Portage Learning CHEM 210 Final Exam 1
Practice Questions And Correct Answers
(Verified Answers) Plus Rationales 2025
Q&A | Instant Download PDF
1. What is the molar mass of calcium nitrate, Ca(NO₃)₂?
A. 102.09 g/mol
B. 164.10 g/mol
C. 118.09 g/mol
D. 85.07 g/mol
Calcium = 40.08, N = 14.01×2, O = 16.00×6; total = 164.10 g/mol.
2. Which of the following is a strong acid?
A. H₂CO₃
B. HCl
C. CH₃COOH
,D. NH₃
HCl is a strong acid because it completely ionizes in water.
3. What is the pH of a solution with [H⁺] = 1.0 x 10⁻⁴ M?
A. 3
B. 5
C. 4
D. 6
pH = -log[H⁺] = -log(1.0 x 10⁻⁴) = 4.
4. Which orbital is the last to fill for the element iron (Fe)?
A. 3d
B. 4p
C. 4s
D. 3p
Iron (atomic number 26) fills 4s before 3d, but 3d is the last to be filled in
the electron configuration.
5. Which of the following compounds is ionic?
A. NaCl
B. CO₂
C. CH₄
,D. NH₃
Ionic compounds form between metals and nonmetals; NaCl is made of
sodium (metal) and chlorine (nonmetal).
6. What is the percent composition of oxygen in H₂O?
A. 50%
B. 88.8%
C. 11.2%
D. 66.6%
O = 16, H₂ = 2. Total = 18. O% = (16/18)×100 ≈ 88.8%.
7. What type of bond involves the sharing of electrons?
A. Ionic
B. Covalent
C. Metallic
D. Hydrogen
Covalent bonds involve the sharing of electron pairs between atoms.
8. Which molecule has a trigonal planar shape?
A. CH₄
B. BF₃
C. H₂O
, D. NH₃
BF₃ has three regions of electron density around boron and no lone pairs,
giving it a trigonal planar shape.
9. What is the oxidation number of sulfur in H₂SO₄?
A. +4
B. +3
C. +6
D. 0
H is +1, O is -2. Let S = x: 2(+1) + x + 4(-2) = 0 → x = +6.
10. What is the product of the neutralization reaction between HCl and
NaOH?
A. H₂O only
B. NaCl and H₂O
C. HCl and Na
D. NaCl only
An acid and base react to form a salt (NaCl) and water.
11. How many moles are in 22.4 L of gas at STP?
A. 1.5
B. 0.5
Practice Questions And Correct Answers
(Verified Answers) Plus Rationales 2025
Q&A | Instant Download PDF
1. What is the molar mass of calcium nitrate, Ca(NO₃)₂?
A. 102.09 g/mol
B. 164.10 g/mol
C. 118.09 g/mol
D. 85.07 g/mol
Calcium = 40.08, N = 14.01×2, O = 16.00×6; total = 164.10 g/mol.
2. Which of the following is a strong acid?
A. H₂CO₃
B. HCl
C. CH₃COOH
,D. NH₃
HCl is a strong acid because it completely ionizes in water.
3. What is the pH of a solution with [H⁺] = 1.0 x 10⁻⁴ M?
A. 3
B. 5
C. 4
D. 6
pH = -log[H⁺] = -log(1.0 x 10⁻⁴) = 4.
4. Which orbital is the last to fill for the element iron (Fe)?
A. 3d
B. 4p
C. 4s
D. 3p
Iron (atomic number 26) fills 4s before 3d, but 3d is the last to be filled in
the electron configuration.
5. Which of the following compounds is ionic?
A. NaCl
B. CO₂
C. CH₄
,D. NH₃
Ionic compounds form between metals and nonmetals; NaCl is made of
sodium (metal) and chlorine (nonmetal).
6. What is the percent composition of oxygen in H₂O?
A. 50%
B. 88.8%
C. 11.2%
D. 66.6%
O = 16, H₂ = 2. Total = 18. O% = (16/18)×100 ≈ 88.8%.
7. What type of bond involves the sharing of electrons?
A. Ionic
B. Covalent
C. Metallic
D. Hydrogen
Covalent bonds involve the sharing of electron pairs between atoms.
8. Which molecule has a trigonal planar shape?
A. CH₄
B. BF₃
C. H₂O
, D. NH₃
BF₃ has three regions of electron density around boron and no lone pairs,
giving it a trigonal planar shape.
9. What is the oxidation number of sulfur in H₂SO₄?
A. +4
B. +3
C. +6
D. 0
H is +1, O is -2. Let S = x: 2(+1) + x + 4(-2) = 0 → x = +6.
10. What is the product of the neutralization reaction between HCl and
NaOH?
A. H₂O only
B. NaCl and H₂O
C. HCl and Na
D. NaCl only
An acid and base react to form a salt (NaCl) and water.
11. How many moles are in 22.4 L of gas at STP?
A. 1.5
B. 0.5
