What is a reactant? A- Solid particles that have been separated from a solution

B- A substance that has the ability to be dissolved by a solvent

C- A mixture in which a solid and a liquid or two liquids are mixed occurs

D- The substance present before a chemical reaction occurs

Achemistry student weighs out of phosphoric acid , a triprotic acid, into a volumetric flask and dilutes to the mark with distilled water. he plans to titrate the acid with solution. calculate the volume of solution the student will need to add to reach the final equivalence point. round your answer to significant digits.

Calculate the change in entropy if br2(l) is converted into gaseous br atoms. s° for br2(l) = 152.2 j/(mol•k) s° for br2(g) = 245.5 j/(mol•k) s° for br(g) = 175.0 j/(mol•k)

Electrons are extremely important to what area of technology? a) anti-aging research b) household product development c) electronics d) drug discovery