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CHEM 103 General Chemistry I Exam Bank:
Modules 1-6 & Final Exam (Portage Learning)
Questions 1–200 | 200 Questions and Verified
Answers | A+ Graded
1. Which of the following is defined as anything that has mass and occupies space?
A. Energy
B. Matter
C. Vacuum
D. Force
☑ Correct Answer: B
☑ Explanation: Matter is the physical substance of the universe that possesses mass and occupies
a physical volume, distinguishing it from forms of energy such as light or heat. A vacuum contains no
matter, and force is an interaction that causes change in motion.
2. Convert 845.3 to scientific notation.
A. 84.53 × 10¹
B. 8.453 × 10²
C. 0.8453 × 10³
,2
D. 8453 × 10⁻¹
☑ Correct Answer: B
☑ Explanation: To convert to scientific notation, move the decimal point so there is one non-zero
digit to the left of the decimal. 845.3 → 8.453. The decimal was moved 2 places to the left, so the
exponent is +2.
3. Convert 0.0000726 to scientific notation.
A. 7.26 × 10⁻⁵
B. 7.26 × 10⁵
C. 72.6 × 10⁻⁶
D. 0.726 × 10⁻⁴
☑ Correct Answer: A
☑ Explanation: Move the decimal point 5 places to the right to get 7.26, so the exponent is -5.
The number is less than 1, so the exponent must be negative.
4. How many significant figures are in the measurement 0.004050?
A. 3
,3
B. 4
C. 5
D. 6
☑ Correct Answer: B
☑ Explanation: Leading zeros are not significant. The digits 4, 0, 5, and the trailing zero after the
decimal are all significant. Thus, 0.004050 has 4 significant figures (4, 0, 5, 0).
5. Perform the following calculation and report the answer with the correct number of significant
figures: 12.34 × 5.6
A. 69.104
B. 69.10
C. 69
D. 69.1
☑ Correct Answer: C
☑ Explanation: 5.6 has only 2 significant figures, so the answer should have 2 significant figures.
12.34 × 5.6 = 69.104, which rounds to 69 (2 sig figs).
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6. Perform the following calculation and report the answer with the correct number of significant
figures: 45.67 + 2.3
A. 47.97
B. 48.0
C. 47.9
D. 48
☑ Correct Answer: B
☑ Explanation: For addition, the answer should have the same number of decimal places as the
measurement with the fewest decimal places. 2.3 has one decimal place, so the answer should have one
decimal place. 45.67 + 2.3 = 47.97, which rounds to 48.0.
7. Convert 25.0°C to Kelvin.
A. 248.2 K
B. 298.2 K
C. 273.2 K
D. 25.0 K
☑ Correct Answer: B
CHEM 103 General Chemistry I Exam Bank:
Modules 1-6 & Final Exam (Portage Learning)
Questions 1–200 | 200 Questions and Verified
Answers | A+ Graded
1. Which of the following is defined as anything that has mass and occupies space?
A. Energy
B. Matter
C. Vacuum
D. Force
☑ Correct Answer: B
☑ Explanation: Matter is the physical substance of the universe that possesses mass and occupies
a physical volume, distinguishing it from forms of energy such as light or heat. A vacuum contains no
matter, and force is an interaction that causes change in motion.
2. Convert 845.3 to scientific notation.
A. 84.53 × 10¹
B. 8.453 × 10²
C. 0.8453 × 10³
,2
D. 8453 × 10⁻¹
☑ Correct Answer: B
☑ Explanation: To convert to scientific notation, move the decimal point so there is one non-zero
digit to the left of the decimal. 845.3 → 8.453. The decimal was moved 2 places to the left, so the
exponent is +2.
3. Convert 0.0000726 to scientific notation.
A. 7.26 × 10⁻⁵
B. 7.26 × 10⁵
C. 72.6 × 10⁻⁶
D. 0.726 × 10⁻⁴
☑ Correct Answer: A
☑ Explanation: Move the decimal point 5 places to the right to get 7.26, so the exponent is -5.
The number is less than 1, so the exponent must be negative.
4. How many significant figures are in the measurement 0.004050?
A. 3
,3
B. 4
C. 5
D. 6
☑ Correct Answer: B
☑ Explanation: Leading zeros are not significant. The digits 4, 0, 5, and the trailing zero after the
decimal are all significant. Thus, 0.004050 has 4 significant figures (4, 0, 5, 0).
5. Perform the following calculation and report the answer with the correct number of significant
figures: 12.34 × 5.6
A. 69.104
B. 69.10
C. 69
D. 69.1
☑ Correct Answer: C
☑ Explanation: 5.6 has only 2 significant figures, so the answer should have 2 significant figures.
12.34 × 5.6 = 69.104, which rounds to 69 (2 sig figs).
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6. Perform the following calculation and report the answer with the correct number of significant
figures: 45.67 + 2.3
A. 47.97
B. 48.0
C. 47.9
D. 48
☑ Correct Answer: B
☑ Explanation: For addition, the answer should have the same number of decimal places as the
measurement with the fewest decimal places. 2.3 has one decimal place, so the answer should have one
decimal place. 45.67 + 2.3 = 47.97, which rounds to 48.0.
7. Convert 25.0°C to Kelvin.
A. 248.2 K
B. 298.2 K
C. 273.2 K
D. 25.0 K
☑ Correct Answer: B
