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Which balanced equation represents a chemical change?
(1) H2O(l) + energy → H2O(g)
(2) 2H2O(l) + energy → 2H2(g) + O2(g)
(3) H2O(l) → H2O(s) + energy
(4) H2O(g) → H2O(l) + energy

Sagot :

The answer is B because energy was added to 2H2O in order to produce a chemical change of 2H2 and 02 seperately.

(2) 2H₂O(l) + energy → 2H₂(g) + O₂(g)

When molecular hydrogen (H₂) and oxygen (O₂) are combined and allowed to react together, energy is released. This reaction can also be considered as an exothermic reaction.

  • The formation of water is a combination reaction.

2H₂(g) + O₂(g)→  2H₂O(l)

  • The electrolysis of water to give hydrogen and oxygen is a decomposition reaction.

2H₂O(l) + energy → 2H₂(g) + O₂(g)

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