ACS Laboratory Practical Chemistry
Examination Questions and Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
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1. Which piece of glassware provides the most accurate measurement of a fixed
liquid volume?
A. Beaker
B. Erlenmeyer flask
C. Graduated cylinder
D. Volumetric flask
Correct Answer: D. Volumetric flask
Rationale: A volumetric flask is calibrated to contain one exact volume with very
high accuracy.
2. Which instrument is commonly used to measure mass in a chemistry
laboratory?
A. Thermometer
B. pH meter
C. Spectrophotometer
D. Analytical balance
Correct Answer: D. Analytical balance
Rationale: An analytical balance measures mass with high precision, typically to
0.0001 g.
,3. Before weighing a sample, the balance should be
A. Heated
B. Calibrated with water
C. Filled with sample
D. Tared
Correct Answer: D. Tared
Rationale: Taring sets the balance to zero so only the sample mass is measured.
4. Which glassware is commonly used to mix solutions during titration?
A. Volumetric flask
B. Test tube
C. Graduated cylinder
D. Erlenmeyer flask
Correct Answer: D. Erlenmeyer flask
Rationale: The conical shape allows easy swirling without spilling.
5. Which instrument is designed to deliver precise volumes during titration?
A. Pipette bulb
B. Beaker
C. Dropper
D. Buret
Correct Answer: D. Buret
Rationale: A buret dispenses measured volumes accurately during titrations.
6. The volume delivered from a buret is determined by
,A. The final reading only
B. The initial reading only
C. The average reading
D. Subtracting the initial reading from the final reading
Correct Answer: D. Subtracting the initial reading from the final reading
Rationale: Volume delivered equals the difference between the final and initial
buret readings.
7. Which device is used to transfer an exact liquid volume?
A. Beaker
B. Funnel
C. Test tube
D. Volumetric pipette
Correct Answer: D. Volumetric pipette
Rationale: A volumetric pipette delivers one precise volume accurately.
8. Which laboratory instrument measures temperature?
A. Balance
B. Buret
C. Stopwatch
D. Thermometer
Correct Answer: D. Thermometer
Rationale: Thermometers are designed to measure temperature.
9. Safety goggles should be worn
A. Only when heating chemicals
B. Only during titrations
, C. Only if instructed
D. Whenever laboratory work is performed
Correct Answer: D. Whenever laboratory work is performed
Rationale: Goggles protect the eyes from chemical splashes and flying debris.
10. The first action after a chemical splashes into the eye is to
A. Wipe the eye with a tissue
B. Close the eye tightly
C. Leave the laboratory
D. Flush the eye with water
Correct Answer: D. Flush the eye with water
Rationale: Immediate flushing helps remove the chemical and minimize injury.
11. A chemical fume hood is primarily used to
A. Dry glassware
B. Store chemicals
C. Measure temperature
D. Remove hazardous vapors
Correct Answer: D. Remove hazardous vapors
Rationale: Fume hoods protect users by ventilating harmful fumes away from the
breathing zone.
12. Which document provides information about chemical hazards and safe
handling?
A. Laboratory notebook
B. Equipment manual
C. Calibration chart
D. Safety Data Sheet (SDS)
Examination Questions and Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
1. Which piece of glassware provides the most accurate measurement of a fixed
liquid volume?
A. Beaker
B. Erlenmeyer flask
C. Graduated cylinder
D. Volumetric flask
Correct Answer: D. Volumetric flask
Rationale: A volumetric flask is calibrated to contain one exact volume with very
high accuracy.
2. Which instrument is commonly used to measure mass in a chemistry
laboratory?
A. Thermometer
B. pH meter
C. Spectrophotometer
D. Analytical balance
Correct Answer: D. Analytical balance
Rationale: An analytical balance measures mass with high precision, typically to
0.0001 g.
,3. Before weighing a sample, the balance should be
A. Heated
B. Calibrated with water
C. Filled with sample
D. Tared
Correct Answer: D. Tared
Rationale: Taring sets the balance to zero so only the sample mass is measured.
4. Which glassware is commonly used to mix solutions during titration?
A. Volumetric flask
B. Test tube
C. Graduated cylinder
D. Erlenmeyer flask
Correct Answer: D. Erlenmeyer flask
Rationale: The conical shape allows easy swirling without spilling.
5. Which instrument is designed to deliver precise volumes during titration?
A. Pipette bulb
B. Beaker
C. Dropper
D. Buret
Correct Answer: D. Buret
Rationale: A buret dispenses measured volumes accurately during titrations.
6. The volume delivered from a buret is determined by
,A. The final reading only
B. The initial reading only
C. The average reading
D. Subtracting the initial reading from the final reading
Correct Answer: D. Subtracting the initial reading from the final reading
Rationale: Volume delivered equals the difference between the final and initial
buret readings.
7. Which device is used to transfer an exact liquid volume?
A. Beaker
B. Funnel
C. Test tube
D. Volumetric pipette
Correct Answer: D. Volumetric pipette
Rationale: A volumetric pipette delivers one precise volume accurately.
8. Which laboratory instrument measures temperature?
A. Balance
B. Buret
C. Stopwatch
D. Thermometer
Correct Answer: D. Thermometer
Rationale: Thermometers are designed to measure temperature.
9. Safety goggles should be worn
A. Only when heating chemicals
B. Only during titrations
, C. Only if instructed
D. Whenever laboratory work is performed
Correct Answer: D. Whenever laboratory work is performed
Rationale: Goggles protect the eyes from chemical splashes and flying debris.
10. The first action after a chemical splashes into the eye is to
A. Wipe the eye with a tissue
B. Close the eye tightly
C. Leave the laboratory
D. Flush the eye with water
Correct Answer: D. Flush the eye with water
Rationale: Immediate flushing helps remove the chemical and minimize injury.
11. A chemical fume hood is primarily used to
A. Dry glassware
B. Store chemicals
C. Measure temperature
D. Remove hazardous vapors
Correct Answer: D. Remove hazardous vapors
Rationale: Fume hoods protect users by ventilating harmful fumes away from the
breathing zone.
12. Which document provides information about chemical hazards and safe
handling?
A. Laboratory notebook
B. Equipment manual
C. Calibration chart
D. Safety Data Sheet (SDS)
