Quiz: Organic Chemistry Laboratory Safety — 21 Fragen

1. What should a student do immediately after noticing a chemical leak in the laboratory?

A. Begin independent instrument training

B. Alert the faculty member in charge

C. Continue working while wearing protective equipment

D. Complete the laboratory pre-report

Answer: (B)

Erklärung

Students must immediately alert the faculty in charge so the chemical leak can be properly assisted. Completing requirements is a preparation step, not the response to an existing leak.

2. Which situation best distinguishes a major chemical spill from a minor chemical spill?

A. A large, toxic, flammable, or vapor-producing spill requiring immediate evacuation

B. A spill that can be cleaned with detergent and water

C. A spill whose residues can be placed in a labelled waste container

D. A small, easily controlled amount handled by laboratory personnel

Answer: (A)

Erklärung

A major spill involves a large quantity, significant toxicity or flammability, or dangerous vapors and requires immediate evacuation. Minor spills are the ones laboratory personnel may control with a spill kit.

3. For how long should a chemical exposure to the skin or eyes be continuously flushed?

A. For at least 5 minutes

B. Until the affected area feels warm

C. For at least 10 minutes

D. For at least 15 minutes

Answer: (D)

Erklärung

Chemical exposure to the skin or eyes requires continuous flushing for a minimum of 15 minutes.

4. Which combination best represents the three practices required for safe science?

A. Protective clothing, equipment approval, and chemical disposal

B. Preparedness, professional discipline, and prompt leak reporting

C. Laboratory entry, instrument training, and independent operation

D. Experiment design, substance analysis, and reaction measurement

Answer: (B)

Erklärung

Safe science combines preparation before laboratory work, disciplined professional behavior during activities, and immediate reporting when a chemical leak occurs.

5. Why must the match be struck before the Bunsen burner gas valve is opened?

A. To ensure the air hole remains fully open

B. To make the flame yellow before heating begins

C. To cool the burner before gas enters it

D. To prevent gas from accumulating before ignition

Answer: (D)

Erklärung

Striking the match first allows immediate ignition when the gas is released and prevents gas buildup, which could create a safety hazard.

6. Which movement choice follows earthquake safety protocol?

A. Stand near windows to observe whether evacuation is necessary

B. Use an elevator to leave the laboratory quickly

C. Stay away from windows and avoid using elevators

D. Move toward glass cabinets because they provide visibility

Answer: (C)

Erklärung

During an earthquake, people should stay away from windows and never use elevators because both can increase danger during shaking or evacuation.

7. Which sequence represents laboratory waste management under DENR RA. 6969?

A. Generation, segregation, containerization, and collection

B. Collection, generation, disposal, and segregation

C. Segregation, collection, generation, and containerization

D. Containerization, disposal, generation, and collection

Answer: (A)

Erklärung

The process proceeds from waste generation to segregation, then containerization, followed by collection for proper storage or disposal.

8. What must students complete before entering or participating in laboratory activities?

A. The laboratory pre-report and review of relevant safety data sheets

B. A chemical leak report and an equipment maintenance form

C. Instrument approval and a log entry for every future use

D. A demonstration of every experiment without guidance

Answer: (A)

Erklärung

Students must complete the laboratory pre-report and review all relevant safety data sheets before participating. The pre-report demonstrates preparedness, while the safety data sheets provide hazard awareness.

9. What is the correct sequence for safely igniting and adjusting a Bunsen burner?

A. Open the gas valve, strike the match, close the air hole, and adjust the flame

B. Clear the area, open the gas valve, strike the match, and adjust the air hole

C. Clear the area, close the air hole, strike the match, open the gas valve, and adjust the air hole

D. Strike the match, open the gas valve, clear the area, and close the air hole

Answer: (C)

Erklärung

Safe ignition begins by inspecting and clearing the area, closing the air hole, and striking the match before opening the gas valve. The air hole is then adjusted to produce a blue heating flame.

10. Which behavior is permitted under the laboratory’s professional conduct rules?

A. Bringing a drink into the laboratory

B. Maintaining focused attention on laboratory work

C. Playing a prank during a waiting period

D. Eating a snack beside the work area

Answer: (B)

Erklärung

Focused laboratory work is part of professional conduct. Horseplay, pranks, eating, and bringing drinks into the laboratory are prohibited.

11. Which pairing correctly matches each waste type with its appropriate container?

A. Light-sensitive chemicals—polyethylene carboy; biological hazards—amber glass bottle

B. Liquid chemical waste—polyethylene carboy; sharp objects—rigid sharps container

C. Liquid chemical waste—amber glass bottle; sharp objects—biohazard container

D. Light-sensitive chemicals—rigid sharps container; sharp objects—polyethylene carboy

Answer: (B)

Erklärung

Liquid chemical waste belongs in a polyethylene carboy, while sharp objects require a rigid sharps container. Amber glass bottles are used for light-sensitive chemicals, and biohazard containers are used for potentially biologically hazardous materials.

