A student carried out the electrolysis of a KI solution for a period of 15 minutes. He estimated that 8.5 X 10^-4 moles of OH - were produced.

- Write the two half reactions and the net reaction of the electrolysis

Do the positive ions tend to be metals or nonmetals?

The best fit curve line to an absorbance vs. concentration plot for standard solutions of a dye has a slope of 0.1815 mL/mg and intercept of 0.0477. A sample solution prepared of the same dye has an absorbance of 0.

How many grams of zinc metal will react completely with 8.2 liters of 3.5 M HCl? Show all of the work needed to solve this problem. Zn (s) + 2 HCl (aq) ZnCl2 (aq) + H2 (g)

Calculate the volume (in mL) of a 2.75 M solution that must be used to make 1.25L of a 0.150 M solution. M1V1 = M2V2 solve for V1 (the answer will be in the units of L), convert L to mL

Statement best describing why carbon is such an important element

If a particular ore contains 55.1 % calcium phosphate, what minimum mass of the ore must be processed to obtain 1.00 kg of phosphorus? Express your answer with the appropriate units.

Which best describes thermal energy? It is the difference between internal energies of two or more substances It is the sum of internal energies of two or more substances O It is the portion of internal energy that can be transferred from one

According to Neil's Bohr's atomic model, what occurs when an atom absorbs radiated energy? A) an electron shifts from a lower energy to a higher one B) an electron shifts from a higher energy lever to a lower one C) an electron spirals towards the

Which is true about dissolving a polar substance in water? A) the solvent particles are all nonpolar molecules B) the solute particles are carried into the solution C) the solute particles have no attraction for the solvent molecules D) the solute

Which societal problem can be solved, in part, by scientists identifying areas of high biodiversity? A. reducing the amount of pollution B. finding affordable housing C. protecting the environment D. providing access to clean water