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Chemical Reactions

Chemical Reactions. Chemical Reaction. the process by which one or more substances are changed into one or more different substances. REACTANTS the starting substances in a chemical reaction (the stuff on the left). PRODUCTS the final substances in a chemical reaction (the stuff on the right).

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Chemical Reactions

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  1. Chemical Reactions

  2. Chemical Reaction the process by which one or more substances are changed into one or more different substances

  3. REACTANTSthe starting substances in a chemical reaction(the stuff on the left)

  4. PRODUCTSthe final substances in a chemical reaction(the stuff on the right)

  5. REPRESENTATION OF PHYSICAL STATES IN EQUATIONS • (g) = gas • (l) = liquid • (cr) = solid (stands for crystalline) • (aq) = substance dissolved in water

  6. WRITING BALANCED EQUATIONS • STEP 1: Determine the reactants and the products • STEP 2: Assemble the equation • STEP 3: Balance the equation (get the same # of atoms of each element on each side)

  7. WARNING!!! Never Ever Ever CHANGE THE SUBSCRIPT

  8. SYNTHESIS two or more substances combine to form one new substance

  9. SYNTHESIS A + B  AB Na + Cl2 NaCl Pb(IV) + O2 Pb2O4

  10. when a substance breaks up into simpler substances DECOMPOSITION

  11. Decomposition AB  A + B NaCl  Na + Cl2 Pb2O4  Pb + O2

  12. one element displaces another in a compound SINGLE DISPLACEMENT

  13. Single Displacement Reaction

  14. Single Displacement AB + C  AC + B or CB + A NaBr + Cl2 NaCl + Br2 (NH4)2S + O2 (NH4)2O + S

  15. DOUBLE DISPLACEMENT the positive or negative portions of two compounds are switched

  16. Double Displacement AB + CD  AD + CB NaBr + Pb2S3 Na2S + PbBr3 K2SO4 + Ba(OH)2 KOH + BaSO4

  17. COMBUSTION (aka OXIDATION) hydrocarbon reacts with oxygen to form carbon dioxide and water

  18. Writing Balanced Equations When Given Words Only • STEP 1: Write out the symbols • STEP 2: Balance your charges (if needed) • STEP 3: Check for diatomics • STEP 4: Balance Equation

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