Two students, one living in Florida and the other living in Canada, decide to use rain gauges to compare the amounts of precipitation in their locations over the course of one week. In which months would a rain gauge provide the least accurate precipitation data for a comparison between Florida and Canada?

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.

Burned piece of steel wool does not gain mass. so only d could be true.

The independent is what is changed, the dependent is was is measured or the reaction.