6:16 PM Mon Apr 19 +
Assessment
Chapter Test B
a
Chapter: Chemical Formulas and Chemical Compounds
PART I In the space provided, write the letter of the term or phrase that best
completes each statement or best answers each question.
1. Changing a subscript in a correctly written chemical formula will
change the electron configuration of that element
b. change the charges on the other sons in the compound.
c. change the formula so that it no longer represents the same compound.
d.
have no effect on the formula
2. Using the Stock system of nomenclature, Cr2(SO4)3 is named
chromium(II) sulfate.
b.
chromic sulfate.
dichromium trisulfate.
d.
chromium(III) sulfate.
a.
C.
3. In a polyatomic ion, the algebraic sum of the oxidation numbers of all
atoms is equal to
a.
0.
b.
10.
c.
the number of atoms in the ion
the charge on the ion.
4. The first part of the name of a binary ionic compound is the
cation
polyatomic ion

answer : (a) volume of the gas = 8.67 ×   l

                (b) second virial coefficient b = -1.21226 l/mole

solution :   given,     t = 300k

                                p = 20atm

                                z = 0.86

                                n = 8.2 mmoles = 8.2 × moles

                                r =   0.082 l atm/k/mol

        find,     (a) volume of gas   and (b) second virial coefficient b at 300k.

formula used :            

                          and            

(a)            

                    = \times 0.082\times 300}{20}[/tex]

                    = 8.67 ×   l

(b)      

                    = (0.00867-1) × 8.659

                    = - 8.5839 l/mole

nuclear fission produces elements that are heavier than helium.

the elements that are used in nuclear fission and their products are much heavier than helium.