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Lettris is a curious tetris-clone game where all the bricks have the same square shape but different content. Each square carries a letter. To make squares disappear and save space for other squares you have to assemble English words (left, right, up, down) from the falling squares.
Boggle gives you 3 minutes to find as many words (3 letters or more) as you can in a grid of 16 letters. You can also try the grid of 16 letters. Letters must be adjacent and longer words score better. See if you can get into the grid Hall of Fame !
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Tips: browse the semantic fields (see From ideas to words) in two languages to learn more.
|Jmol-3D images||Image 1|
|Molar mass||110.262 g/mol|
912 °C (decomp)
|Solubility in water||converts to KSH, KOH|
|Solubility in other solvents||soluble in ethanol, glycerol
insoluble in ether
|R-phrases||, , , , ,|
|Main hazards||Dangerous for the environment (N)|
|Other cations||Sodium sulfide, Iron(II) sulfide|
|Related compounds||Potassium hydrosulfide, Potassium sulfite, Potassium sulfate|
| (what is: / ?)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Potassium sulfide is the inorganic compound with the formula K2S. The colourless solid is rarely encountered, because it reacts readily with water, a reaction that affords potassium hydrosulfide (KSH) and potassium hydroxide (KOH). Most commonly, the term potassium sulfide refers loosely to this mixture, not the anhydrous solid.
It adopts "antifluorite structure," which means that the small K+ ions occupy the tetrahedral (F−) sites in fluorite, and the larger S2− centers occupy the eight-coordinate sites. Li2S, Na2S, and Rb2S crystallize similarly.
In the laboratory, pure K2S may be prepared by the reaction of potassium and sulfur in anhydrous ammonia. 
Sulfide is highly basic, consequently K2S completely and irreversibly hydrolyzes in water according to the following equation:
For many purposes, this reaction is inconsequential since the mixture of SH− and OH− behaves as a source of S2−. Other alkali metal sulfides behave similarly.