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)

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

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:

Learn more about Single replacement reaction:

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

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

hi my dude or dudette

every chemical equation adheres to the law of conservation of mass, which states that matter cannot be created or destroyed. therefore, there must be the same number of atoms of each element on each side of a chemical equation.