A. use filter paper to separate the salt from the alcohol and water. heat the liquid mixture to the
boiling point of alcohol (78.29 °c) until all of the alcohol condenses into a separate flask and
leaves the water behind in the original container.

b. heat the mixture to the boiling point of alcohol (78.29 °c), allowing the alcohol to condense into a
separate flask. continue to heat the liquid to a temperature of 100 °c to distill off the water. the
salt will be left behind in the flask.

c. heat the mixture to the boiling point of water (100 °c), allowing the water to condense into a
separate flask. continue to heat the liquid to a temperature of 78.29 °c to distill off the alcohol.
the salt will be left behind in the flask.

d. use filter paper to separate the salt from the alcohol and water. heat the liquid mixture to the
boiling point of alcohol (78.29 °c) and allow the alcohol to condense into a second container.
continue to heat the mixture to a temperature of 100 °c to distill off the water.

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:

1. they vary with a higher number because boiling is way hotter than melting

considering the question as per the attachment

here we can see that the radon nuclide has 222 as the atomic mass number and 86 as the atomic number.

when it undergoes nuclear fission it gives polonium which has atomic mass number as 218 and atomic number will be 84 along with a helium nucleus which has 4 atomic mass number and 2 as its atomic number.

222 = 218 + 4 (atomic mass number)

86 = ? + 2; therefore ? = 86-2 = 84.

the atomic mass number of polonium will be 84.

qualitative observation deals with data that can be observed with our senses: sight, smell, touch, taste, and hearing. they do not involve measurements or numbers. for instance, colors, shapes, and textures of objects are all qualitative observations.