dolor (plural dolors) ( 1 literary) Sorrow, grief, misery or anguish. 2  A unit of pain used to theoretically weigh people's outcomes.
Potassium, K. Reaction with water. When a small piece of potassium is added to water, it produces a hissing sound as it burns with a lilac flame. It also moves about quickly on the water surface. [ image ]. Hydrogen gas is given out in the reaction. The resulting alkaline solution will turn red litmus blue because of the potassium hydroxide formed.
Potassium, sodium, lithium and calcium react with cold water, see alkali metals and alkaline earth metals. Metals in the reactivity series from magnesium to iron. react with steam - H2O(g) but not water - H2O(l). The reaction forms the metal oxide and hydrogen gas. You must know the test for hydrogen gas. magnesium + steam magnesium oxide + hydrogen.