Exam1Review - Dimitri Blondel Department of Biology...

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Dimitri Blondel Department of Biology University of Florida Office hours: Thursdays, periods 7 – 9 Location: 619 Carr Contact: [email protected] (BSC2010 in subject line!)
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EXAM REVIEW Chapter 1 Data: Qualitative Quantitative Reasoning: Inductive (specific to general) Deductive (general to specific)
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Chapter 2 Chemical context of life Organisms made up of matter Matter = takes up space and has mass Matter made up of elements Element = substance that cannot be broken down to other substances by chemical reactions Compound = two or more elements in a fixed ratio Elements made up of atoms Atom = smallest unit of matter that still retains properties of an element
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Nucleus Protons (+ charge) determine element Neutrons (no charge) determine isotope Atom Electrons (– charge) form negative cloud and determine chemical behavior Chapter 2 - Chemical context of life
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Name Charge Weight Proton Positive 1 dalton Neutron Neutral 1 dalton Electron Negative negligible* Subatomic Particles *1/2000 dalton Atomic number = number of protons in nucleus Mass number = sum of protons + neutrons Atomic mass ~ Mass number Chapter 2 - Chemical context of life
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Covalent bond - shared electron between two atoms Nonpolar covalent bond – equal sharing Polar covalent bond – unequal sharing Bonds δ δ δ H H O H 2 O Polar covalent bond in water molecule Chapter 2 - Chemical context of life
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Ionic bond – attraction between anion (-) and cation (+) Bonds Na Cl Na Cl Na Sodium atom Chlorine atom Cl Na + Sodium ion (a cation) Cl Chloride ion (an anion) Sodium chloride (NaCl) Chapter 2 - Chemical context of life
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δ - δ + δ δ - δ δ δ Water (H 2 O) Ammonia (NH 3 ) Hydrogen bond Hydrogen bond: Hydrogen atom covalently bonded to one electronegative atom is also attracted to another electronegative atom Chapter 2 Chemical context of life
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Chapter 2 Chemical context of life
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Van der Waals interactions Weak Allow all molecules and atoms to stick to each other (only when very close together) Bonds Chapter 2 - Chemical context of life
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Covalent bond - shared electron between two atoms Nonpolar covalent bond – equal sharing Polar covalent bond – unequal sharing Ionic bond – between anion and cation Hydrogen bond – between molecules containing hydrogen
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This note was uploaded on 02/25/2010 for the course BSC 2010 taught by Professor Bowes during the Spring '08 term at University of Florida.

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Exam1Review - Dimitri Blondel Department of Biology...

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