Who first published the classification of the elements that is the basis of our periodic table today

What is the ph of a solution that has a hydrogen ion concentration of 1.0 * 10 -9 m?

Witch two conditions can limit the usefulness of the kinetic molecular theory in describing gas behavior?

When hydrogen peroxide (h2o2) is added to potassium iodide (ki) solution, the hydrogen peroxide decomposes into water (h2o) and oxygen (o2). the chemical equation for the decomposition reaction is: 2h2o2—> 2h2o + o2. what is the role of the potassium iodide in this reaction? a. reactant. b. product. c. precipitate. d. catalyst.