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Published byBritney Tate Modified over 6 years ago
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WARM UP Write a balanced chemical equation for the reaction between hydrogen gas (H2) and carbon monoxide gas (CO) to yield liquid methanol (CH3OH), including states of matter.
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Types of Reactions
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Precipitation Reactions
(aq) reactants create (s) product (s) is insoluble precipitate Table 4.2 Pb(NO3)2(aq) + 2KI(aq) PbI2(s) + 2KNO3(aq)
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Precipitation Reactions
Molecular equation The “normal” equation Pb(NO3)2(aq) + 2KI(aq) PbI2(s) + 2KNO3(aq)
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Precipitation Reactions
Ionic equation Write ionic(aq) as + and – ions Pb2+(aq) + 2NO3-(aq) + 2K+(aq) + 2I-(aq) PbI2(s) + 2K+(aq) + 2NO3-(aq)
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Precipitation Reactions
Net ionic equation Cancel ions that are the same on both sides of equation Pb2+(aq) + 2I-(aq) PbI2(s)
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Oxidation-Reduction Reactions
Transfers of electrons Alter charges of atoms in reactants and products Oxidation number Like ionic charge = charge of ion = 0 in free elements = 0 in full compounds in compounds, H = +1 O = -2 F = -1
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Oxidation-Reduction Reactions
Loss of e- Becoming more + from reactants to products Half-Reaction H2 + Cl2 2 HCl +1
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Oxidation-Reduction Reactions
Gain of e- Becoming more – from reactants to products Half-Reaction H2 + Cl2 2 HCl -1
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WRAP UP Explain how you can identify a precipitation reaction from an equation. Explain how you can identify an oxidation-reduction reaction from an equation.
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