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1， A + B → AB (combination reaction);
AB → A + B ( decomposition reaction)
2, The ionic compounds are usually the reactants in a double replacement reaction.
3, Combination reaction, because there are two reactants and there is only one product.
4, PQ + RS → PS + RQ
5, All metals beyond calcium
6, a) Combination reaction
b) Hydrogen gas + Oxygen gas → Water
2H2 + O2 → 2H2O
7, Combination reaction
8, a), Molecule compounds
b), Combination reaction
9, a) 2Al(s)+3Pb(NO2)2(aq)→2Al(NO2)2(aq)+3Pb(s)
10, Combination reaction; because there are two reactants and one product
11, a), Cl2 + 3F2 → 2ClF3 ; 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) ; Combustion reaction
12, Magnesium chloride
13, 2H2O2 (l) → 2H2O(l)+O2 (g)
14, a), it is a single reaction, it is the reaction that is the form A + BC → AC + B
b), it isn’t a single reaction, because there is no element produce
15, It will occur. Because zinc is much more active than lead, and it suits the form A + BC → AC + B