So first we need to know what the formulas are:
Methane: 
Oxygen: 
Carbon Dioxide: 
Water: 
So then we follow the equation as specified in the question. Note that it does not need to be balanced, as the question states it wants the unbalanced equation:
→ 
This is the preliminary, unbalanced equation with the correct chemical formulas.
physical changes are those changes which can be reversed in their previous form like ice to water
chemical changes are those changes which cannot be reversed in their previous form
Answer:
Explanation:
From the question we are told that:
Volume of hydrogen 
Temperature 
Pressure of water 
Let
STP(Standard Temperature and pressure)
Generally the equation for ideal gas is mathematically given by
Therefore
(at STP(Standard Temperature and pressure))
I believe the answer would be D.
D.) "Electrons" <span>may be shared by or transferred to other atoms.
Hope this helps!</span>