12. Which action violates fume hood safety rules?

A. Keeping the sash at the safe working height

B. Checking the airflow indicator before starting work

C. Putting a chemical waste container inside the hood for storage

D. Placing chemical equipment at least 15 cm inside the hood

Answer: (C)

Erklärung

A fume hood should not be used as a storage cabinet for chemicals or waste. The sash must also remain below the safety line, and users must keep their heads outside the hood.

13. Which set of clothing and equipment satisfies the required personal protective equipment standards?

A. Goggles, a hairnet, an apron or gown over a sleeved shirt, full-length pants, and closed shoes

B. Goggles, a laboratory gown, cropped pants, and athletic shoes with open sides

C. Safety glasses, short sleeves, shorts, sandals, and a disposable mask

D. A hairnet, sleeveless shirt, full-length pants, and open-toed shoes

Answer: (A)

Erklärung

Required PPE includes goggles and a hairnet, an apron or gown over a sleeved shirt, full-length pants, and closed shoes.

14. Before beginning work in a fume hood, which setup follows the required safety procedure?

A. Keep the sash at 30–45 cm, place equipment at least 15 cm inside, and check the airflow indicator

B. Raise the sash above the safety line, place equipment near the opening, and check the airflow indicator

C. Keep the sash at 30–45 cm, place equipment near the opening, and store waste inside the hood

D. Raise the sash above the safety line, place equipment at least 15 cm inside, and skip the airflow check

Answer: (A)

Erklärung

Safe use requires the sash to remain at a 30–45 cm working height, equipment to be at least 15 cm inside, and airflow indicators or alarms to be checked before work begins.

15. How should a small gas fire be handled when the gas source is safely reachable?

A. Shut off the source if safe and use a Class B or C extinguisher

B. Pull the alarm and remain nearby until the fire burns out

C. Use a Class A extinguisher while leaving the gas source open

D. Apply water directly to the flames before approaching the gas source

Answer: (A)

Erklärung

For a small gas fire, shut off the gas source only if it is safe to reach and use a Class B or C extinguisher. Water must not be used on gas or electrical fires.

16. What is the appropriate sequence for responding to a minor chemical spill?

A. Alert and protect personnel, contain and neutralize the spill, collect labelled waste, decontaminate, then report

B. Evacuate immediately, pull the alarm, and wait for emergency responders

C. Report the spill first, then leave all residues for laboratory personnel to handle later

D. Neutralize the spill, wash the area, and ignite nearby equipment to check for vapors

Answer: (A)

Erklärung

Minor-spill response includes protecting personnel, containing and neutralizing the material, collecting residues in labelled waste, decontaminating with detergent and water, and reporting the incident.

17. What is the purpose of demonstrating instrument use under guidance before receiving approval?

A. To allow unrestricted use before any approval is issued

B. To document only the number of times the instrument is used

C. To verify competent use before independent access is granted

D. To replace the request evaluation with informal instruction

Answer: (C)

Erklärung

The guided demonstration verifies that the student can use the instrument properly before approval permits independent access. Logging use is a later requirement, not the purpose of the demonstration.

18. What should you do first when a suspected gas leak produces a rotten-egg odor or hissing sound?

A. Flip electrical switches to improve ventilation

B. Ignite a small flame to locate the leak

C. Use water to suppress the leaking gas

D. Avoid ignition sources and electrical switches, then shut the nearest valve if safe or evacuate

Answer: (D)

Erklärung

A suspected gas leak requires avoiding flames and electrical switches. The nearest valve may be turned off if safe; otherwise, evacuate and notify the safety instructor when the leak is widespread.

19. Which sequence correctly describes the process for gaining independent access to an instrument?

A. Submit a request, receive immediate access, complete training afterward, and log only unsuccessful uses

B. Attend training, use the instrument independently, submit a request, receive approval, and log selected uses

C. Submit a request, receive evaluation, attend training, demonstrate use under guidance, receive approval, and log every use

D. Demonstrate use independently, receive approval, attend training, submit a request, and record maintenance

Answer: (C)

Erklärung

Independent access requires six stages in order: request submission, evaluation, training, guided demonstration, approval, and logging every use.

20. What is the correct protective sequence during an earthquake in a laboratory?

A. Continue the experiment while standing beneath an active bench

B. Move toward chemical shelves, then stand beside a glass cabinet for support

C. Run immediately to the nearest elevator after disconnecting the experiment

D. Shut off the Bunsen burner and power down equipment, move away from hazards, then drop, cover, and hold under sturdy furniture

Answer: (D)

Erklärung

The protocol is to shut off the burner and electrical equipment, move away from shelves, glass cabinets, and active benches, then drop, cover the head, and hold on under a sturdy table or desk.

21. Which response correctly matches the equipment and actions for eye exposure versus body exposure?

A. Cover the eyes and remove clothing only after medical evaluation

B. Rinse both exposures briefly at a sink without removing contaminated clothing

C. Activate the eyewash and hold the eyelids open for eyes; use the safety shower and remove contaminated clothing for the body

D. Use the safety shower for eyes and an eyewash for the body

Answer: (C)

Erklärung

Eye exposure requires activating the eyewash and holding the eyelids open. Body exposure requires using the safety shower, standing under the flow, and removing contaminated clothing.