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Published byLynn Byrd Modified over 9 years ago
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Basic Chemistry Atom Building block of all matter Over 100 elements HONC, PS are 6 elements most commonly found in living organisms Molecule Combination of atoms by chemical bonds CO 2, H 2 O, C 6 H 12 O 6, O 2 O 2 is a molecule but not a compound. Explain.
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Mixtures Combination of more than one type of molecule Solution Homogeneous and clear solute solvent The solute is dissolved in the solvent Sea water, Kool-Aid
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Mixtures Heterogeneous Mixture Inconsistent and cloudy Muddy water, Blood, Soil
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Chemical Reactions The rearrangement of atoms 6 CO 2 + 6 H 2 O C 6 H 12 O 6 + 6 O 2 (Reactants) (Products)
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Chemical Reactions Exothermic Reaction Energy is released Endothermic Reaction more energy is used than produced. Activation Energy Energy req’d to start rxn Catalyst Decreases AE Speeds up rxns Energy Time
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H 2 O + H = H 3 O + OH -
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Acids and Bases Dissociation of water H 2 O H + + OH - pH Scale (each step is multiple of 10) Acid pH < 7 More H + than OH - Base pH > 7 More OH - than H + 01234567891011121314
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Chemical Reactions Review In an endothermic reaction where is the heat going to, the system or the environment? NH 4 NO 3 +heat NH 4 + + NO 3 - 6 CO 2 + 6 H 2 O + heat C 6 H 12 O 6 + 6 O 2 Is energy mostly released or absorbed? Is this reaction exergonic or endergonic? Where does the absorbed energy go?
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