1.2 1 State that a variety of other elements are needed by living organisms including nitrogen, calcium, phosphorus, iron, and sodium. A variety of other elements are needed by living organisms including nitrogen, calcium, phosphorus, iron, and sodium. Nitrogen is the fourth most needed element making up 3.3% of the organisms and the other elements named make up part of the 8% of trace elements. 2.1.3 1 State one role for each of the elements mentioned in 2.1.2. Nitrogen is responsible

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