How many moles of KClO3 must be reacted according to the following balanced chemical reaction to transfer -34.2 kJ of heat? 2 KClO₃(s) → 2 KCl(s) + 3 O₂(g) ∆H = -89.4 kJ

Silica, sio2, is formed on silicon as an electrically insulating layer for microelectronic devices. silica is formed when silicon is exposed to o2 gas at an elevated temperature. at 900˚c, it takes 90 minutes for the oxygen to diffuse from the surface to form a 0.06 micron (0.06 x 10-6 m) thick layer of sio2 on

Which of the following would be an accurate picture of the earth during the summer time of the northern hemisphere?

As changes in energy levels of electrons increase, the frequencies of atomic line spectra they emit