Iron filings are placed in powdered sulfur. Both iron and sulfur are elements. The iron and
sulfur are stirred together until they reach a uniform composition. Then the iron filings are
removed from the sulfur with the use of a magnet. What type of substance is the iron and
sulfur combination?

A. A pure substance
B. A compound
C. An element
D. A mixture

An aqueous solution of hydroiodic acid is standardized by titration with a 0.186 m solution of calcium hydroxide. if 26.5 ml of base are required to neutralize 20.3 ml of the acid, what is the molarity of the hydroiodic acid solution? m hydroiodic acid

Calculate the ratio of h+ ions to oh– ions at a ph = 7. find the concentration of h+ ions to oh– ions listed in table b of your student guide. then divide the h+ concentration by the oh– concentration. record this calculated ratio in table a of your student guide. compare your approximated and calculated ratios of h+ ions to oh– ions at a ph = 7. are they the same? why or why not? record your comparison in table a. what is the concentration of h+ ions at a ph = 7? mol/l what is the concentration of oh– ions at a ph = 7? mol/l what is the ratio of h+ ions to oh– ions at a ph = 7? : 1

Ineed this asap part i: scientific method what is the difference between science and pseudoscience? what is the scientific method?