CAN SOMEONE HELP? Quartz crystals and salt crystals mixed together were put into a vase and placed on display by mistake. there is a concern about the safety of the salt involved. you are asked to remove the salt and just use the quartz crystals in the vase. All the particles are the size of fish tank gravel and are the same colour appearance and texture.

a) How will you separate this, leaving only the quartz?

b) Continuing from your last question, how can you collect each substance so that you can put each in its own container as a solid? Be detailed regarding your process. Your answer should conclude with a vase containing quartz crystals and a container with salt crystals.

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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).