The document outlines an exam taken in a chemistry course, providing the exam questions, the student's answers, and whether each answer was correct or incorrect. The exam covered topics like classifying elements, writing chemical formulas, and defining common chemistry terms. The student's score was 69.5% overall after completing the multiple choice and short answer exam questions.

1. Home / My Courses / 21SPE CHEM-1123-EW02S / Unit 2 Materials / Unit 2 Exam
Started on Wednesday, 3 February 2021, 9:28 PM
State Finished
Completed on Wednesday, 3 February 2021, 11:18 PM
Time taken 1 hour 50 mins
Grade 69.50 out of 100.00
Question 1
Correct Mark 1.00 out of 1.00
Question 2
Correct Mark 2.00 out of 2.00
Platinum (Z=78) is classified as a/an
Select one:
a. representative element.
b. transition metal. 
c. none of these.
d. lanthanide.
e. actinide.
The correct answer is: transition metal.
The bond between carbon and fluorine would be described as
Select one:
ionic.
nonpolar covalent.
polar covalent. 
ephemeral.
Your answer is correct.
The correct answer is: polar covalent.

2. Question 3
Incorrect Mark 0.00 out of 2.00
Question 4
Correct Mark 1.00 out of 1.00
Question 5
Incorrect Mark 0.00 out of 1.00
Write the formula for the compound expected when sulfur reacts with aluminum.
No special formatting of your answer is required - all numbers will be assumed to
be subscripts. For example, water would be entered as H2O.
Answer: Al6S3 
The correct answer is: Al2S3
Praeseodymium (Z=59) is classified as a/an
Select one:
a. actinide.
b. lanthanide. 
c. representative element.
d. none of these.
e. transition metal.
The correct answer is: lanthanide.
Mercury (Z=80) is a
Select one:
a. nonmetal.
b. metalloid 
c. none of these.
d. metal.
The correct answer is: metal.

3. Question 6
Correct Mark 2.00 out of 2.00
Question 7
Correct Mark 1.00 out of 1.00
Question 8
Correct Mark 2.00 out of 2.00
Question 9
Incorrect Mark 0.00 out of 2.00
Enter the correct formula for lead(IV) sulfate. No special formatting required -- all
numbers will be considered subscripts (H2O = water).
Answer: Pb(SO4)2 
The correct answer is: Pb(SO4)2
Name the ion formed by a single atom of bromine.
Answer: Bromide 
The correct answer is: bromide ion
Give the correctly spelled name of Sr(NO ) . Strontium nitrate 
3 2
Give the correctly spelled name of FeBr . Ferric bromide 
3
Comment:
This naming method was not taught. You need to follow what was taught in the lecture.

4. Question 10
Partially correct Mark 2.00 out of 3.00
Question 11
Correct Mark 3.00 out of 3.00
Question 12
Correct Mark 2.00 out of 2.00
Question 13
Partially correct Mark 1.50 out of 2.00
Fill in the information for Cu
number of protons 29 
number of electrons 27 
number of neutrons 36 
65
Fill in the information for Ba
number of protons 56 
number of electrons 56 
number of neutrons 81 
137
Give the correctly spelled name of Cu (PO ) . Copper(II) phosphate 
3 4 2
How many atoms or ions of each element are present in Cr(H PO ) ? Fill in the blanks below with the
correct numbers.
Cr 3  H 6  P 3  O 12 
2 4 3

5. Question 14
Correct Mark 2.00 out of 2.00
Question 15
Correct Mark 1.00 out of 1.00
Enter the correct formula for aluminum carbonate. No special formatting required -
- all numbers will be considered subscripts (H2O = water).
Answer: Al2(CO3)3 
The correct answer is: Al2(CO3)3
Tantalum (Z=73) is classified as a/an
Select one:
a. representative element.
b. actinide.
c. transition metal. 
d. lanthanide.
e. none of these.
The correct answer is: transition metal.

6. Question 16
Correct Mark 1.00 out of 1.00
Question 17
Correct Mark 1.00 out of 1.00
A group of atoms with a net electrical charge. NH and SO would be examples.
Select one:
anion
atomic mass
atomic mass unit
atomic number
cation
electron
energy levels
isotope
mass number
neutron
octet rule
polyatomic ion 
proton
valence electrons
4
+
4
2−
The correct answer is: polyatomic ion
Cadmium (Z=48) is classified as a/an
Select one:
a. none of these.
b. lanthanide.
c. representative element.
d. transition metal. 
e. actinide.
The correct answer is: transition metal.

