Question

Which of the following balanced equations represents a chemical change?
1. H2O(l) + energy --> H2O(g)
2. H2O(g) --> H2O(l) + energy
3. 2H2O(l) + energy -->2H2(g) + O2(g)
4. H2O(l) -->H2O(s) + energy

Answer 1

Answer:

3. 2H2O + energy ------> 2H2 +2O2

This reaction represents a chemical change.

Thank u so much

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Answer 2

Answer:

option 3 is represents a cgemical change...