Quìmica primero curso del paula
Transcript of Quìmica primero curso del paula
Today we shall look at four types of chemical reactions ……
1.Synthesis2.Decomposition3.Single replacement4.Double replacement
A chemical reaction takes place when two or more substances combine and yield one or more other substances with different characteristics.
Today we shall look at four types of chemical reactions ……
1.Synthesis2.Decomposition3.Single replacement4.Double replacement
Today we shall look at four types of chemical reactions ……
1.Synthesis2.Decomposition3.Single replacement4.Double replacement
Synthesis occurs when two substances combine
chemically to yield a new substance with different properties.
For example
Sodium plus Chlorine yield Salt Na + Cl NaCl
Decomposition takes place when a substance is
broken down into two or more substances with
different properties.
For example
2H2O O2 + 4HWater yields Oxygen and Hydrogen
Single replacement takes place when a substance takes the place of another substance in a compound.
For example
2Al + 3Ag2 S 3Ag + Al2S3
Aluminum plus Silver sulfide yields Silver plus Aluminum sulfide
Double Replacement takes place when substances exchange places.
For example
NaOH + H2SO4 Na2SO4 + H2O
Sodium hydroxide and Sulfuric acid yield Sodium sulfate and water