A student performed a similar experiment with four hypothetical cations, A, B, C, and D and two hypothetical anions, X and Y. Her data is below: Analyte X Y
A+ yellow ppt yellow ppt
B+ white ppt clear, colorless solution,
C+ clear, colorless solution, NR clear, colorless solution, NR
D+ white ppt blue ppt
The student was then provided with an unknown containing one of the anions above. She reacted it with the four hypothetical cations, A, B, C, and D, her results are below: Analyte unknown yellow ppt Which of the following statements is most true with regard to this data?
a. More tests would need to be performed to identify the anion in the unknown.
b. The unknown anion is most likely Y
c. The unknown anion is most likely X

oxygen, selenium, tellurium, and polonium.

they're all from the same group as sulfur (group 16).

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).

the answer is true. hope it .