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1.A combination reaction is two or three elements react at some situations to product compound.
Such as 2H2+O2--2H2O
A decomposition reaction is one compound react at some situation to product two or three elements.
Such as 2H2O--2H2+O2
2.It always be ionic compounds.
5.It means Hydrogen and carbon.
7. Combination Reaction. Because this formula is consist of two reactants react to be one compound.
b)Incomplete Combustion Reaction
Single Replacement Reaction
Double Replacement Reaction
10. Combination Reaction. Because this formula is consist of two reactants react to be one compound.
14.The first one is a single replacement reaction. A single replacement means that one reactant replace the element of another compound reaction, and formed a new compound production and one element.
15.I think there is a single replacement. Because the Zinc is more active than Lead. So that Zinc can replace the element in Lead(II) Chloride. This reaction will occur.