<u>Answer</u><u>:</u>
Hydrocarbon and oxygen
<u>Explanation</u><u>:</u>
"a substance reacts with oxygen gas, it must involve O² as one of the reactants."
Using this, we can confirm Hydrocarbon and oxygen is a valid one.
Because there is a balloon to stop everything from coming out
The answer is MAGNESIUM OXIDE - MgO.
Good luck :)
