CHEM 103 Final Exam 2025 Latest Update Exam 80 Questions with 100% Verified Correct Answers Guaranteed A+

CHEM 103 Final Exam 2025 Latest Update 2025-
2026 Exam 80 Questions with 100% Verified
Correct Answers Guaranteed A+

A certain nonmetal atom has 74 neutrons and a mass number of 127. Which element is
this?

a. I
b. Xe

c. W

d. Te

e. More information is needed



Exam 2 - CORRECT ANSWER: a. I


According to the metric system, 1 m = 0.001 what?

a. cm

b. mm

c. dm
d. km

e. None of the above



Exam 1 - CORRECT ANSWER: d. km


Add 250.0 mL to 5.00 mL and round off the answer.

a. 250 mL

b. 255 mL
c. 256 mL

,d. 255.0 mL

e. 255.0 mL



Exam 1 - CORRECT ANSWER: d. 255.0 mL



Ammonium borate has the formula (NH₄)₃BO₃. Calculate the percent by mass for each
of the elements present.



Exam 2 - CORRECT ANSWER: N₃ = 42.00

H₁₂ = 12.096

B = 10.81

O₃ =48.00

Mr (NH₄)₃BO₃ = 113.0

N = 42.00 ÷ 113.0 x 100 = 37%
H = 12.096 ÷ 113.0 x 100 = 11%

B = 10.81 ÷ 113.0 x 100 = 10%

O = 48.00 ÷ 113.0 x 100 = 42%



An atom of palladium (Pd) and a mass number of 105. How many neutrons does it
have?

a. 105

b. 46

c. 92

d. 106
e. 59


Exam 2 - CORRECT ANSWER: e. 59

105 - 46 = 59

, Balance the following reaction: C₄H₁₀ + O₂ → CO₂ + H₂O



Exam 2 - CORRECT ANSWER: 2C₄H₁₀ + 13O₂ → 8CO₂ + 10H₂O



Balance the following reaction: Co + O₂ → Co₂O₃



Exam 2 - CORRECT ANSWER: 4Co + 3O₂ → 2Co₂O₃



Balance the following reaction: KOH + H₂SO₄ → K₂SO₄ + H₂O



Exam 2 - CORRECT ANSWER: 2KOH + H₂SO₄ → K₂SO₄ + 2H₂O



Balance the following reaction: Na₃PO₄ + Ba(CIO₄)₂ → Ba₃(PO₄)₂ + NaCIO₄



Exam 2 - CORRECT ANSWER: 2Na₃PO₄ + 3Ba(CIO₄)₂ → Ba₃(PO₄)₂ + 6NaCIO₄



For the calculation (1.200 x 1.23466 x 1.0986) - 1.33, which is the correct answer?
a. 0.298

b. 0.3

c. 0.30

d. 0.2977

e. 0.29



Exam 1 - CORRECT ANSWER: c. 0.30