Which of the following equations shows a chemical change?(1 point)

Question

Responses

NH3(g)→NH3(l)
N H 3, which is a gas right-arrow N H 3, which is a liquid

C3H8+5O2→3CO2+4H2O

C2H5OH(l)→C2H5OH(g)
C 2 H 5 O H, which is a liquid right-arrow C 2 H 5 O H, which is a gas

H2O(s)→H2O(g)

Answer 1

The equation that shows a chemical change is:

C3H8 + 5O2 → 3CO2 + 4H2O

This equation represents the combustion of propane (C3H8) in the presence of oxygen (O2), resulting in the production of carbon dioxide (CO2) and water (H2O). This is a chemical change because new substances are formed, which have different properties from the reactants.

The other equations listed are examples of physical changes, where the state of the substance changes (e.g., from gas to liquid or solid to gas), but the chemical composition of the substance remains the same.