Why is a chemical equilibrium described as dynamic? because maximum randomness has been achieved. because the pressure and temperature do not change. because both reactants and products continue to form. because the concentrations of chemical species remain constant. because the reactant and product molecules are in constant motion.

Because both reactants and products continue to form.

Explanation: Characteristics of chemical equilibrium:

Equilibrium is reached when the rate of the forward reaction is equal to the rate of the reverse reaction

Chemical equilibrium is attained in a closed system.

The macroscopic properties remains constant like: volume, pressure, energy etc.

The concentration of the reactants and products remain constant.

The reactants and products keep on forming.

Thus  when equilibrium is reached, the reaction is still occurring in both directions, but the rates of forward and backward direction are equal so there is no net change in the concentrations of the reactants or products.

b.

the accuracy of the data.

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).