7. Question 18
Correct Mark 1.00 out of 1.00
Question 19
Correct Mark 1.00 out of 1.00
The sum of the numbers of protons and neutrons in the nucleus of an atom.
Select one:
anion
atomic mass
atomic mass unit
atomic number
cation
electron
energy levels
isotope
mass number 
neutron
octet rule
polyatomic ion
proton
valence electrons
The correct answer is: mass number
The electrons in the outermost shell of an atom.
Select one:
anion
atomic mass
atomic mass unit
atomic number
cation
electron
energy levels
isotope
mass number
neutron
octet rule
polyatomic ion
proton
valence electrons 
The correct answer is: valence electrons

8. Question 20
Correct Mark 2.00 out of 2.00
Question 21
Incorrect Mark 0.00 out of 1.00
Enter the correct formula for phosphorus pentachloride. No special formatting
required -- all numbers will be considered subscripts (H2O = water).
Answer: PCl5 
The correct answer is: PCl5
Cobalt (Z=27) is a
Select one:
a. none of these. 
b. metal.
c. metalloid
d. nonmetal.
The correct answer is: metal.

9. Question 22
Correct Mark 1.00 out of 1.00
The average mass of an element that takes into account the masses of isotopes
and their relative abundances in naturally occurring samples.
Select one:
anion
atomic mass 
atomic mass unit
atomic number
cation
electron
energy levels
isotope
mass number
neutron
octet rule
polyatomic ion
proton
valence electrons
The correct answer is: atomic mass

10. Question 23
Correct Mark 1.00 out of 1.00
What is the correct Lewis symbol for sulfur (Z=16)?
Select one:
a.
b.
c.
d.
e. 
Your answer is correct.
The correct answer is:

11. Question 24
Correct Mark 1.00 out of 1.00
Question 25
Correct Mark 2.00 out of 2.00
Chloride ion would be an example.
Select one:
anion 
atomic mass
atomic mass unit
atomic number
cation
electron
energy levels
isotope
mass number
neutron
octet rule
polyatomic ion
proton
valence electrons
The correct answer is: anion
Enter the correct formula for dinitrogen trioxide. No special formatting required --
all numbers will be considered subscripts (H2O = water).
Answer: N2O3 
The correct answer is: N2O3

12. Question 26
Correct Mark 2.00 out of 2.00
Question 27
Correct Mark 1.00 out of 1.00
Question 28
Correct Mark 1.00 out of 1.00
Select the best use of fluorine (or fluoride) in the body.

Select the best dietary source of fluorine (or fluoride). 
hardens tooth enamel
sh
Your answer is correct.
The correct answer is:
Select the best use of fluorine (or fluoride) in the body. [hardens tooth enamel]
Select the best dietary source of fluorine (or fluoride). [fish]
Plutonium (Z=94) is classified as a/an
Select one:
a. representative element.
b. lanthanide.
c. transition metal.
d. none of these.
e. actinide. 
The correct answer is: actinide.
Berkelium (Z=97) is classified as a/an
Select one:
a. actinide. 
b. representative element.
c. lanthanide.
d. none of these.
e. transition metal.
The correct answer is: actinide.

13. Question 29
Complete Mark 2.00 out of 4.00
Question 30
Correct Mark 2.00 out of 2.00
On a sheet of paper, draw a Lewis structure for a molecule of SCl (sulfur and two
chlorine atoms). Covalent bonds must be shown as lines in your final answer.
Circle your final answer or put a box around it. Create a PDF of your work and final
answer and attach it to this question as you did with the upload practice exercise
or upload it to the "Work for Unit 2 Exam" drop box immediately after you finish
the test.
see upload
2
Comment:
You need to use lines to show covalent bonds
Give the correctly spelled name of KHCO . Potassium hydrogen carbonate 
3

14. Question 31
Correct Mark 1.00 out of 1.00
Question 32
Incorrect Mark 0.00 out of 1.00
An atom that loses one or more electrons becomes one of these.
Select one:
anion
atomic mass
atomic mass unit
atomic number
cation 
electron
energy levels
isotope
mass number
neutron
octet rule
polyatomic ion
proton
valence electrons
The correct answer is: cation
Neodymium (Z=60) is a
Select one:
a. none of these. 
b. nonmetal.
c. metalloid
d. metal.
The correct answer is: metal.

