Because group 1a and 2a are most reactive due to their least number of electrons in their outmost shell compared to group 8a(18)
Combustion means the burning of something. So in the given question, you could say, “In this question, combustion means the burning of methane”.
C.
jk dont do it hehehehe
There are two possible situations.
1) If a phase change is not occurring, then the heat added contributes to increased translational energy of the particles. What that means is the particles move/vibrate faster.
2) If a phase change is occurring, then the heat added contributes to the breaking of bonds or intermolecular forces (depending on the chemical nature of the matter you're dealing with).
