Transcript Classifying Chemical Reactions

CLASSIFYING CHEMICAL REACTIONS
WHAT IS A CHEMICAL REACTION?
A chemical reaction is a process in which one or
more substances are converted into new
substances with different physical and chemical
properties. There are five types of chemical
reactions.
TYPES OF CHEMICAL REACTIONS
1.) DIRECT COMBINATION REACTIONS
(or synthesis reaction)
2.) DECOMPOSITION REACTIONS
(or analysis reaction)
3.) SINGLE-REPLACEMENT REACTIONS
4.) DOUBLE-REPLACEMENT REACTIONS
5.) COMBUSTION
1. DIRECT COMBINATION REACTIONS
(SYNTHESIS REACTIONS)
In a direct combination reaction, two or more
reactants come together to form single product.
A + B  AB
EXAMPLE: 2 Na + Cl2  2 NaCl
2. DECOMPOSITION REACTIONS
(ANALYSIS REACTIONS)
A decomposition reaction is a reaction in which
a single compound is broken down into two or
more smaller compounds or elements.
AB  A + B
EXAMPLE: CaCO3  CaO + CO2
3. SINGLE-REPLACEMENT REACTIONS
In a single-replacement reaction, an
uncombined element displaces an element that
is part of a compound.
A + BX  AX + B
EXAMPLE: Mg + CuSO4
 MgSO4 + Cu
4. DOUBLE-REPLACEMENT REACTIONS
In a double-replacement reaction, atoms or ions
from two different compounds replace each
other.
AX + BY  AY + BX
EXAMPLE: CaCO3 + 2 HCl  CaCl2 + H2CO3
5. COMBUSTION REACTIONS
Although the majority of chemical reactions fit
into one of the four categories of chemical
reactions, there are many reactions that do not.
Combustion reactions are reactions in which
something is burned. Oxygen gas will be a
reactant in this type of reaction.
EXAMPLE: 2Mg + O2  2MgO
CLASSIFY THE FOLLOWING REACTIONS:
1. 2KClO3  2KCl + 3O2
2. HCl + NaOH  NaCl + H2O
3. Mg + 2HCl  MgCl2 + H2
4. 2H2 + O2  2H2O