I need help with these two chemistry problems! Calculate the [OH-], pOH and pH of these solutions:
a) 0.50 mol/L KCN b) 0.20 mol/L NaClO

Calculate the number of kilojoules to warm 125 g of iron from 23.5°c to 78.0°c.

Why are people not able to skip a dive to the deepest part of the ocean

The characteristics of two different types of reactions are shown below: reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of an element. which statement is true about the atoms of the elements that participate in the two reactions? their identity changes in both reaction a and reaction b. their identity changes in reaction a but not in reaction b. their identity changes in reaction b but not in reaction a. their identity remains the same in both reaction a and reaction b.