One difference between mixtures and pure substances is that a) mixtures can be physically separated. b) mixtures are made of one type of atom. c) pure substances have no chemical bonds. eliminate d) pure substances can be physically separated.

It takes 945.kj/mol to break a nitrogen-nitrogen triple bond. calculate the maximum wavelength of light for which a nitrogen-nitrogen triple bond could be broken by absorbing a single photon.

An atom of which element reacts with an atom of hydrogen to form a bond with the greatest degree of polarity ?

Dumbledore decides to gives a surprise demonstration. he starts with a hydrate of na2co3 which has a mass of 4.31 g before heating. after he heats it he finds the mass of the anhydrous compound is found to be 3.22 g. he asks everyone in class to determine the integer x in the hydrate: na2co3·xh2o; you should do this also. round your answer to the nearest integ