Please help me with 9 and 10 don’t send me a link please tell me here

9. b

10. a

Density would have to do with if the powder is floating or sinking, conductivity would have to do with heat and mass would have to do with weight, leaving solubility as the only reasonable answer.

periodic trends is an atom that gets larger as the number of electronic shells increase, the radius of atoms increases as you go down a certain group in the periodic table of elements. in general, the size of an atom will decrease as you move from left to right of a certain period.