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AllTestReviews - Biology Test 1 14:09 What is life?...

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Biology Test 1 14:09 What is life? Characteristics of living systems o Organization o Energy Use o Development o Reproduction o Evolve o Respond to the environment What scales are biologist interested in? o Atomic = 10^-8 meters  o Community/ Ecosystem = 10^6 meters Approaches to Biology o Reductionist Approach   learn by breaking EVERYTHING down o Whole-ist Approach   learn while subject is intact/ as a whole Why is atomic structure biologically important? Organisms are composed largely of 11 elements o Value for an avg. human is $930.00 o Difference between those chemicals and you…. .organization What determines solubility? o Like dissolves like
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o Likes in terms of polarity i.e. polar solutes dissolve in polar solvents and  vice versa What determines Polarity? Atom o Smallest unit of matter separable by normal chemical means o Smallest unit of matter that retains all of the properties of that element Proton   = 1 Dalton = +1 charge Neutron = 1 Dalton = 0 charge Electron ~ 0 Dalton = -1 charge Bohr’s Model: 2-D drawing of atom, proton neutron inside, electrons surround Atomic number = number of protons is an atom Atomic mass = protons and neutrons Valence The number of electrons that need to be gained or lost to fill the outer shell of  electrons Also predicts the number of bonds that an atom will form Chemical bonds Forms when atoms completely gain and lose electrons Strongest bond when  DRY Covalent bonds Forms when atoms share electrons If they are shared  EQUALLY it is  COVALENT If they are shared  UNEQUALLY then it is  POLAR COVALENT
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Strongest bond in water What determines the number of chemical bonds an element will form? Number of valence electrons Type of Electro negativity (how much an atom wants electrons) Hydrogen Bonds Weak attraction between atoms on different molecules or different molecules  or different parts of a large molecule (attraction between partial charges (polar)) Occurs between molecules that have polar covalent to ionic bonds ALWAYS involves hydrogen Molecules and Compounds Compound – substance consistency of 2 or more different atoms, in specific  proportions, bonded together in a specific pattern. Molecule – smallest unit you can have of a compound that retains all the  properties of that compound Molecular formulas Water   H2O Carbon Dioxide   CO2 Glucose   C(6)H(12)O(6) Gram molecular weight Mass of a substance equal to its molecular weight in grams Contains a constant number of molecules Avogadro’s Number of molecules 6.022 * 10^23 1 mole of molecule is one Avogadro’s Number
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This note was uploaded on 02/26/2010 for the course BIOLOGY Bio 1201 taught by Professor Wischusen during the Fall '09 term at LSU.

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AllTestReviews - Biology Test 1 14:09 What is life?...

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