Question

which substance cannot be broken down by a chemical change?
1) ammonia
2) ethanol
3) propanol
4) zirconium

Answer 1

Zirconium cannot be broken down by a chemical change, because it is an element. The others are all molecules. Hope ive helped :)

Answer 2

Answer:

Zirconium

Explanation:

This is because if you look it up in the periodic table you cannot break it apart by a chemical.