Energy can be neither O Energy can be O The total an)ount of and after any energy transfonnation. Energy TRANSFER is the Example: A cup of hot tea has Law of Conservation of Energy by ordinary means. froin one form to another.

Density and pressure

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.

A. pipe, good luck, hope you get it right