Unit 1 Review Materials

Unit 1 Review Materials - • Electronegativity- attraction...

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Chapter 2 Matter Matter takes up space + has mass Made up of elements, which can not be broken down Compound- 2 or more elements in a fixed ratio Compounds are different than the elements that make them up 25 elements make up 92% of life CONH make up 96% of living matter Ca,P,Na,S make up 4% Trace elements are required by organisms to live Atoms Elements consit of atoms Atoms composed of sub-atomic particles- protons, neutorns, electrons Atomic #- # of protons in nucleus Atomic Mass- protons + neutrons Isotopes- same element w/ different # of neutrons Electrons Chemical behavior due to electron distribution Valence electrons in the outer most shell (valence shell) Element with full valence shells are inert Atoms with incomplete valence shells share electrons Bonds Single covalent bond- shares one pair of electrons Double covalent bond- shares two pairs of electrons Structural formula: H-H Molecular formula: H2
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Unformatted text preview: • Electronegativity- attraction of a shared electron in a covalent bond • Non polar- share electron equally Polar- unequal sharing of electron • Polar bonds create positive + negative reagions on molecules • Atoms transfer electrons from one another, forming Ionic bonds • Cation- + charged Ion • Anion- - charged Ion • Ionic bond- attraction between Cation + Anion • Salts form as crystals • Weak bonds- ionic and hydrogen bonds • Hydrogen Bond- positive charge of hydrogen attracts to negative charge of oxygen • Electronegatives are nitrogen + oxygen in living cells Chemical Reactions • Chemical reactions are making + breaking of chemical bonds • Reactants start chemical reactions, products are the result • All chemical reactions are reversable • Chemical equ is reached when forward + reverse reactions are equal...
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This note was uploaded on 02/26/2011 for the course BIO 1151 taught by Professor Robinson during the Spring '09 term at College of DuPage.

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Unit 1 Review Materials - • Electronegativity- attraction...

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