Select true or false: the following net ionic equation correctly shows the result of this experiment: a piece of lead metal was added to an aqueous solution of copper(ii) nitrate, and within a few minutes it was observed that the lead turned black and crumbled. the characteristic blue solution of copper(ii) ions had faded. (note: lead forms a 2+ ion when it reacts.) pb(s) + cu2+(aq) → pb2+(aq) + cu(s)

Explanation:

A net ionic equation shows all the atoms whose oxidation state change, which is referred to as the species that participate of the reaction.

To write the net ionic equation you follow some basic steps:

        Use "aq" for aqueous solutions, "l" for liquids, "g" for gases, and "s"

        for solids.

        Use the solubility rules or data of solubility of the compounds to

        identify which compounds will precipitate (form solid product).

1) Molecular equation:

2) Ionization of the compounds.

3) Total ionic equation

4) Net ionic equation

The spectator ions are 2 NO₃⁻ (aq) (they did not change meaning that they did not participate in the reaction).

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).