Which type of reaction is always spontaneous? A. an exothermic reaction that has an increase in disorder B. an exothermic reaction that has a decrease in disorder C. an endothermic reaction that has an increase in disorder D. an endothermic reaction that has a decrease in disorder​

Explain which group an element with the electron configuration 1s2 2s2 2p6 3s2 3p6 3d1 4s2 belongs to.

Achemistry student needs to standardize a fresh solution of sodium hydroxide. he carefully weighs out of oxalic acid , a diprotic acid that can be purchased inexpensively in high purity, and dissolves it in of distilled water. the student then titrates the oxalic acid solution with his sodium hydroxide solution. when the titration reaches the equivalence point, the student finds he has used of sodium hydroxide solution.calculate the molarity of the student's sodium hydroxide solution. be sure your answer has the correct number of significant digits.

Word equation for k(s) +h2o(l) yield koh (aq) + h2