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Chemical Changes – Part Deux

Chemical Changes – Part Deux. Types of chemical changes. Synthesis & Decomposition Precipitation Oxidation Combustion Acid -Base Neutralization Cellular Respiration & Photosynthesis. 1. Synthesis and Decomposition.

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Chemical Changes – Part Deux

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  1. Chemical Changes – Part Deux

  2. Types of chemical changes • Synthesis & Decomposition • Precipitation • Oxidation • Combustion • Acid-Base Neutralization • Cellular Respiration & Photosynthesis

  3. 1. Synthesis and Decomposition • Synthesis Reaction: The combination of two or more reactants to form a new product • Decomposition: The separation of a compound into two or more compounds or elements 2H2 + O2 2H2O A + B  AB 2H2O 2H2 + O2 AB  A + B

  4. 2. Precipitation

  5. 2. Precipitation CdSO4(aq) + K2S (aq) →  CdS(s) + K2SO4 (aq) 2 NaOH(aq) + MgCl2 (aq) → 2 NaCl(aq) + Mg(OH)2(s) CuSO4(aq)+  2NaOH(aq)→ Cu(OH)2(s)+ Na2SO4(aq)

  6. 2. Precipitation Formation of an insoluble, or only slightly soluble, solid substance (precipitate), when two aqueous solutions are combined

  7. 3. Oxidation

  8. Oxidation Chemical change involving oxygen or a substance with properties similar to those of oxygen

  9. 4. Combustion – a type of oxidation Form of oxidation that releases a large amount of energy

  10. 5. Acid-Base Neutralization Reaction of an acid with a base to form a salt and water Acid (aq)+ Base (aq) Salt (aq)+ Water (l) If H+= OH-? If H+ > OH- ? If H+ < OH- ? H+ ions OH- ions

  11. Heart Burn Stomach Acid + Antacid Salt + Water

  12. Neutralization of HCl and NaOH NaCl(aq)+ H2O (l) HCl(aq)+ NaOH(aq) HCl(aq) H+(aq)+ Cl-(aq) NaOH(aq) OH-(aq)+ Na+(aq) H2O NaCl

  13. Recognizing Acid-Base Neutralization Reactions HCl (aq)+ NaOH (aq) NaCl(aq)+ H2O (l)

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