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8 May, 19:07

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

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Answers (1)
  1. 8 May, 20:41
    0
    Number 2. this is a chemical change cuz numbers 1, 3 and 4 are physical. So if you add the equation of 2 it has two molecules.
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