Which change increases the electric force between objects?
O
Two neutral objects are moved closer together.
Electrons are added to two negatively charged objects.
Two oppositely charged objects are moved farther apart.
The charge on two positively charged objects is reduced.
O
O

Electrons are added to two negatively charged objects.

Explanation:

Two negatively charged objects repel each other.

If electrons are added to two already negatively charged objects, they wil become even more negatively charged, which increases the electric force between the objects.

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: