You heat apiece of iron from 200 to 400 k. what
happens to the atoms' energyof random motion?

when a piece of iron is heated from 200 kelvin to 200 kelvin, the kinetic energy of molecule increases which causes the random motion of molecules in random direction faster than before.

Explanation:

when a piece of iron is heated from 200 kelvin to 200 kelvin, the kinetic energy of molecule increases which causes the random motion of molecules in random direction faster than before.  

we know that Temperature is inversely proportional to inter molecular attraction, thus whenever temperature increases the forces that bind the molecules together are dissipating hence particle moves in random motion.

the grams   of   barium that   are in   2.3 x 10^23   atoms of barium   is   52.4 g (answer c)

    calculation

mass = moles   of ba   x molar   mass of ba

  molar mass of ba from periodic table=   137.3 g/mol

  use the   avogadro's law   constant   to   calculate the moles of barium

  that   is     1 mole =   6.02   x 10^23 atoms

                    ? moles = 2.3 x 10^23   atoms

by cross   multiplication

=(1 mole   x 2.3x 10^23 atoms)   / 6.02   x10^23 atoms)=   0.382   moles

mass   is therefore = 137.3   g/mol x 0.382 mol = 52.4 ( answer c)

explanation:

they vary. it used to be meat, grain, bread, candy, beverages, donuts, and fruits/vegetables. now they added exercise in.