(Potassium compounds are also important to a lesser extent in the manufacture of explosives.) Potassium tarnishes quickly in air due to a reaction of oxygen and moisture. There are three reactions involved in the deployment of an air bag. 8) Potassium in water Potassium is a highly reactive metal. They are stored in oil to stop air and water vapour coming into contact with them. The reaction of potassium and water is more vigorous than sodium’s: fizzing (hydrogen gas is released) potassium floats and moves around on the water; catches fire with a LILAC flame; potassium disappears; When the group 1 metals react with air they oxidise, showing a similar trend in reactivity as we go down the group of the Periodic Table. Visit Vedantu.com to read more about the Physical and Chemical Properties of Potassium. K + O2(g) = KO2 ΔG(20C) = -241.3kJ ΔH(20C) = -283.7kJ This reaction is spontaneous (ΔG negative), and HIGHLY exothermic (ΔH is highly negative). Early in the reaction, the potassium becomes so hot that it catches fire and burns with a characteristic pale lilac colour. 3.38 moles of sodium azide must be packed into the air bag module for the air bag to inflate(PV=nRT It is white with a silvery shine or luster. Sodium Azide, Potassium Nitrate, Silicon Dioxide are the initial reactants packed into the air bag module. If potassium is burned in air, the result is mainly formation of orange potassium superoxide. potassium is ur answer. ! Conclusion: wear safety equipment and stand well back! Group 1 elements react with moist air. In air: 4Li (s) + O 2 (g) → 2Li 2 O (s) Sodium and potassium produce a mixture of oxides, peroxides and super-oxides. Its atomic number is 19 and atomic weight is 39.098u. Expose it to air and it will quickly interact with oxygen and water vapor (which helps explain why you don't find it in nature). Those reactions are listed above. Potassium is a fine conductor of electricity and heat. In chlorine: 2Na (s) + Cl 2 (g) → 2NaCl (s) and similarly for the others. Its symbol is K taken from its Latin name Kalium. Liquid ammonia, if exposed to alkali metal, reacts with electrons much slower than water, forming a dark blue solution of solvated electrons. The typical flame colours for lithium (red) and sodium (yellow) can usually be seen and sometimes the lilac of the potassium flame. It is soft at room temperature. The reactions are ongoing this way: Relatively free electrons of potassium reduce water: $$\ce{2 e- + 2 H2O -> H2 + 2 OH-}\tag{1}$$ That leaves metal positively charged. Potassium is an alkali metal and is a part of group 1. Potassium - Potassium - Principal compounds and reactions with other elements: Of commercially produced potassium compounds, almost 95 percent of them are used in agriculture as fertilizer. Reaction with moist air.