Chapter 3 - Molecules and Compounds Quiz

An ionic bond is best described as

• the sharing of electrons.

• the transfer of electrons from one atom to another.

• the attraction that holds the atoms together in a polyatomic ion.

• the attraction between two nonmetal atoms.

• the attraction between two metal atoms.

A covalent bond is best described as

• the sharing of electrons between atoms.

• the transfer of electrons.

• a bond between a metal and a nonmetal.

• a bond between a metal and a polyatomic ion.

• a bond between two polyatomic ions.

Give a possible molecular formula for the empirical formula of C2H5N.

• C4H10N

• C5H10N2

• C4H10N2

• C6H15N

• C4H5N2

Give the name for CoCl2∙6H2O. Remember that Co forms several ions.

• cobalt chloride hydrate

• cobalt(I) chloride heptahydrate

• cobalt(II) chloride heptahydrate

• cobalt(II) chloride hexahydrate

• cobalt(I) chloride

Give the correct formula for aluminum sulfate.

• Al2SO4

• Al(SO4)3

• Al3(SO4)2

• Al2(SO4)3

• AlSO4

Calculate the molar mass of NaCl.

• 86.03 g/mol

• 204.13 g/mol

• 58.44 g/mol

• 258.09 g/mol

• 139.99 g/mol

How many molecules of N2O4 are in 76.3 g N2O4? The molar mass of N2O4 is 92.02 g/mol. Avogadro’s number is 6.022 x1023.

• 5.54 × 1025 N2O4 molecules

• 7.26 × 1023 N2O4 molecules

• 1.38 × 1024 N2O4 molecules

• 4.59 × 1025 N2O4 molecules

• 4.99 × 1023 N2O4 molecules

Calculate the mass percent composition of lithium in Li3PO4.

• 26.75%

• 17.98%

• 30.72%

• 55.27%

• 20.82%

Determine the empirical formula for a compound that produces 24.5 g nitrogen and 70.0 g oxygen.

• NO

• N2O

• NO2

• N2O5

• NO3

Which of the following is an ionic compound?

• S I2

• Ca F2

• Cl2O

• CH2O

• P F5