Question

Which of these represents a synthesis reaction?

A. AgNO3 + HCl -> AgCl + HNO3
B. Zn + 2HCl -> ZnCl2 + H2
C. N2 + 3H2 -> 2NH3
D. 2KClO3 -> 2KCl + 3O2

Answer 1

Answer: The correct answer is Option C.

Step-by-step explanation:

Synthesis reaction is defined as the chemical reaction in which two substances combine their elemental state to form a single compound.

The general chemical equation representing this reaction follows:

`A+B\rightarrow AB`

For the given options:

Option A:
`AgNO_3+HCl\rightarrow AgCl+HNO_3`

This reaction is a double displacement reaction because here exchange of ions takes place.

Option B:
`Zn+2HCl\rightarrow ZnCl_2+H_2`

This reaction is a single displacement reaction because here more reactive metal displaces a less reactive metal.

Option C:
`N_2+3H_2\rightarrow 2NH_3`

This reaction is a synthesis reaction because here, hydrogen and nitrogen gases are reacting to form a single compound ammonia.

Option D:
`2KClO_3\rightarrow 2KCl+3O_2`

This reaction is a decomposition reaction because here one substance is producing two smaller products.

Thus, the correct answer is Option C.

Answer 2

C is a synthesis reaction. This is because two different groups of molecules are forming into one group of molecules.