Question

Which is a characteristic of a decomposition reaction?

1.Substance P replaces X in the compound XY.
2.Substance XYZ breaks down into X, Y, and Z.
3.Substance Z burns in the presence of oxygen to form ZO.
4.Substance X combines with Y to form compound XY.

Answer 1

the answer is probably 2

Answer 2

2. Substance XYZ breaks down into X, Y, and Z.

Explanation:

In a decomposition reaction, one substance breaks down into two or more simpler substances. Thus, the reaction

XYZ ⟶ X + Y + Z

is a decomposition reaction.

1. is wrong.

P + XY ⟶ PY + X

is a displacement reaction.

3. is wrong.

2Z + O₂ ⟶ 2ZO

is an oxidation or a combination reaction.

4 is wrong.

X + Y ⟶ XY

is a combination reaction.