Which of the following statements is completely correct? a. nh3 is a weak base, and h2co3 is a strong acid. b. h2co3 is a strong acid, and naoh is a strong base. c. nh3 is a weak base, and hcl is a strong acid. d. h2co3 is a weak acid, and naoh is a weak base. e. nh3 is a strong base, and hcl is a weak acid.

C) NH3 is a weak base (alkali), and HCl is a strong acid.

Explanation:

Remember that bases and acids are determined by the Ph of a the substances, NH3 has a Ph of 11 making it a weak base, strong bases have 12 or more, remember that neutral Ph is around 7, and HCl has a ph of 3.01 making it a strong acid, it has so the correct statement would be C) NH3 is a weak base (alkali), and HCl is a strong acid.

Remember that weak acids gor from 5 to 7 and weak bases go from 8-11

14 days is the half-life of phosphorus-32

most historians agree that gabriel mouton, the vicar of st. paul’s church in lyons, france, is the “founding father” of the metric system. he proposed a decimal system of measurement in 1670. mouton based it on the length of one minute of arc of a great circle of the earth (now called a nautical mile, 1852 meters). he also proposed the swing-length of a pendulum with a frequency of one beat per second as the unit of length (about 25 cm). a pendulum beating with this length would have been fairly easy to produce, thus facilitating the widespread distribution of uniform standards. over the years, his work was revised, improved, and extended by a number of french scientists.

the political sponsor of weights and measures reform in the french revolutionary national assembly was the bishop of autun, better known as talleyrand. under his auspices, the french academy appointed several committees to carry out the work of developing a usable system of weights and measures for france. one of the committees recommended a decimalized measurement system based upon a length equal to one ten-millionth of the length of a quadrant of the earth’s meridian (i.e., one ten-millionth of the distance between the equator and the north pole).