Name ________________
Molecule-Ion Attractions
1. Which diagram best illustrates the ion-molecule attractions that occur when the ions of NaCl(s) are added to
water?
1)
2)
3)
4)
2. Which represents a sample containing molecule-ion attractions?
1) CH 4(g)
2) NaCl(aq)
3) H2O(g)
4) Hg(l)
3. Which diagram best illustrates the hydration of sodium ions in an aqueous solution? [The diagrams are not
drawn to scale.]
1)
2)
3)
4)
4. When NaCl(s) is dissolved in H2O( ), the sodium ion is attracted to the water molecule's
1) negative end, which is hydrogen
3) positive end, which is hydrogen
2) negative end, which is oxygen
4) positive end, which is oxygen
5. When a salt is dissolved in water, the salt particles exist in the form of
1)
2)
3)
4)
hydrated molecules, only
hydrated ions, only
both hydrated ions and hydrated molecules
neither hydrated ions nor hydrated molecules
6. In an aqueous solution of an ionic salt, the oxygen atom of the water molecule is attracted to the
1)
2)
3)
4)
negative ion of the salt, due to oxygen's partial positive charge
negative ion of the salt, due to oxygen's partial negative charge
positive ion of the salt, due to oxygen's partial positive charge
positive ion of the salt, due to oxygen's partial negative charge
7. When calcium chloride is dissolved in water, to which end of the adjacent water molecules will a calcium
ion be attracted?
1)
2)
3)
4)
the oxygen end, which is the negative pole
the oxygen end, which is the positive pole
the hydrogen end, which is the negative pole
the hydrogen end, which is the positive pole
8. Solid Potassium Chloride will most likely dissolve in
1) CCl4( ), which is a nonpolar solvent
3) H2O( ), which is a nonpolar solvent
2) CCl4( ), which is a polar solvent
4) H 2O( ), which is a polar solvent
9. In which system do molecule-ion attractions exist?
1) KCl(s)
2) KCl(aq)
3) KCl( )
4) KCl(g)
Molecule-Ion Attractions
10. Potassium chloride dissolved in pure water is an example of
1)
2)
3)
4)
an ionic compound dissolved in a polar solvent
an ionic compound dissolved in a nonpolar solvent
a covalent compound dissolved in a polar solvent
a covalent compound dissolved in a nonpolar solvent
Answer Key
Molecule-Ion Attractions
1.
1
2.
2
3.
2
4.
2
5.
2
6.
4
7.
1
8.
4
9.
2
10.
1