Kate gathered 3 boxes of the same size of different materials: glass, clear plastic, and aluminum painted black. She placed them on a window sill in the sun for 1 hour and
then measured the warmth of the air in each box.
In this experiment, what is the time of 1 hour

controlled variable
Independent variable
dependent variable

Sorry i dont understand the question can you rephase it?

Nonmetal are moldable and easily shaped

Answerlimiting reactant;

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.