Nhat did the Curies conclude about radioactivity based on their studies? A-The amount of radioactivity is an extensive property because it varies as the amount of material varies.

B-The amount of radioactivity is an extensive property because it remains constant as the amount of material varies.

C-The amount of radioactivity is an intensive property because it varies as the amount of material varies

D-The amount of radioactivity is an intensive property because it remains constant as the amount of material varies.

Any vitamins or supplements can be obtained without prescription and are widely used as alternative from western medications. most supplements are not valued by the fda or any other drug and food agencies.

Ithink that the answer is b

Answer(false);

Vander waals forces are inter molecular bonds that exist within molecules of the same substance. a water molecule is made up of oxygen and hydrogen atoms which share electrons between each other. the vander waals forces are forces that exist between multitude of different  molecules of water. dipole dipole forces is the type of vander waals force that exist in water. the oxygen atom which is more electronegative pulls the shared electron closer to itself thus generating a partial negative charge while the hydrogen acquire a partial positive charge. these two different charges causes attraction to occur in water molecules.