Chapter 6: Chemical Reactions
Date:____________
Section 2: Classifying Reactions - Notes
Objectives:
 Classify chemical reactions.
Synthesis Reactions:

A synthesis reaction is a reaction in which ____________________________ substances react to
produce a ________________________________________.

When _________________________________ react, the reaction is always a synthesis reaction.
o

Example:
Two _____________________________ can also react to create __________ compound in a
synthesis reaction.

All synthesis reactions follow this general equation:
o
_______________________________
Decomposition Reactions:

A decomposition reaction is one in which a ____________________________________breaks
down into _________________________ elements or new compounds.
o

Example:
Decomposition reactions often require an ___________________________, such as _________,
_______________, or _____________________________, to occur.

Decomposition reactions follow this general equation:
o
______________________________
Single Displacement Reactions:

In a single-displacement reaction, _____________________________ displaces another in a
compound.
o

Example:
Usually a __________________ will replace another __________________, or a
__________________ will replace another _________________ in single displacement reactions

Single displacement reactions follow this general equation:
o
_______________________________
Double Displacement Reactions:

Double displacement reactions occur when __________ exchange between two compounds.
o

Example:
Double displacement reactions will always produce either a _____________________________,
________________, or a ___________.

A double-displacement reaction follows the general form
o
_____________________________________
Practice: Classify the following reactions:

Na2O(s) + H2O(l) ⟶ 2 NaOH(aq)

Ba(NO3)2(aq) + K2SO4(aq) ⟶ BaSO4(s) + 2 KNO3(aq)

2 Al(s) + Fe2O3(s) ⟶ Al2O3(s) + 2 Fe(l)

2 H2O2(aq) ⟶ 2 H2O(l) + O2(g)

Solid calcium reacts with chlorine gas to produce solid calcium chloride.
Practice: Write a balanced chemical equation for each synthesis reaction:

Ag(s) +
Br2(g)

Mg(s) +
Cl2(g)
Practice: Write a balanced chemical equation for each decomposition reaction:

Al2O3(s) 

H2O(l) 