WGU D425 Introduction to Chemistry All Combined
Verified Multiple Choice and Conceptual Actual
Emended Exam Questions With Reviewed 100%
Correct Detailed Answers
Guaranteed Pass!!Current Update
1. Which molecule is polar?
- ANSWER SO2
2. Which molecule is nonpolar?
- ANSWER CCl4
3. Which of the covalent single bonds is the most polar? The electronegativity
values are provided below.
O–N
C–H
N–C
O–C
- ANSWER O-C
4. What is the bond angle between atoms in a trigonal planar geometry?
90°
109.5°
180°
, - ANSWER 120°
5. Which compound contains only covalent bonds?
MgSO4
NaCl
Ca3(PO4)2
HC2H3O2
- ANSWER HC2H3O2
6. A single atom of hydrogen has a mass of about _________ grams
- ANSWER 1.67 × 10^24
7. A____________ is defined as the number of atoms contained in exactly 12
grams of carbon-12 (the isotope). Chemists have measured this number,
and it turns out to be 6.0221415 × 1023.
- ANSWER mole
8. the behavior of gases, he suggested that equal volumes of all gases at the
same temperature and pressure contain the same number of molecules.
This statement is referred to as ____________.
- ANSWER Avogadro's hypothesis
9. __________ (this is rounded to 6.02 × 10^23 for most calculations).
Because a mole can be thought of as a number, you can convert any
number to moles by dividing that number by 6.02 × 10^23.
- ANSWER Avogadro's number
,10.How many atoms are in 14 moles of cadmium (Cd)?
8.4 × 1023 atoms Cd
2.3 × 1023 atoms Cd
8.4 atoms Cd
8.4 × 10^24 atoms Cd
- ANSWER 8.4 × 10^24 atoms Cd
11.How many moles are in 4.3 x 1022 molecules of H3PO4? You may use the
calculator on your computer to complete this calculation.
3.4 × 1022 moles H3PO4
7.1 × 102 moles H3PO4
4.3 × 1022 moles H3PO4
7.1 × 10^-2 moles H3PO4
- ANSWER 7.1 × 10^-2 moles H3PO4
12.____________ is defined as the mass in grams of one mole of a substance.
The units of molar mass are grams per mole, abbreviated as g/mol.
- ANSWER Molar mass
13.The ___________ of an element is the relative average of all of the naturally
occurring isotopes of that element. __________ is the number that appears
in the periodic table.
- ANSWER atomic mass
, 14.A mole is defined based on the isotopic atomic mass of ____________. By
definition, the molar mass of carbon-12 is numerically the same, and is,
therefore, exactly 12 grams.
- ANSWER carbon-12
15. For compounds that are not molecular (ionic compounds), it is improper to
use the term molecular mass. ____________ is generally substituted. This is
because there are no individual molecules in ionic compounds. However, when
talking about a mole of an ionic compound, you will still use the term molar mass
- ANSWER Formula mass
16.What is the molar mass for C6H12O6?
196 g/mol
164 g/mol
148 g/mol
180.2 g/mol
- ANSWER 180.2 g/mol
17. What is the molar mass for Mg(OH)2?
74.31 g/mol
42.32 g/mol
26.32 g/mol
58.32 g/mol
- ANSWER 58.32 g/mol
Verified Multiple Choice and Conceptual Actual
Emended Exam Questions With Reviewed 100%
Correct Detailed Answers
Guaranteed Pass!!Current Update
1. Which molecule is polar?
- ANSWER SO2
2. Which molecule is nonpolar?
- ANSWER CCl4
3. Which of the covalent single bonds is the most polar? The electronegativity
values are provided below.
O–N
C–H
N–C
O–C
- ANSWER O-C
4. What is the bond angle between atoms in a trigonal planar geometry?
90°
109.5°
180°
, - ANSWER 120°
5. Which compound contains only covalent bonds?
MgSO4
NaCl
Ca3(PO4)2
HC2H3O2
- ANSWER HC2H3O2
6. A single atom of hydrogen has a mass of about _________ grams
- ANSWER 1.67 × 10^24
7. A____________ is defined as the number of atoms contained in exactly 12
grams of carbon-12 (the isotope). Chemists have measured this number,
and it turns out to be 6.0221415 × 1023.
- ANSWER mole
8. the behavior of gases, he suggested that equal volumes of all gases at the
same temperature and pressure contain the same number of molecules.
This statement is referred to as ____________.
- ANSWER Avogadro's hypothesis
9. __________ (this is rounded to 6.02 × 10^23 for most calculations).
Because a mole can be thought of as a number, you can convert any
number to moles by dividing that number by 6.02 × 10^23.
- ANSWER Avogadro's number
,10.How many atoms are in 14 moles of cadmium (Cd)?
8.4 × 1023 atoms Cd
2.3 × 1023 atoms Cd
8.4 atoms Cd
8.4 × 10^24 atoms Cd
- ANSWER 8.4 × 10^24 atoms Cd
11.How many moles are in 4.3 x 1022 molecules of H3PO4? You may use the
calculator on your computer to complete this calculation.
3.4 × 1022 moles H3PO4
7.1 × 102 moles H3PO4
4.3 × 1022 moles H3PO4
7.1 × 10^-2 moles H3PO4
- ANSWER 7.1 × 10^-2 moles H3PO4
12.____________ is defined as the mass in grams of one mole of a substance.
The units of molar mass are grams per mole, abbreviated as g/mol.
- ANSWER Molar mass
13.The ___________ of an element is the relative average of all of the naturally
occurring isotopes of that element. __________ is the number that appears
in the periodic table.
- ANSWER atomic mass
, 14.A mole is defined based on the isotopic atomic mass of ____________. By
definition, the molar mass of carbon-12 is numerically the same, and is,
therefore, exactly 12 grams.
- ANSWER carbon-12
15. For compounds that are not molecular (ionic compounds), it is improper to
use the term molecular mass. ____________ is generally substituted. This is
because there are no individual molecules in ionic compounds. However, when
talking about a mole of an ionic compound, you will still use the term molar mass
- ANSWER Formula mass
16.What is the molar mass for C6H12O6?
196 g/mol
164 g/mol
148 g/mol
180.2 g/mol
- ANSWER 180.2 g/mol
17. What is the molar mass for Mg(OH)2?
74.31 g/mol
42.32 g/mol
26.32 g/mol
58.32 g/mol
- ANSWER 58.32 g/mol
