Synthesis
Decomposition
Single Replacement
Double Replacement
1. Synthesis
Synthesis …meaning to put together
2 (or more) reactants → 1 product
first reactant second reactant product
Examples:
Ca + S → CaS
2 H2 + O2 → 2 H2O
H2O + CO2 → H2CO3
+
this is so
cool!!
2. Decomposition
Decomposition …meaning to break apart
1 reactant → 2 (or more) products
reactant 2 different products
Examples:
C2H6 → 2 C + 3 H2
2 H2O → 2 H2 + O2
+
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 → ZnCl2 + H2
Mg + Ca(NO3)2 → Mg(NO3)2 + Ca
2 Na + H2O → Na2O + H2
+ +
Double Replacement …meaning two compounds exchange their anions (negatively charged ions)
compound 1 + compound 2 compound 3 + compound 4
Examples
HNO3 + NaCl NaNO3 + HCl
3 CaO + 2 AlCl3 3 CaCl2 + Al2O3
+ +
4. Double Replacement
Identify the reactions as synthesis, decomposition, single replacement or double replacement
• 2 Na + I2 2 NaI
• HNO3 + NaCl NaNO3 + HCl
• 2 KBrO3 2 KBr + O2
• 4 K + O2 2 K2O
• C + O2 CO2
• Li + KCl LiCl + K
Identify the reactions as synthesis, decomposition, single
replacement or double replacement …answers
• 2 Na + I2 2 NaI
• HNO3 + NaCl NaNO3 + HCl
• 2 KBrO3 2 KBr + O2
• 4 K + O2 2 K2O
• C + O2 CO2
• Li + KCl LiCl + K
Review
Classification SummarySynthesis A + B AB 2 (or more) reactants 1 product
2 Na + Cl2 2 NaCl
Decomposition XY X + Y 1 reactant 2 (or more) products
2 KClO3 2 KCl + 3 O2
Single Replacement A + BC AB + C element + compound new compound + new
element
Mg + 2 HCl MgCl2 + H2
Double Replacement PQ + RS PS + RQ compound 1 +compound 2compound 3+ compound 4 HCl + NaNO3 NaCl + HNO3
END
