CHEM121 QUIZ 5,6,7 AND ITS
COMPLETE SOLUTIONS
How many nonbonding pairs of electrons are present
in the lewis dot structure of a molecule with formula
AX2? A has 4 valence electrons while each X has 7.
6
What is the shape of a molecule which has the formula
AX3? A has 6 valence electrons as does each X.
trigonal planar
What is the shape of a molecule which has the formula
AX2-1? A has 3 valence electrons while each X has 6.
linear
What is the shape of a molecule which has the formula
AX3? A has 5 valence electrons while X has 7.
trigonal pyramidal
What is the shape of a molecule which has the formula
AX4 -2? A has 4 valence electrons while each X has 6.
tetrahedral
How many valence electrons does potassium have?
1
Does the nitrate ion have polar or nonpolar bonds?
polar
Does the sulfate ion have polar or nonpolar bonds?
polar
Is carbon tetrahydride a polar or nonpolar molecule?
nonpolar
Is carbon dioxide a polar or nonpolar molecule?
nonpolar
, How many valence electrons are present in the sulfite
ion?
26
How many valence electrons are present in the sulfite
ion?
10
Which of the following best describes HCF3?
there are polar and nonpolar bonds in the molecule
How many single bonds does AsO4-3 have?
4
How many single bonds does the phosphate ion
have?
4
Does Cl2 have polar or nonpolar bonds?
non polar
What is the molar mass of platinum (I) sulfate? How
many grams of platinum (I) sulfate are present in a
0.32 mole sample?
486.23 g/mole
160 moles
What is the molar mass of platinum (IV) sulfate? How
many grams of platinum (IV) sulfate are present in a
0.32 mole sample?
387.22 g/mol
120 moles
How many formula units of lithium bromide are
present in a 2.9 mole sample?
1.7 x 10^24 formula units
How many molecules of pentaphosphorus
decafluoride are present in an 2.1 mole sample?
1.3x10^24 molecules
COMPLETE SOLUTIONS
How many nonbonding pairs of electrons are present
in the lewis dot structure of a molecule with formula
AX2? A has 4 valence electrons while each X has 7.
6
What is the shape of a molecule which has the formula
AX3? A has 6 valence electrons as does each X.
trigonal planar
What is the shape of a molecule which has the formula
AX2-1? A has 3 valence electrons while each X has 6.
linear
What is the shape of a molecule which has the formula
AX3? A has 5 valence electrons while X has 7.
trigonal pyramidal
What is the shape of a molecule which has the formula
AX4 -2? A has 4 valence electrons while each X has 6.
tetrahedral
How many valence electrons does potassium have?
1
Does the nitrate ion have polar or nonpolar bonds?
polar
Does the sulfate ion have polar or nonpolar bonds?
polar
Is carbon tetrahydride a polar or nonpolar molecule?
nonpolar
Is carbon dioxide a polar or nonpolar molecule?
nonpolar
, How many valence electrons are present in the sulfite
ion?
26
How many valence electrons are present in the sulfite
ion?
10
Which of the following best describes HCF3?
there are polar and nonpolar bonds in the molecule
How many single bonds does AsO4-3 have?
4
How many single bonds does the phosphate ion
have?
4
Does Cl2 have polar or nonpolar bonds?
non polar
What is the molar mass of platinum (I) sulfate? How
many grams of platinum (I) sulfate are present in a
0.32 mole sample?
486.23 g/mole
160 moles
What is the molar mass of platinum (IV) sulfate? How
many grams of platinum (IV) sulfate are present in a
0.32 mole sample?
387.22 g/mol
120 moles
How many formula units of lithium bromide are
present in a 2.9 mole sample?
1.7 x 10^24 formula units
How many molecules of pentaphosphorus
decafluoride are present in an 2.1 mole sample?
1.3x10^24 molecules
