Form B
Midterm Exam 1
CHEM 2100
February 11, 2026
Please carefully read these instructions
« Please fill out your last name, first name, and student number on the student answer
sheet.
« There are 21 questions in total. You need to answer any 20 to get full credit.
+ You can write on the question set; however, it will not be graded.
= Calculators and cell phones are not allowed.
+ The periodic table and electronegativity table have been included at the end of the
question set.
e There is ZERO TOLERANCE FOR CHEATING.
Question type: Multiple Choice
1. The bonding pattern of oxygen with a formal charge of 1+ could be described as
A) two lone pairs of electrons and two single bonds
B) one lone pair of electrons and three single bonds g Th
C) three lone pairs of electrons, and one single bond = ? - i
one lone pair of electrons, one single, and one double bond £ her 0‘“ e
E) zero lone pairs, and two single and one double bond 1 Finc -
2. Which of the following Lewis structures is correct?
" H o H H g Ci:
’C=E_H L= b H-0=0-H
| 1 n v
AL
(B)11, 1T
C)I,1II
D) L, IV
E) IIT
, Form B
atom in each species.
3. Determine the electron geometry around the indicated
H 1081 =2
H-O-H
I
<
tetrahedral
A) 1= Tetrahedral; II = trigonal planar; 111 = linear; IV =
linear
B) I = Linear; 1= tetrahedral; III = trigonal planar; IV =
= trigonal planar
C) I = Trigonal planar; II = linear; IIT = tetrahedral; IV
= tetrahedral
I = Linear; II = tetrahedral; IIT = trigonal planar; IV
E) 1= Linear; Il = tetrahedral; III = tetrahedral; IV = tetrahedral
ures?
4. Which of the following are pairs of contributing struct
‘o CH; ..
I CHy > CHs - CHiY “OH
. o @
I CH,=0. = CH,=0:
@ ¢ L —i Er,—CH=CH,
CH,~=CH—CH,
0]
A) LTV
B) L, IL, IIT
1L, IV
D) IL, 111, IV
E) IL, III
ons?
5. Which element is most likely to lose its valence electr
A) Nitrogen
B) Bromine
Sodium
D) Neon
E) Hydrogen
Midterm Exam 1
CHEM 2100
February 11, 2026
Please carefully read these instructions
« Please fill out your last name, first name, and student number on the student answer
sheet.
« There are 21 questions in total. You need to answer any 20 to get full credit.
+ You can write on the question set; however, it will not be graded.
= Calculators and cell phones are not allowed.
+ The periodic table and electronegativity table have been included at the end of the
question set.
e There is ZERO TOLERANCE FOR CHEATING.
Question type: Multiple Choice
1. The bonding pattern of oxygen with a formal charge of 1+ could be described as
A) two lone pairs of electrons and two single bonds
B) one lone pair of electrons and three single bonds g Th
C) three lone pairs of electrons, and one single bond = ? - i
one lone pair of electrons, one single, and one double bond £ her 0‘“ e
E) zero lone pairs, and two single and one double bond 1 Finc -
2. Which of the following Lewis structures is correct?
" H o H H g Ci:
’C=E_H L= b H-0=0-H
| 1 n v
AL
(B)11, 1T
C)I,1II
D) L, IV
E) IIT
, Form B
atom in each species.
3. Determine the electron geometry around the indicated
H 1081 =2
H-O-H
I
<
tetrahedral
A) 1= Tetrahedral; II = trigonal planar; 111 = linear; IV =
linear
B) I = Linear; 1= tetrahedral; III = trigonal planar; IV =
= trigonal planar
C) I = Trigonal planar; II = linear; IIT = tetrahedral; IV
= tetrahedral
I = Linear; II = tetrahedral; IIT = trigonal planar; IV
E) 1= Linear; Il = tetrahedral; III = tetrahedral; IV = tetrahedral
ures?
4. Which of the following are pairs of contributing struct
‘o CH; ..
I CHy > CHs - CHiY “OH
. o @
I CH,=0. = CH,=0:
@ ¢ L —i Er,—CH=CH,
CH,~=CH—CH,
0]
A) LTV
B) L, IL, IIT
1L, IV
D) IL, 111, IV
E) IL, III
ons?
5. Which element is most likely to lose its valence electr
A) Nitrogen
B) Bromine
Sodium
D) Neon
E) Hydrogen
