Explanation:
The electronegativity difference in C-C and C-H atoms is quite low. This means smaller the electron cloud. This further means larger bond length that is electron's are further from the nucleus. hence, higher potential energy of C-C and C-H bonds.
On the contrary, C-O and H-O have large difference in electronegativity( O is high electronegative element) . This means smaller bond length. Electron's near the nucleus. Thus, lower potential energy of bonds.
For a 20g sample it will take 24 minutes therefore for a 5g sample it will take 6 minutes
Organ system, because there are multiple organs that work together to help make the body function.
I believe the answer is orbital hybridization theory
