Download Pre AP Chemistry Chapter 6: Bonding Homework #2

Pre AP Chemistry Chapter 7 & 8: Bonding Homework #2
1.
List three characteristics of ionic compounds. How do these characteristics differ from that of covalent
compounds?
2.
Why do ionic compounds conduct electricity when they are molten or dissolved, but they will not conduct
when in solid form?
3.
Of what kind of elements are ionic compounds composed?________________________
Covalent compounds?___________________________________
Metallic______________________________________________
4.
A
B
C
D
Identify the following compounds as ionic, covalent, or metallic
NaCl
E
H2O
CH4
F
Steel
NH3
G
CaCl2
Al2(Cr2O2)3
H
SO
5.
Compound B has a lower melting temperature than compound A. Compound A dissolves readily in water
and conducts electricity. Compound B has poor solubility and no conductivity. Which would be the most
likely to be a molecular (covalent ) compound? Explain.
6.
Decide whether the following element will gain or lose valence electrons in the process of ionization to
obtain an octet. State gain or lose and indicate the number of electrons that will change
a. strontium____________
b. nitrogen____________
c. zinc__________
d. bromine_____________
7.
Write the appropriate formula for the ion formed by the elements from question 8. Use a + or a minus sign
to indicate what charge the ion assume when electrons are gained or lost
a. strontium____________
b. nitrogen____________
c. zinc__________
d. bromine_____________
8.
9.
Write the appropriate electrically neutral Ionic formula formed when the following ions bond with each
other.
a. sodium and selenium________________________________________
b.
tin(II) and chlorine___________________________________________
c.
tin(IV) and oxygen___________________________________
Why do ionic compounds break when they are struck? Why do metallic compounds bend rather than
break? (See figure 7.12 on page221 of your textbook) Explain.
10. Determine the electronegativity difference between the following pairs of atoms. Predict the most likely
type of bond that would form between the two atoms. See electronegativity chart on page 191 of textbook.
a. Silicon and oxygen
b.
Hydrogen and oxygen
c.
Sodium and fluorine
11. Generalize: the larger the difference in electronegativity the more likely that the bond is a(n)__________
bond.
12. Water is a polar molecule in which one atom has more attraction for the shared electrons. Which atom is
most likely the atom that has the greatest attractivity for the electrons?____________ Why?