Question

This is a __________ reaction and the product(s) is/are

A) single replacement; zinc chloride and hydrogen gas.
B) double replacement; zinc oxide and hydrogen gas.
C) synthesis; zinc chloride and hydrogen gas.
D) decomposition; zinc chloride and water.

Answer 1

A) Single replacement; zinc chloride and hydrogen gas

Answer 2

Answer: This is a single displacement reaction and the products are zinc chloride and hydrogen gas.

Step-by-step explanation:

Single displacement reaction is defined as the reaction in which more reactive element displaces a less reactive element from its chemical reaction.

`AB+C\rightarrow CB+A`

Element C is more reactive than element A.

Double displacement reaction is defined as the reaction in which exchange of ions takes place.

`AB+CD\rightarrow CB+AD`

Synthesis reaction is defined as the reaction in which smaller substances combine in their elemental state to form a larger substance.

`A+B\rightarrow AB`

Decomposition reaction is defined as the reaction in which a large substance breaks down into smaller substances.

`AB\rightarrow A+B`

For the given chemical reaction:

`Zn(s)+2HCl(aq.)\rightarrow ZnCl_2(aq.)+H_2(g)`

The reaction is considered as single displacement reaction.

By Stoichiometry of the reaction:

1 mole of zinc metal reacts with 2 moles of hydrochloric acid to produce 1 mole of zinc chloride and 1 mole of hydrogen gas.

Hence, this is a single displacement reaction and the products are zinc chloride and hydrogen gas.