After walking across a rug, James feels a spark between his hand and a doorknob.

James has observable evidence that his body was charged when he touched the doorknob. What is a reasonable explanation for how James’s body became negatively charged?

A Atoms moved from the rug to his body.
B Electrons moved from the rug to his body.
C Neutrons moved from the rug to his body.
D Protons moved from the rug to his body.

The air is going to come out because of the low pressure.

The product formed when bao and h2o  react together is                        ba(oh)2that is  bao + h2o = ba(oh)21 mole of    bao    react  1 mole of h2o  to    form  1 mole  of ba(oh)2

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.

Remember that rust prevented by placing a sacrificial electrode in electrical contact with the iron. the sacrificial electrode must be composed of a metal that  oxidizes  more easily than iron (that is, it must be below iron in table 18.1).