APchapter2notes - Chapter2Notes Life Concept2.1 mass...

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    Chapter 2 Notes The Chemical Context of  Life
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    Concept 2.1 Organisms are composed of  matter anything that takes up space or has  mass Element : a substance that cannot be  broken down by chemical reactions Compound : substance consisting of two  or more elements in a fixed ratio
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    Concept 2.1 Life requires about 25 elements 4 of those make up 96% of living matter Carbon, Oxygen, Hydrogen, and  Nitrogen Trace Elements are those that are  required in only minute quantities -ex. Iron, iodine
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    Concept 2.1
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    Concept 2.2 Atom : smallest unit of matter that still  retains the properties of an element Subatomic particles : Protons (+),  Neutrons (0), Electrons (-) Protons and Neutrons have a mass of 1  dalton.  Electrons have no mass
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  Concept 2.2 Atomic number : # of protons Mass number : sum of protons + neutrons Isotopes : different atomic forms of an  element. -ex. Carbon-12 (99%), Carbon-13 (1%), 
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APchapter2notes - Chapter2Notes Life Concept2.1 mass...

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