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WGU D425 EXAM ACTUAL EXAM QUESTIONS AND
CORRECT DETAILED ANSWERS (VERIFIED ANSWERS)
ALL ANSWERED {150 Q & A} ALREADY GRADED A+ /
D425 INTRODUCTION TO CHEMISTRY -PA AND OA |
GUARANTEED PASS
Term (aq) stands for aqueous.
What is the name of the following acid: HF(aq)
Hydrofluoric acid. Prefix hydro is placed in front of the nonmetal
with a name that ends in -ic. If HF were in a gaseous state, the name
of the acid would be hydrogen fluoride. The element name is used to
name the cation, and the name of the anion ends with ide
What is the correct name for cah2
Calcium hydride. Name of the metal is written as it is, and the name
of the nonmetal ends with -ide
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Which compound would you expect to be ionic
H2S
CO2
NH3
Srcl2
Srcl2. Ionic compounds have ionic bonds, ionic bonds involve a
metal Sr and a nonmetal Cl
What is the correct name for a molecule of SO3
Sulfur trioxide
What is the correct name for Cl2O7
Dichlorine heptoxide
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What is the charge of the ion formed by calcium (Ca)
+2. Calcium is a metal in group 2. Metal in group 2 lose 2 electron
because this would allow them to have 8 electrons(octet) in their
outermost shell
What is the correct name for HCIO4
Perchloric acid. CIO4- polyatomic ion is present, and since the
problem involves an acid, chlorate changes to chloric
What is the approximate bond angle btwn the atoms in a molecule with a
tetrahedral electron pair geometry?
109.5' tetrahedral bond angle based on VSEPR theory. This angle is
obtained when all 4 pairs of outer electrons repel each other equally.
What is the molecular geometry of CH2O
Trigonal planar. 3 groups of atoms or 3 bonded groups and zero lone
pairs around the central atom (carbon). VSEPR suggest that
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molecules with 3 groups around the central atom have trigonal
planar geometry. Bond angle 120'
Which atom is the most electronegative: P, Li, Cs, Cl?
Cl. Electronegativity increases as you move to the right of the
periodic table and as you move down a group.
What is the correct name for a molecular unit of H2O
Dihydrogen monoxide
What is the bond angle btwn 2 atoms in a trigonal planar geometry
120 degrees angle bond
WGU D425 EXAM ACTUAL EXAM QUESTIONS AND
CORRECT DETAILED ANSWERS (VERIFIED ANSWERS)
ALL ANSWERED {150 Q & A} ALREADY GRADED A+ /
D425 INTRODUCTION TO CHEMISTRY -PA AND OA |
GUARANTEED PASS
Term (aq) stands for aqueous.
What is the name of the following acid: HF(aq)
Hydrofluoric acid. Prefix hydro is placed in front of the nonmetal
with a name that ends in -ic. If HF were in a gaseous state, the name
of the acid would be hydrogen fluoride. The element name is used to
name the cation, and the name of the anion ends with ide
What is the correct name for cah2
Calcium hydride. Name of the metal is written as it is, and the name
of the nonmetal ends with -ide
,2 | Page
Which compound would you expect to be ionic
H2S
CO2
NH3
Srcl2
Srcl2. Ionic compounds have ionic bonds, ionic bonds involve a
metal Sr and a nonmetal Cl
What is the correct name for a molecule of SO3
Sulfur trioxide
What is the correct name for Cl2O7
Dichlorine heptoxide
,3 | Page
What is the charge of the ion formed by calcium (Ca)
+2. Calcium is a metal in group 2. Metal in group 2 lose 2 electron
because this would allow them to have 8 electrons(octet) in their
outermost shell
What is the correct name for HCIO4
Perchloric acid. CIO4- polyatomic ion is present, and since the
problem involves an acid, chlorate changes to chloric
What is the approximate bond angle btwn the atoms in a molecule with a
tetrahedral electron pair geometry?
109.5' tetrahedral bond angle based on VSEPR theory. This angle is
obtained when all 4 pairs of outer electrons repel each other equally.
What is the molecular geometry of CH2O
Trigonal planar. 3 groups of atoms or 3 bonded groups and zero lone
pairs around the central atom (carbon). VSEPR suggest that
, 4 | Page
molecules with 3 groups around the central atom have trigonal
planar geometry. Bond angle 120'
Which atom is the most electronegative: P, Li, Cs, Cl?
Cl. Electronegativity increases as you move to the right of the
periodic table and as you move down a group.
What is the correct name for a molecular unit of H2O
Dihydrogen monoxide
What is the bond angle btwn 2 atoms in a trigonal planar geometry
120 degrees angle bond
