Question

Which substance can not be broken down by a chemical change? silicon propane ethane water

Answer 1

`\huge \boxed{\mathrm{silicon}}`

Step-by-step explanation:

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

Silicon is a chemical element with the symbol Si and atomic number 14.

Answer 2

i think the answer is silicon :))