Question

Help pls!! Due in 30 mins!

Which equation represents a single replacement reaction?
1. 2Al(s) + 3Cl2(g) → 2AlCl3(s)

2. 2Al(s) + 6HCl(aq) + 2AlCl3(aq) + 3H2(g)

3. 2AlCl3(s) → 2Al(s) + Cl2(g)

4. AlCl3(aq) + 3KOH(aq) + Al(OH)3(s) + 3KCl(aq)

Answer 1

2. 2Al(s) + 6HCl(aq) + 2AlCl3(aq) + 3H2(g) represents a single replacement reaction

Further explanation

A single replacement reaction is a chemical reaction in which one element replaces the other elements of a compound to produce new elements and compounds

Not all of these reactions can occur. We can use the activity series(voltaic series), which is a list of elements that can replace other elements below / to the right of them in a single replacement reaction.

1. 2Al(s) + 3Cl2(g) → 2AlCl3(s)

Syntesis/combination reaction

2. 2Al(s) + 6HCl(aq) ⇒2AlCl3(aq) + 3H2(g)

Single replacement reaction

3. 2AlCl3(s) → 2Al(s) + Cl2(g)

Decomposition reaction

4. AlCl3(aq) + 3KOH(aq) + Al(OH)3(s) + 3KCl(aq)

Double  replacement reaction

Answer 2

In a single replacement reaction, one element replaces another one. The reaction that shows the single replacement reaction is:

$\bold { 2Al(s) + 6HCl(aq) \rightarrow 2AlCl_3(aq) + 3H_2(g)}$

 

Single replacement reaction:

• It is a chemical reaction in which one element of the reactant compound replaces the other elements of another compound to form a new molecule.

• In these reactions, a more active element replaces the less active element.

$\bold { 2Al(s) + 6HCl(aq) \rightarrow 2AlCl_3(aq) + 3H_2(g)}$

In the given reaction, aluminum replaces the hydrogen from hydrochloric acid to form Aluminum chloride.

Therefore, the reaction that shows the single replacement reaction is:

$\bold { 2Al(s) + 6HCl(aq) \rightarrow 2AlCl_3(aq) + 3H_2(g)}$

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