Which segments represent changes in kinetic energy of the molecules in the substance?
check all that apply.

a-b

b-c

c-d

d-e

e-f

It shows that the experiment is designed properly.

It is a mixture. simply put, a compound must be pure, that is, of only one chemical structure and composition. a mixture is made of different chemical substances (i.e. elements, molecules, compounds) that are not chemically bonded to each other, but instead physically grouped together, as in the case of gasoline (a homogeneous solution).