In 2011, the concentration of CO2 in the atmosphere as measured at the Mauna Loa Observatory exceeded 400 ppm. If the barometric pressure at that time had been 0.977 atm, what was the partial pressure of CO2 in the atmosphere (using 400.0 ppm as the concentration of CO2(g))?

Aquantity of that isotope to decay to 1/2 of  its original value

Van der waals forces are temporary electromagnetic forces established between uncharged atoms. some neutral molecules, when close together, can become temporarily “charged,” as electrons move around the atom. water is a polar molecule, the side of the molecule that the hydrogens bond to being more positive, and the opposite side bound to the lone pairs of electrons being more negative. this means that it participates in dipole-dipole interaction (non-polar exhibits dispersion forces), and it has the capacity for hydrogen bonding.