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For each of the reactions below, classify as a combination, decomposition, single replacement, or double replacement. 1. Ca(s

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Answer #1

1. Two molecules Ca and Cl2 combine to form a new molecule CaCl2. So, it is a combination reaction.

2. Two molecules Cu and O2 combine to form a new molecule CuO. So, it is a combination reaction.

3. Ca displaces H atoms in H2SO4 and forms H2SO4 and at the same time H comes in place of Ca to form HNO3. So, it is a double displacement reaction.

4. Two molecules NH3 and HCl combine to form a new molecule NH4Cl. So, it is a combination reaction.

5. Hg displaces Na in NaI and forms HgI2 and at the same time Na comes in place of Hg to form NaNO3. So, it is a double displacement reaction.

6. Ag displaces Na in NaCl and forms AgCl and at the same time Na comes in place of Ag to form NaNO3. So, it is a double displacement reaction.

7. Zn displaces H in H2SO4 and forms ZnSO4 and H2 is released. So, it is a single displacement reaction.

8. H2CO3 is break down to CO2 and H2O. So, it is a decomposition reaction.

9. H2O is break down to O2 and H2. So, it is a decomposition reaction.

10. Two molecules Li and H2O combine to form new molecules LiOH and H2. So, it is a combination reaction.

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