CHM2046L Final Exam UF Spring Study
Guide EXAM QUESTIONS AND CORRECT
ANSWERS (VERIFIED ANSWERS) PLUS
RATIONALES 2026 Q&A | INSTANT
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University of Florida Chemistry 2 Lab
Review & Practice
1. Significant Figures
Question:
How many significant figures are in 0.004560?
A. 3
B. 4
C. 5
D. 6
Answer: B
Rationale:
Leading zeros are not significant. Digits 4, 5, 6, 0 are significant → 4 sig figs.
2. Density Calculation
Question:
A sample has a mass of 25.0 g and volume of 10.0 mL. What is the density?
A. 0.400 g/mL
B. 2.50 g/mL
C. 15.0 g/mL
D. 35.0 g/mL
,Answer: B
Rationale:
Density = mass ÷ volume = 25.0 ÷ 10.0 = 2.50 g/mL
3. Error Type
Question:
A balance consistently reads 0.20 g too high. This is:
A. Random error
B. Systematic error
C. Human error only
D. Calculation error
Answer: B
Rationale:
A consistent offset indicates systematic error.
4. Titration Endpoint
Question:
The endpoint of a titration is:
A. Exact equivalence point
B. When indicator changes color
C. When solution boils
D. When acid is gone
Answer: B
Rationale:
Endpoint is the observed indicator change, near equivalence point.
5. Molarity
Question:
What is molarity of 0.50 mol NaCl in 2.0 L solution?
,A. 0.25 M
B. 1.0 M
C. 2.5 M
D. 0.50 M
Answer: A
Rationale:
M = 0.50 ÷ 2.0 = 0.25 M
6. Limiting Reagent
Question:
The limiting reagent is:
A. Excess reactant
B. Reactant fully consumed first
C. Catalyst
D. Product formed
Answer: B
Rationale:
It determines maximum product yield.
7. Percent Yield
Question:
If theoretical yield is 10 g and actual yield is 8 g, percent yield is:
A. 80%
B. 75%
C. 85%
D. 90%
Answer: A
Rationale:
(8 ÷ 10) × 100 = 80%
, 8. Spectrophotometry
Question:
Absorbance is directly proportional to:
A. Concentration
B. Volume
C. Temperature
D. Pressure
Answer: A
Rationale:
Beer-Lambert Law: A ∝ concentration
9. Calibration Curve
Question:
A calibration curve is used to:
A. Measure pH only
B. Determine unknown concentration
C. Increase reaction rate
D. Measure temperature
Answer: B
Rationale:
It relates absorbance vs concentration.
10. pH Concept
Question:
A solution with pH 3 is:
A. Neutral
B. Basic
C. Acidic
D. Buffer
Answer: C
Guide EXAM QUESTIONS AND CORRECT
ANSWERS (VERIFIED ANSWERS) PLUS
RATIONALES 2026 Q&A | INSTANT
DOWNLOAD PDF
University of Florida Chemistry 2 Lab
Review & Practice
1. Significant Figures
Question:
How many significant figures are in 0.004560?
A. 3
B. 4
C. 5
D. 6
Answer: B
Rationale:
Leading zeros are not significant. Digits 4, 5, 6, 0 are significant → 4 sig figs.
2. Density Calculation
Question:
A sample has a mass of 25.0 g and volume of 10.0 mL. What is the density?
A. 0.400 g/mL
B. 2.50 g/mL
C. 15.0 g/mL
D. 35.0 g/mL
,Answer: B
Rationale:
Density = mass ÷ volume = 25.0 ÷ 10.0 = 2.50 g/mL
3. Error Type
Question:
A balance consistently reads 0.20 g too high. This is:
A. Random error
B. Systematic error
C. Human error only
D. Calculation error
Answer: B
Rationale:
A consistent offset indicates systematic error.
4. Titration Endpoint
Question:
The endpoint of a titration is:
A. Exact equivalence point
B. When indicator changes color
C. When solution boils
D. When acid is gone
Answer: B
Rationale:
Endpoint is the observed indicator change, near equivalence point.
5. Molarity
Question:
What is molarity of 0.50 mol NaCl in 2.0 L solution?
,A. 0.25 M
B. 1.0 M
C. 2.5 M
D. 0.50 M
Answer: A
Rationale:
M = 0.50 ÷ 2.0 = 0.25 M
6. Limiting Reagent
Question:
The limiting reagent is:
A. Excess reactant
B. Reactant fully consumed first
C. Catalyst
D. Product formed
Answer: B
Rationale:
It determines maximum product yield.
7. Percent Yield
Question:
If theoretical yield is 10 g and actual yield is 8 g, percent yield is:
A. 80%
B. 75%
C. 85%
D. 90%
Answer: A
Rationale:
(8 ÷ 10) × 100 = 80%
, 8. Spectrophotometry
Question:
Absorbance is directly proportional to:
A. Concentration
B. Volume
C. Temperature
D. Pressure
Answer: A
Rationale:
Beer-Lambert Law: A ∝ concentration
9. Calibration Curve
Question:
A calibration curve is used to:
A. Measure pH only
B. Determine unknown concentration
C. Increase reaction rate
D. Measure temperature
Answer: B
Rationale:
It relates absorbance vs concentration.
10. pH Concept
Question:
A solution with pH 3 is:
A. Neutral
B. Basic
C. Acidic
D. Buffer
Answer: C
