Chapter 2 Notes

Chapter 2 Notes - Chemical Context of life Chapter 2...

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Chemical Context of life Chapter 2 Chemistry Organisms are composed of matter Matter- anything that takes up space and has mass o Made up of elements Element- is a substance that cannot be broken down to other substances by chemical reactions o 92 recognized elements Compound- is a substance consisting of two or more different elements combined in a fixed ratio o Water has H and O elements and 2:1 ratio Matter having emergent properties 25 of 92 elements are essential to life o Carbon, oxygen, hydrogen, nitrogen make up more than 96% of living matter Trace elements are those required by an organism in only minute quantities Element Properties Atom- the smallest unit of matter that still retains the properties of an element Subatomic particles o Protons- positive charge o Neutrons- neutral o Electrons- negative Protons and neutrons make up the atomic nucleus John Dalton o Atomic theory around 1800 o Found a way to measure atoms and subatomic particles o Unit of measurement is Dalton Atomic number- the number of protons which an element has Mass number or Atomic Mass- sum of the protons and neutrons in the nucleus of an atom
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Chapter 2 Notes - Chemical Context of life Chapter 2...

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