Question

Which substance cannot be broken down by a chemical change brutanal, propene, gold, and water

Answer 1

`\huge \boxed{\mathrm{gold}}`

Step-by-step explanation:

Gold cannot be broken down by any physical or chemical methods, because it is an element. It has properties of an element not a compound nor mixture.

Gold is a chemical element with the symbol Au and atomic number 79.

Answer 2

Gold

Explanation:

We cannot break down elements by a chemical change.

Gold is the only element in the list

Butanal, propene, and water are wrong. They are compounds, so they can be broken down into their elements.