Name _______________________
Date ________________________
Homework #1- Molecular Compounds and Ions
Completion
1. every substance is either an element or a(n) ___________________. A compound
is either __________________ or ionic in nature. Molecular compounds are
composed of two or more __________________.
2. The representative particle of a molecular compound is a _________________.
Ionic compounds are composed of oppositely charged _____________ combined in
electrically neutral groupings.
3. Molecular compounds tend to have _______________ melting and boiling points,
while ionic compounds tend to have _______________ melting and boiling points.
Ions form when atoms or groups of atoms ____________ or ___________
electrons.
True-False
(State whether each is true or false and give a justification below as to why or why not)
_____________4. An anion is any atom or group of atoms with a positive charge.
_____________ 5. For metallic ions, the name of the ion is the same as the name of the
element.
_____________ 6. For ions of nonmetals, the name of the ion is the same as the name
of the element.
_____________ 7. A molecule contains two atoms
Matching
(Match each description in Column B to the correct term in Column A)
Column A
___ 8. molecule
___ 9. molecular compounds
___ 10. ions
___ 11. cations
___ 12. anions
___ 13. ionic compounds
Column B
a. compounds composed of molecules
b. atoms or groups of atoms with a negative
charge
c. compounds composed of cations and anions
d. atoms or groups of atoms that have a positive
or negative charge
e. smallest electrically neutral unit of a
substance that retains the properties of the
substance
14. State the number of electrons lost or gained in forming each of these ions.
a. Mg2+ _________________
c. Br - ____________________
b. Ca2+ _________________
d. Ag+ ___________________
15. Name each ion and tell whether it is an anion or cation.
a. Mg2+ _________________
c. Br - ____________________
b. Ca2+ _________________
d. Ag+ ___________________
16. Classify each particle as an atom, cation, anion, or molecule.
a. Fe3+ _______________
f. O2- ________________
b. F-
g. Na+ ________________
_______________
c. CH4 _______________
h. He
________________
d. Ne
_______________
i. CO2 ________________
e. O2
_______________
j. Ca2+ ________________