Why is hydrogen placed with the elements in group 1a? ?

The drawing represents the movement of particles in a substance. what changes of state can this substance undergo

Kp is the equilibrium constant for dissociation of the propionic acid dimer. what is the sign of the slope for a plot of the natural logarithm of kp vs. inverse temperature for this reaction?

Can anyone answer these questions? ? i need it before 1: 00pm today