15. Question 33
Correct Mark 1.00 out of 1.00
Question 34
Incorrect Mark 0.00 out of 1.00
An atom of an element that differs from an atom of the same element only in the
number of neutrons in its nucleus.
Select one:
anion
atomic mass
atomic mass unit
atomic number
cation
electron
energy levels
isotope 
mass number
neutron
octet rule
polyatomic ion
proton
valence electrons
The correct answer is: isotope
Name the ion formed by a single atom of iodine.
Answer: iodides 
The correct answer is: iodide ion

16. Question 35
Correct Mark 2.00 out of 2.00
Question 36
Correct Mark 2.00 out of 2.00
Question 37
Correct Mark 1.00 out of 1.00
Enter the correct formula for aluminum sulfate. No special formatting required --
all numbers will be considered subscripts (H2O = water).
Answer: Al2(SO4)3 
The correct answer is: Al2(SO4)3
Write the formula for the compound expected when calcium reacts with
phosphorus. No special formatting of your answer is required - all numbers will be
assumed to be subscripts. For example, water would be entered as H2O.
Answer: Ca3P2 
The correct answer is: Ca3P2
Name the ion formed by a single atom of nitrogen.
Answer: nitride ion 
The correct answer is: nitride ion

17. Question 38
Correct Mark 1.00 out of 1.00
Question 39
Correct Mark 1.00 out of 1.00
Question 40
Incorrect Mark 0.00 out of 2.00
Neptunium (Z=93) is classified as a/an
Select one:
a. alkali metal.
b. alkaline earth metal.
c. noble gas.
d. none of these. 
e. halogen.
The correct answer is: none of these.
Strontium (Z=38) is a
Select one:
a. none of these.
b. metalloid
c. nonmetal.
d. metal. 
The correct answer is: metal.
Give the correctly spelled name of Al (SO ) . Aluminium sulfate 
2 4 3

18. Question 41
Correct Mark 3.00 out of 3.00
Question 42
Correct Mark 1.00 out of 1.00
Fill in the information for Xe
number of protons 54 
number of electrons 54 
number of neutrons 76 
130
Selenium (Z=34) is a
Select one:
a. metalloid
b. nonmetal. 
c. metal.
d. none of these.
The correct answer is: nonmetal.

19. Question 43
Correct Mark 1.00 out of 1.00
Question 44
Partially correct Mark 2.00 out of 3.00
Equivalent to 1/12th the mass of a carbon-12 atom or about 1.66 x 10 grams.
Select one:
anion
atomic mass
atomic mass unit 
atomic number
cation
electron
energy levels
isotope
mass number
neutron
octet rule
polyatomic ion
proton
valence electrons
−24
The correct answer is: atomic mass unit
Fill in the information for I
number of protons 53 
number of electrons 54 
number of neutrons 78 
131

20. Question 45
Incorrect Mark 0.00 out of 2.00
Question 46
Incorrect Mark 0.00 out of 1.00
The bond between silicon (Si) and hydrogen would be described as
Select one:
nonpolar covalent.
ephemeral.
polar covalent. 
ionic.
Your answer is incorrect.
The correct answer is: nonpolar covalent.
A subatomic particle with a mass of 9.1 x 10 g and a charge of −1, and that can
be found in an orbital.
Select one:
anion
atomic mass 
atomic mass unit
atomic number
cation
electron
energy levels
isotope
mass number
neutron
octet rule
polyatomic ion
proton
valence electrons
−28
The correct answer is: electron

21. Question 47
Correct Mark 1.00 out of 1.00
Question 48
Correct Mark 1.00 out of 1.00
Question 49
Correct Mark 1.00 out of 1.00
Arsenic (Z=33) is a
Select one:
a. metal.
b. none of these.
c. nonmetal.
d. metalloid. 
The correct answer is: metalloid.
Chlorine (Z=17) is classified as a/an
Select one:
a. noble gas.
b. alkali metal.
c. none of these.
d. alkaline earth metal.
e. halogen. 
The correct answer is: halogen.
Rubidium (Z=37} is classified as a/an
Select one:
a. halogen.
b. none of these.
c. alkaline earth metal.
d. alkali metal. 
e. noble gas.
The correct answer is: alkali metal.

