Today we learned about the different kinds of chemical reactions that can occur. They are easily identifiable because each follows a specific pattern.
Synthesis:
A synthesis reaction is one in which two substances react to form a single substance.
Thus the equation A + B -------> AB
An example of a synthesis reaction is
__Ca + __CO3 -----> __CaCO3
As you can see, two substances combine to form one.
The balanced equation is
1 Ca + 1 CO3 ------> 1 CaCO3
Single Replacement
A single replacement reaction involves a compound and and element where atoms from the compound exchange places with the single element.
Thus the equation, AB + C = AC + B
An example of a single replacement reaction is
__NaCl + __I2 ------> __NaI + __Cl2
As you can see ,the iodine(non metal) traded places with the non metal in the NaCl equation, chlorine.
Balance : 2 NaCl + 1 I2 -----> 2 NaI + 1 Cl2
Decomposition:
As the name implies, it is the breaking down of a substance into two different substances.
Therefore, the equation looks like
AB-----> A + B
An example of a decomposition reaction is
__KNO3 ---> ___KNO2 + __O2
The potassium nitrate breaks down into potassium nitrite and oxygen.
Balance! 2 KNO3 ------> 2 KNO2 + 1 O2
Here are some helpful links!
http://chemistry.about.com/library/formulabalance.pdf For extra practice!
A very visual demonstration http://www.youtube.com/watch?v=tE4668aarck
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