Formula:
Speed = Distance ÷ Time
Solution:
Speed = 60 ÷ 20
= 3km/min
D because it includes both acceleration and direction.
The bigger molecule has more interactions and hence the higher b.p. CH3CH2OCH2CH3 is a bigger molecule than CH4 and CH3CH3, so has more dispersion forces. It also has dipole-dipole forces due to the polarised C-O bonds. CH3OH and CH3CH2OH have hydrogen bonds due to the very electronegative O atom bonded to the H atom
God bless
