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