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Identifying Chemical Reactions

Identifying Chemical Reactions. Synthesis Reactions (the get together). Combining two or more simple substances to make a more complex one. + A B AB A + B AB 2Na +Cl 2 2NaCl Analogy: Like Marriage.

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Identifying Chemical Reactions

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  1. Identifying Chemical Reactions

  2. Synthesis Reactions(the get together) • Combining two or more simple substances to make a more complex one. + • A B AB • A + B AB • 2Na +Cl2 2NaCl Analogy: Like Marriage

  3. Examples of Real Synthesis Reactions: • 2Ba + O2 -->2BaO • 4Cu + O2 -->2Cu2O • 2Cu + O2 -->2CuO • 2H2 + O2 -->2H2O • C + O2 -->CO2 • 2Na + Cl2 -->2NaCl2

  4. Decomposition(the break-up) • A complex substance breaks down into two or more simpler substances + AB A B • AB yieldsA + B • 2 H2O yields2H2 + O2

  5. Single Replacement(the replacement) • An uncombined element replaces an element that is part of a compound. • + + AB C AC B • AB + C yieldsAC + B • Zn + 2HCl yields ZnCl2 + H2 • Analogy : Like finding a new girlfriend

  6. Double Replacement(the Switch) • Atoms in different compounds trade places • + + AB CD AC BD • AB + CD AC + BD • CaCO3 + H2SO4 CaSO4 + H2CO3

  7. Combustion • A combustion reaction is when all substances in a compound are combined with oxygen, which then produces carbon dioxide and water. Combustion is commonly called burning. • CH₄ + O₂ CO₂ + H₂O

  8. Two or more elements or compounds combine to make a more complex substance A + B → AB AB → A + B Compounds break down into simpler substances Occurs when one element replaces another one in a compound AB + C → AC + B AB + CD → AC + BD Occurs when different atoms in two different compounds trade places A = Red B = Blue C = Green D = Yellow

  9. Identifying Chemical Reactions 2. Use colored pencils to circle the common atoms or compounds in each equation to help you determine the type of reaction it illustrates. Use the code below to classify each reaction. S = Synthesis D = Decomposition SR = Single Replacement DR = Double Replacement ____ P + O2 → P4O10 ____ Mg + O2 → MgO ____ HgO → Hg + O2 ____ Al2O3 → Al + O2 ____ Cl2 + NaBr → NaCl + Br2 ____ H2 + N2 → NH3

  10. ____ Na + Br2 → NaBr ____ CuCl2 + H2S → CuS + HCl ____ HgO + Cl2 → HgCl + O2 ____ C + H2 → CH4 ____ KClO3  →   KCl  +  O2  ____ S8 + F2 → SF6 ____ BaCl2   +   Na2 SO4 →     NaCl   +   BaSO4

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