1. Synthesis Decomposition Single Replacement Double Replacement

2. 1. Synthesis Synthesis …meaning to put together 2 (or more) reactants → 1 product first reactant second reactant product Examples: Ca + S →CaS 2 H 2 + O 2 →2 H 2 O H 2 O + CO 2 →H 2 CO 3 + this is so cool!!

3. 2. Decomposition Decomposition …meaning to break apart 1 reactant → 2 (or more) products reactant 2 different products Examples: C 2 H 6 →2 C+3 H 2 2 H 2 O→2 H 2 +O 2 +

4. 3. Single Replacement Single Replacement …meaning to replace one element in a compound with another element (Exchange the positively charged ions or the negatively charged ions) element + compound → new compound + element reactants 2 new products element compound new compound new element Examples: Zn+2 HCl→ZnCl 2 + H 2 Mg+Ca(NO 3 ) 2 →Mg(NO 3 ) 2 + Ca 2 Na+H 2 O→Na 2 O + H 2 ++

5. Double Replacement …meaning two compounds exchange their anions (negatively charged ions) compound 1 + compound 2  compound 3 + compound 4 Examples HNO 3 + NaCl  NaNO 3 + HCl 3 CaO + 2 AlCl 3  3 CaCl 2 + Al 2 O 3 + + 4. Double Replacement

6. Identify the reactions as synthesis, decomposition, single replacement or double replacement 2 Na + I 2  2 NaI HNO 3 + NaCl  NaNO 3 + HCl 2 KBrO 3  2 KBr + O 2 4 K + O 2  2 K 2 O C + O 2  CO 2 Li + KCl  LiCl + K

7. Identify the reactions as synthesis, decomposition, single replacement or double replacement …answers 2 Na + I 2  2 NaI HNO 3 + NaCl  NaNO 3 + HCl 2 KBrO 3  2 KBr + O 2 4 K + O 2  2 K 2 O C + O 2  CO 2 Li + KCl  LiCl + K

8. Review

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11. Classification Summary Synthesis A + B  AB 2 (or more) reactants 1 product 2 Na + Cl 2  2 NaCl Decomposition XY  X + Y 1 reactant 2 (or more) products 2 KClO 3  2 KCl + 3 O 2 Single Replacement A + BC  AB + C element + compound new compound + new element Mg + 2 HCl  MgCl 2 + H 2 Double Replacement PQ + RS  PS + RQ  compound 1  +  compound 2  compound 3  + compound 4  HCl + NaNO 3 NaCl + HNO 3

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