22. Question 50
Correct Mark 2.00 out of 2.00
Enter the correct formula for lead(IV) sulfite. No special formatting required -- all
numbers will be considered subscripts (H2O = water).
Answer: Pb(SO3)2 
The correct answer is: Pb(SO3)2

23. Question 51
Not answered Marked out of 4.00
Dosage problem: The antibiotic Cefobid is delivered by intramuscular injection
(IM). It comes in a vial containing dry powder that is reconstituted by adding 3.80
mL of sterile water. The resulting Cefobid solution contains 333 mg in each 1.00
mL of solution. If the order is for a patient to receive a 500. mg dose of Cefobid,
how much of the Cefobid solution do you draw into your syringe? In the grid
below, use the menus to show the most logical dimensional analysis set-up for the
calculation. Select the best answer from the answer menu. (You may not need all
the numbers given in the problem. It might work best if you set up the calculation
on paper first, then select the menu items to match your set-up.)
=
Your answer is incorrect.
The correct answer is:
Dosage problem: The antibiotic Cefobid is delivered by intramuscular injection (IM). It comes in a
vial containing dry powder that is reconstituted by adding 3.80 mL of sterile water. The resulting
Cefobid solution contains 333 mg in each 1.00 mL of solution. If the order is for a patient to receive a
500. mg dose of Cefobid, how much of the Cefobid solution do you draw into your syringe? In the grid
below, use the menus to show the most logical dimensional analysis set-up for the calculation. Select
the best answer from the answer menu. (You may not need all the numbers given in the problem. It
might work best if you set up the calculation on paper first, then select the menu items to match your
set-up.)
[500. mg Cefobid] [1.00 mL]
[333 mg Cefobid]
= [1.50 mL]

24. Question 52
Correct Mark 2.00 out of 2.00
Question 53
Incorrect Mark 0.00 out of 1.00
Give the correctly spelled name of KOH. potassium hydroxide 
What is the best Lewis symbol for carbon (Z=6)?
Select one:
a. 
b.
c.
d.
e.
Your answer is incorrect.
The correct answer is:

25. Question 54
Correct Mark 1.00 out of 1.00
Question 55
Correct Mark 1.00 out of 1.00
Calcium (Z=20) is classified as a/an
Select one:
a. none of these.
b. halogen.
c. noble gas.
d. alkaline earth metal. 
e. alkali metal.
The correct answer is: alkaline earth metal.
Sodium (Z=11) is classified as a/an
Select one:
a. halogen.
b. noble gas.
c. alkaline earth metal.
d. none of these.
e. alkali metal. 
The correct answer is: alkali metal.

26. Question 56
Incorrect Mark 0.00 out of 2.00
Question 57
Correct Mark 1.00 out of 1.00
The bond between beryllium (Be) and chlorine would be described as
Select one:
polar covalent.
nonpolar covalent.
ephemeral.
ionic.  The difference in
electronegativities is only
1.59.
Your answer is incorrect.
The correct answer is: polar covalent.
Name the ion formed by a single atom of chlorine.
Answer: chloride ion 
The correct answer is: chloride ion

27. Question 58
Not answered Marked out of 6.00
Convert 9.75 x 10 mg to pounds using 1 lb = 453.6 g as a conversion factor along
with any metric-to-metric relationships you know and might need. In the grid
below, use the menus to show the most logical dimensional analysis set-up for the
calculation. Select the best answer from the answer menu. (You may not need all
the numbers given in the problem. It might work best if you set up the calculation
on paper first, then select the menu items to match your set-up.)
=
2
Your answer is incorrect.
The correct answer is:
Convert 9.75 x 10 mg to pounds using 1 lb = 453.6 g as a conversion factor along with any metric-to-
metric relationships you know and might need. In the grid below, use the menus to show the most
logical dimensional analysis set-up for the calculation. Select the best answer from the answer menu.
(You may not need all the numbers given in the problem. It might work best if you set up the
calculation on paper first, then select the menu items to match your set-up.)
[9.75 x 10² mg] [1 g] [1 lb]
[1000 mg] [453.6 g]
= [2.15 x 10⁻³ lb]
2

28. Question 59
Correct Mark 1.00 out of 1.00
Question 60
Correct Mark 1.00 out of 1.00
A subatomic particle with a mass of 1.008 amu and no electrical charge.
Select one:
anion
atomic mass
atomic mass unit
atomic number
cation
electron
energy levels
isotope
mass number
neutron 
octet rule
polyatomic ion
proton
valence electrons
The correct answer is: neutron
Neon (Z=10) is classified as a/an
Select one:
a. alkali metal.
b. noble gas. 
c. alkaline earth metal.
d. halogen.
e. none of these.
The correct answer is: noble gas.

29. Question 61
Correct Mark 2.00 out of 2.00
Write the formula for the compound expected when oxygen reacts with calcium.
No special formatting of your answer is required - all numbers will be assumed to
be subscripts. For example, water would be entered as H2O.
Answer: CaO 
The correct answer is: CaO