•describe the various types of testing done to ensure the effectiveness of ads and discuss the rationale for each of these tests. understand the various types of pretests and posttest including lab tests, field studies, starch tests, day after recall, concept tests, etc. • what is the difference between a lab test and field test?

Answer it is also known as the completion state is untrue of the activation complex;

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.

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