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

Responses

2H2
+ O2
→ 2H2
O
2H2+ O2 → 2H2O



219/86
Rn → 215/84
Po+α

219 over 86Rn → 215 over 84Po+α

H2
O(s) → H2
O(g)
H2O (s) → H2O (g)

C2
H5
OH(l) → C2
H5
OH(g)

1 answer

A chemical change involves a transformation that results in the formation of new substances with different properties.

  1. The equation 2H2 + O2 → 2H2O shows a chemical change because it represents the formation of water from hydrogen and oxygen gas.

  2. The equation 219/86 Rn → 215/84 Po + α also shows a chemical change due to the radioactive decay of radon (Rn) into polonium (Po) and an alpha particle.

  3. The equation H2O(s) → H2O(g) depicts a physical change (phase change from solid to gas) rather than a chemical change.

  4. The equation C2H5OH(l) → C2H5OH(g) is also a physical change (phase change from liquid to gas) rather than a chemical change.

Thus, both 2H2 + O2 → 2H2O and 219/86 Rn → 215/84 Po + α reflect chemical changes.