CHEM 123 LAB FINAL (UBC-Level) EXAM LATEST
2026 UPDATE 100 QUESTIONS AND DETAILED
VERIFIED ANSWERS FROM ACTUAL EXAMS TEST
GRADE A+
1. What is the primary purpose of a fume hood?
A. Increase reaction rate
B. Protect from chemical vapors
C. Store chemicals
D. Measure gases
Answer: B
Fume hoods remove hazardous vapors, protecting the user from inhalation
exposure.
2. Which glassware provides the most accurate volume measurement?
A. Beaker
B. Erlenmeyer flask
C. Graduated cylinder
D. Volumetric flask
Answer: D
Volumetric flasks are calibrated for precise volume measurement at a specific
mark.
3. What is the correct way to read a burette?
A. From the top meniscus
B. From the bottom meniscus at eye level
C. At any angle
D. From above
,Answer: B
Reading at eye level avoids parallax error and ensures accurate measurement.
4. Which PPE is always required in a chemistry lab?
A. Gloves only
B. Goggles only
C. Lab coat, goggles, and appropriate clothing
D. Mask only
Answer: C
Standard PPE includes goggles, lab coat, and proper attire for full protection.
5. What should you do if a chemical spills on your skin?
A. Ignore it
B. Wipe with tissue
C. Rinse immediately with water
D. Report later
Answer: C
Immediate rinsing reduces chemical damage and absorption.
6. Which is used to transfer small amounts of solid chemicals?
A. Pipette
B. Scoopula
C. Burette
D. Flask
Answer: B
Scoopulas are designed for handling solid reagents safely.
7. Why should you never pipette by mouth?
A. It is inaccurate
, B. It wastes chemicals
C. It risks ingestion of hazardous substances
D. It is slow
Answer: C
Mouth pipetting can lead to accidental ingestion of toxic chemicals.
8. What is the purpose of a wash bottle?
A. Heating
B. Measuring
C. Rinsing glassware
D. Storage
Answer: C
Wash bottles dispense distilled water for rinsing and transferring residues.
9. Which flame is hottest in a Bunsen burner?
A. Yellow luminous flame
B. Blue non-luminous flame
C. Orange flame
D. Red flame
Answer: B
The blue flame indicates complete combustion and higher temperature.
10. What is the correct action if a fire starts?
A. Run away
B. Use water
C. Use fire extinguisher or fire blanket
D. Ignore
Answer: C
Fire blankets or extinguishers are designed to safely control lab fires.
2026 UPDATE 100 QUESTIONS AND DETAILED
VERIFIED ANSWERS FROM ACTUAL EXAMS TEST
GRADE A+
1. What is the primary purpose of a fume hood?
A. Increase reaction rate
B. Protect from chemical vapors
C. Store chemicals
D. Measure gases
Answer: B
Fume hoods remove hazardous vapors, protecting the user from inhalation
exposure.
2. Which glassware provides the most accurate volume measurement?
A. Beaker
B. Erlenmeyer flask
C. Graduated cylinder
D. Volumetric flask
Answer: D
Volumetric flasks are calibrated for precise volume measurement at a specific
mark.
3. What is the correct way to read a burette?
A. From the top meniscus
B. From the bottom meniscus at eye level
C. At any angle
D. From above
,Answer: B
Reading at eye level avoids parallax error and ensures accurate measurement.
4. Which PPE is always required in a chemistry lab?
A. Gloves only
B. Goggles only
C. Lab coat, goggles, and appropriate clothing
D. Mask only
Answer: C
Standard PPE includes goggles, lab coat, and proper attire for full protection.
5. What should you do if a chemical spills on your skin?
A. Ignore it
B. Wipe with tissue
C. Rinse immediately with water
D. Report later
Answer: C
Immediate rinsing reduces chemical damage and absorption.
6. Which is used to transfer small amounts of solid chemicals?
A. Pipette
B. Scoopula
C. Burette
D. Flask
Answer: B
Scoopulas are designed for handling solid reagents safely.
7. Why should you never pipette by mouth?
A. It is inaccurate
, B. It wastes chemicals
C. It risks ingestion of hazardous substances
D. It is slow
Answer: C
Mouth pipetting can lead to accidental ingestion of toxic chemicals.
8. What is the purpose of a wash bottle?
A. Heating
B. Measuring
C. Rinsing glassware
D. Storage
Answer: C
Wash bottles dispense distilled water for rinsing and transferring residues.
9. Which flame is hottest in a Bunsen burner?
A. Yellow luminous flame
B. Blue non-luminous flame
C. Orange flame
D. Red flame
Answer: B
The blue flame indicates complete combustion and higher temperature.
10. What is the correct action if a fire starts?
A. Run away
B. Use water
C. Use fire extinguisher or fire blanket
D. Ignore
Answer: C
Fire blankets or extinguishers are designed to safely control lab fires.
