What is the representative particle for potassium chloride?

Scientist wants to react a barium chloride salt with an acid. to speed up the reaction, the scientist crushes the barium chloride salt until it is a fine powder. this speeds up the reaction by a. increasing the ph of the salt. b. increasing the surface area of the salt. c. increasing the pressure of the salt. d. increasing the temperature of the salt. im thinking more a not 100% sure

Answer explain why it is not possible to deduce a complete order of reactivity.

Ill give u brainliest pls how is mass of carbon conserved during cellular respiration