Achemist must prepare 550.0ml of hydrochloric acid solution with a ph of 1.60 at 25 degree c . he will do this in three steps: fill a 5 50.0ml volumetric flask about halfway with distilled water. measure out a small volume of concentrated (8.0 m) stock hydrochloric acid solution and add it to the flask. fill the flask to the mark with distilled water. calculate the volume of concentrated hydrochloric acid that the chemist must measure out in the second step. round your answer to 2 significant digits.

Electric charge is what ? a. kinetic energy b. radiation c. discovery d. electricity

Choose an equation that represents an enzyme-catalyzed reaction. (a) enzyme + substrate → enzyme-substrate complex (b) enzyme + substrate ←−→ enzyme + products (c) enzyme + substrate ←−→ enzyme-substrate complex → enzyme + products (d) enzyme + substrate ←−→ enzyme-substrate complex → enzyme-substrate complex + products

The table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 9 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of tthe table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 9 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of the two atoms? both are unreactive. both are highly reactive. a is unreactive and d is reactive. a is reactive and d is unreactive.