As combining different elements or compounds together, it'll always have a new substance occure as a chemical change. Through this pocess, it's called REACTION.
By determining different type of reaction, we can obtain the finally result by our brain instead of "doing lab"
First: Sybthesis : A+B > C
4H + O2 = H2O
C + O2 = CO2
H + Cl = HCl
Sec: Decomposition (Hints, The OPPOSITES way of SYBTHESES)
A > B + C
K2S > K2 + S
2Na2O > 2Na + O2
Third: Single Deplacement:
A + BC > AC + B (Mental)
A + BC > BA+ C (Non mental)
Basicly, when one element(MENTAL) and a compound react together, the SINGLE MENTAL element will replace the mental of the COMPOUND.
Following the same format, the way of replacing Non-mental is the same as above
Moreover about Single Replacement:
The less active mental can't replace the other mental which is higher active than it.
To know what's the activity of each mental, we can take a look to our "periodic table" and figure it out
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