The equation from question 2 is not balanced and is missing a number at the beginning of the equation only - what should it be? Please provide number value only.

The drawing represents the movement of particles in a substance. what changes of state can this substance undergo

What can be found in the ionosphere

La reaccion entre monoxido de nitrogeno (no) y oxigeno para formardioxido de nitrogeno (no2) es un paso determinante para la formacion del smog, la reaccion es la siguiente: 2no + o2 = 2no2 cual sera el numero de moles de no2 que se formaran por la reaccion completa de 8 moles de oxigeno con suficiente monoxido?