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How could electron dot notation help predict an element's chemical activity? Algebra help! 0=cos(c/2)/2 this problem is getting a little intimidating can someone please give step by step detail on how to solve? How many KG into Litre? Why are some sedimentary rocks smooth and round while others are rough and jagged? Calculate the pH of 1.0 L of the solution that is 0.44 M in NH3 and 0.16 M in NH4Cl upon addition of 0.020 mol of solid NaOH. pKb = 4.75.?