Describe the test for iodide ions

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

Which description best characterizes the motion of particles in a solid?

4. propanol and isopropanol are isomers. this means that they have a) the same molecular formula but different chemical properties. b) different molecular formulas but the same chemical properties. c) the same molecular formula and the same chemical properties. d) the same molecular formula but represent different states of the compound