Question

Im taking a 50 question test and these are the only 3 question im stuck on please help???
Which of the following combinations of reactants will result in a synthesis reaction?
a. Cl2 + HBr b.Ca + H2O c.MgO + H2O d.C2H2 + O2
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Which of the following compounds will produce H2O as one of the products when it decomposes?
a. Cu(OH) 2 b.Hg(ClO3)2 c.MgCO3 d.CaO
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Which of the following is a synthesis reaction?

a. C2H4 + 3 O2 2 CO2 + 2 H2O

b.2HCl H2 + Cl2

c. 2K + 2 HCl 2 KCl + H2

d.SO3 + H2O H2SO4

Answer 1

The first one is d). It's an addition reaction.
The second one is a). Cu(OH)2.
The third one is d).

Answer 2

thank you