Practice Test Geeks(CMC) Certified Marine Chemist Practice Test
← All CMC Flashcard Decks

Chemical Hazard & Risk Management Flashcards

7 cards from real CMC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Chemical Hazard & Risk Management flashcards as text

  1. A Marine Chemist discovers that a space previously certified 'Safe for Workers' has experienced a temperature rise of 30°F since the initial test. Which reassessment is most critical?

    Answer: Re-measure flammable vapor concentrations, because increased temperature raises vapor pressure of residual liquids

    Rising temperature increases vapor pressure of residual hydrocarbons or other volatile substances, potentially elevating LEL readings and invalidating the original certificate.

  2. Under what circumstance would a Marine Chemist recommend using a supplied-air respirator (SAR) rather than a self-contained breathing apparatus (SCBA) during a prolonged confined space operation?

    Answer: When work duration exceeds the capacity of SCBA cylinders and a continuous airline can be rigged safely

    SARs with an airline supply allow extended work durations beyond SCBA cylinder limits while maintaining continuous breathing air, provided the airline routing is safe and not at risk of damage.

  3. Which marine cargo is classified as a Category X substance under MARPOL Annex II due to its severe hazard to marine resources?

    Answer: Acetone cyanohydrin (stabilized)

    Acetone cyanohydrin is classified as MARPOL Annex II Category X because it presents a major hazard to marine resources or human health if discharged into the sea.

  4. A Marine Chemist's risk assessment identifies a chemical that is both flammable and acutely toxic by inhalation. What instrument combination provides the most comprehensive initial air monitoring?

    Answer: CGI, oxygen meter, and a colorimetric detector tube or direct-reading instrument specific to the toxic vapor

    Dual flammability/toxicity hazards require a CGI for LEL monitoring, an oxygen meter for atmospheric sufficiency, and a chemical-specific instrument to verify the toxic component is below its occupational exposure limit.

  5. The Immediately Dangerous to Life or Health (IDLH) value represents the concentration at which:

    Answer: An individual could escape within 30 minutes without irreversible health effects or impaired escape ability

    NIOSH defines IDLH as the concentration from which a healthy worker could escape within 30 minutes without suffering irreversible health effects or any effect that impairs escape.

  6. When evaluating chemical hazards in a vessel tank farm, a Marine Chemist notes that two adjacent tanks contain incompatible chemicals. Which hazard assessment step is specifically required?

    Answer: Assess secondary containment capacity and evaluate the consequence of a failure allowing the chemicals to mix

    Incompatible chemical storage requires evaluation of containment barriers and the consequences of mixing, including potential exothermic reactions, fire, or toxic gas generation.

  7. A Marine Chemist issues a 'Safe for Hot Work' certificate with the condition 'continuous gas monitoring required.' What does this condition obligate the employer to do?

    Answer: Maintain uninterrupted atmospheric monitoring during all hot work operations and halt work immediately if readings change

    A continuous gas monitoring condition requires real-time, uninterrupted atmospheric testing throughout the hot work operation, with immediate work stoppage if hazardous conditions develop.

Chemical Hazard & Risk Management Flashcards — CMC Study Cards with Answers