What is a rock made out of shells and corals cemented together

The bond energy for the van der waals bond between two helium atoms is 7.9×10−4ev. assuming that the average kinetic energy of a helium atom is (3/2)kbt, at what temperature is the average kinetic energy equal to the bond energy between two helium atoms

Which statement best describes the function of enzymes?

If i had 2 m naoh solution, what does the 2 m stand for? 2 molar, but 2 of a solute in 1