Chapter_02_The_Chemical_Context_of_Life - The Chemical...

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T he Chemical Context of Life Subatomic Particles, Atom and Molecules Atom – the smallest unit of matter that still retains the properties of an element Atoms are made of smaller substance – subatomic particles Three types of subatomic particles (neutrons, protons, electrons) Electrons – negatively charged Proton – positively charged Neutrons – no net charge Atomic Number – number of protons Atomic Weight Protons + neutrons Isotopes – atoms with the same numbers protons but different numbers of neutrons. Some isotopes (ex. C 14) are radioactive – they spontaneously give off particles and energy. Potential chemical energy – energy stored with a matter because of its position or location Electrons at different potential energy states belong in energy levels or energy shells Basic Concepts Electron configuration - determine the chemical characteristic of an substance Atoms and Molecules Chemical Elements and Compounds Molecular bonding Molecules structures - determine biological functions Chemical Elements and Compound Matter – anything substance that takes up space Element - substance that cannot be broken down to other substance by chemical reaction (ex. O, Na, Cl) Compound – substance consisting of
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This note was uploaded on 04/01/2012 for the course BIO 141 taught by Professor Dr.cafferty during the Spring '11 term at Emory.

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Chapter_02_The_Chemical_Context_of_Life - The Chemical...

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