In the formation of alum, why is it appropriate to wash the sides of the
beakers/flasks with distilled water?
A. Extra water will evaporate away when the alum
crystals are formed.
B. Distilled water has potassium ions that are
needed to form the alum.
C. The alum is not soluble in water.

Nitric oxide (no) can be formed from nitrogen, hydrogen and oxygen in two steps. in the first step, nitrogen and hydrogen react to form ammonia: n2(g) + 2 h_2(g) rightarrow 2 nh_3 (g) delta h = -92. kj in the second step, ammonia and oxygen react to form nitric oxide and water: 4 nh_3(g) + 5 o_2(g) rightarrow 4no(g) + 6 h_2o(g) delta h = -905. kj calculate the net change in enthalpy for the formation of one mole of nitric oxide from nitrogen, hydrogen and oxygen from these reactions. round your answer to the nearest .

List four observations that indicate that a chemical reaction may be taking place

When the water vapor cools it condenses select a number that represents his process on the