What did you observe about the properties of the sodium carbonate mixture before the substances were mixed 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

Asubstance is a good conductor of electricity which of the following best explains a probable position of the substance in a periodic table

What is the area in square meters of 448 g ai foil that has a thickness of 23921 nm? the density is 2.70 g/cm