Kate gathered three boxes of the same size made of different materials; glass, clear plastic, and aluminum painted black. She placed them on a window sill in the sun for
an hour and ten measured the temperature of the air in each box. In this experiment,
the temperature of the air recorded is a constant variable.

A. True
B. False

PLEASE HELP

Explanation:

False.

No. The temperature inside the container is a dependent variable. It depends on what the box is made of.

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: