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A combination reaction: C + O2 → CO2
A decomposition reaction: H2O → H2 + O2
Combination reaction is two elements reaction and create one compound; Decomposition reaction is one compound reaction and create two elements.
The compounds that can soluble in water is usually the reactants in double replacement.
Only combination reaction’s formula is A + B → AB , L + MN → LMN only accord with this formula.
PQ + RS → PS + RQ
5.carbon , oxygen
6. a) combination reaction
b) C +O2 = CO2
7. It is combination reaction, because only combination reaction’s formula is A + B → AB.
8. a) Compound that can burn in the oxygen.
b) Combination reaction
9. a) 2Al(s) + 3Pb(NO3)(aq)= 2Al(NO3)(aq) + 3Pb(s)
b)Pb(CH3COO)4(aq) + Na2SO4(aq) → CH3COONa ﹒ 3H2O(aq) + PbSO4(aq)
10. It is combination reaction. Because the reaction is two elements reaction and create one compound.
11. a) Cl2(g) + 3F2 （ g ） = 2ClF3(g)combination reaction
b) 2C (s)+ O2 (g)= 2CO (g)combination reaction
c) Br2(aq) + MgI2(aq) = MgBr2(aq) + I2(aq)single replacement
d) Fe3O4(s) = Fe2O3(s) + FeO(s)decomposition reaction
e) N2O4(g) = 2NO2(g)decomposition reaction
12. magnesium chloride
2H2O2(aq)= 2H20(l) + O2 （ g ）
14.A is the single replacement reaction , because the single replacement reaction is a element and a compound reaction generation a new element and a new compound. But there are two compounds be a product in B.
15. No, because the activity of zinc is stronger the activity of lead.