Che 103 chapter3 - Che 103 chapter3

Che 103 chapter3

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Unformatted text preview: Chemical Reactions Reactants: Zn + I2 Product: ZnI2 Chemical Reactions Evidence of a chemical reaction: Evidence • Gas Evolution • Temperature Change • Color Change • Precipitation (insoluble species forms) In general, a reaction involves a rearrangement or change in oxidation state of atoms from reactants to products. Chemical Equations Chemical Equations show: • the reactants and products in a reaction. reactants products • the relative amounts in a reaction. Example: 4 Al(s) + 3 O2(g) → 2 Al2O3(s) • The numbers in the front are called stoichiometric coefficients • The letters (s), (g), (l) and (aq) are the physical states of compounds. Chemical Equations 4 Al(s) + 3 O2(g) → 2 Al2O3(s) This equation states that: 4 Al atoms + 3 O2 molecules react to form 2 formula units of Al2O3 or... 4 moles of Al + 3 moles of O2 react to form 2 moles of Al2O3 Chemical Equations Law of the Conservation of Matter Conservation •Because the same number of atoms are present in a reaction at the beginning and at the end, the amount of matter i...
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