CHEM 103 Introduction to General
Chemistry Lab Report 1 Portage
Learning Actual Exam 2026/2027 with
Detailed Rationales | Complete
Exam-Style Questions | Pass Guaranteed
– A+ Graded
Q1: What is the correct procedure for reading the volume of liquid in a graduated cylinder?
A. Read from the top of the meniscus at eye level
B. Read from the bottom of the meniscus while looking down
C. Read from the bottom of the meniscus at eye level [CORRECT]
D. Read from the top of the meniscus while looking up
Correct Answer: C
Rationale: Correct because the bottom of the meniscus provides the true volume reading, and
eye-level positioning eliminates parallax error in all volumetric measurements.
Q2: A student measures the mass of a beaker as 45.237 g. How many significant figures are
in this measurement?
A. 3
B. 4
C. 5 [CORRECT]
D. 6
Correct Answer: C
Rationale: Correct because all non-zero digits and any zeros between non-zero digits or after
the decimal point are significant, giving five significant figures in 45.237 g.
Q3: In the event of a chemical splash to the eyes, what is the first action a student should
take?
A. Notify the instructor immediately before doing anything else
B. Rub the eyes to remove the chemical
C. Use the eyewash station for at least 15 minutes [CORRECT]
D. Apply a neutralizing agent to the eyes
, Correct Answer: C
Rationale: Correct because immediate and prolonged flushing with water at the eyewash
station is the priority to dilute and remove chemicals, minimizing tissue damage before
further assistance.
Q4: When diluting a concentrated acid, which procedure is correct?
A. Add water slowly to the concentrated acid
B. Add acid and water simultaneously to the container
C. Add the concentrated acid slowly to water [CORRECT]
D. Pour the acid quickly into the water to minimize exposure
Correct Answer: C
Rationale: Correct because adding acid to water allows the heat of solution to dissipate
safely; adding water to acid can cause violent boiling and splattering of corrosive liquid.
Q5: What is the primary purpose of a fume hood in the laboratory?
A. To store volatile chemicals long-term
B. To provide a sterile workspace for biological samples
C. To vent hazardous vapors away from the user [CORRECT]
D. To maintain a constant temperature for reactions
Correct Answer: C
Rationale: Correct because the fume hood creates negative airflow that captures and
exhausts toxic, flammable, or noxious vapors, protecting the user from inhalation hazards.
Q6: A buret reading is recorded as 23.45 mL. To what precision is this measurement
reported?
A. 0.1 mL
B. 0.5 mL
C. 0.01 mL [CORRECT]
D. 0.001 mL
Correct Answer: C
Rationale: Correct because burets are calibrated to deliver volumes with precision to the
hundredths place, requiring readings estimated to ±0.01 mL for titration accuracy.
Q7: Which type of fire extinguisher is appropriate for a laboratory fire involving flammable
liquids?
A. Class A only
B. Class C only
C. Class B [CORRECT]
D. Class D
Correct Answer: C
Rationale: Correct because Class B extinguishers are designed specifically for flammable
liquid fires, including organic solvents and oils commonly found in chemistry laboratories.
Chemistry Lab Report 1 Portage
Learning Actual Exam 2026/2027 with
Detailed Rationales | Complete
Exam-Style Questions | Pass Guaranteed
– A+ Graded
Q1: What is the correct procedure for reading the volume of liquid in a graduated cylinder?
A. Read from the top of the meniscus at eye level
B. Read from the bottom of the meniscus while looking down
C. Read from the bottom of the meniscus at eye level [CORRECT]
D. Read from the top of the meniscus while looking up
Correct Answer: C
Rationale: Correct because the bottom of the meniscus provides the true volume reading, and
eye-level positioning eliminates parallax error in all volumetric measurements.
Q2: A student measures the mass of a beaker as 45.237 g. How many significant figures are
in this measurement?
A. 3
B. 4
C. 5 [CORRECT]
D. 6
Correct Answer: C
Rationale: Correct because all non-zero digits and any zeros between non-zero digits or after
the decimal point are significant, giving five significant figures in 45.237 g.
Q3: In the event of a chemical splash to the eyes, what is the first action a student should
take?
A. Notify the instructor immediately before doing anything else
B. Rub the eyes to remove the chemical
C. Use the eyewash station for at least 15 minutes [CORRECT]
D. Apply a neutralizing agent to the eyes
, Correct Answer: C
Rationale: Correct because immediate and prolonged flushing with water at the eyewash
station is the priority to dilute and remove chemicals, minimizing tissue damage before
further assistance.
Q4: When diluting a concentrated acid, which procedure is correct?
A. Add water slowly to the concentrated acid
B. Add acid and water simultaneously to the container
C. Add the concentrated acid slowly to water [CORRECT]
D. Pour the acid quickly into the water to minimize exposure
Correct Answer: C
Rationale: Correct because adding acid to water allows the heat of solution to dissipate
safely; adding water to acid can cause violent boiling and splattering of corrosive liquid.
Q5: What is the primary purpose of a fume hood in the laboratory?
A. To store volatile chemicals long-term
B. To provide a sterile workspace for biological samples
C. To vent hazardous vapors away from the user [CORRECT]
D. To maintain a constant temperature for reactions
Correct Answer: C
Rationale: Correct because the fume hood creates negative airflow that captures and
exhausts toxic, flammable, or noxious vapors, protecting the user from inhalation hazards.
Q6: A buret reading is recorded as 23.45 mL. To what precision is this measurement
reported?
A. 0.1 mL
B. 0.5 mL
C. 0.01 mL [CORRECT]
D. 0.001 mL
Correct Answer: C
Rationale: Correct because burets are calibrated to deliver volumes with precision to the
hundredths place, requiring readings estimated to ±0.01 mL for titration accuracy.
Q7: Which type of fire extinguisher is appropriate for a laboratory fire involving flammable
liquids?
A. Class A only
B. Class C only
C. Class B [CORRECT]
D. Class D
Correct Answer: C
Rationale: Correct because Class B extinguishers are designed specifically for flammable
liquid fires, including organic solvents and oils commonly found in chemistry laboratories.
