Using standard absolute entropies at 298K, calculate the entropy change for the system when 1.62 moles of NH4NO3(aq) react at standard conditions.

Which metals are called noble metals

Which statement is true about the model of the electromagnetic spectrum a: it change the frequencies of light. b: it compare wavelengths of light. c: the color of light waves can be changed using the model. d: the intensities of light waves can be decreased using the model.

Why must humans find substitutes for many minerals found on earth? (a) form at an extremely slow rate (b) controlled by other countries (c) too deep in the earth to collect