4h Medic Anna Flashcards
What is the mnemonic to remember the 14 gases lighter than air?
4H MEDIC ANNA
What does the ‘4H’ in the mnemonic stand for?
- Hydrogen (H₂) - MW: 2
- Helium (He) - MW: 4
- Hydrogen Cyanide (HCN) - MW: 27
- Hydrogen Fluoride (HF) - MW: 20
What does the ‘M’ in MEDIC stand for, and what is its molecular weight?
Methane (CH₄) - MW: 16
What does the ‘E’ in MEDIC stand for, and what is its molecular weight?
Ethylene (C₂H₄) - MW: 28
What does the ‘D’ in MEDIC stand for, and what is its molecular weight?
Diborane (B₂H₆) - MW: 27.67
What does the ‘I’ in MEDIC stand for?
Illuminating Gas, primarily Methane/Ethane (historical mixture)
What does the ‘C’ in MEDIC stand for, and what is its molecular weight?
Carbon Monoxide (CO) - MW: 28
What does the first ‘A’ in ANNA stand for, and what is its molecular weight?
Ammonia (NH₃) - MW: 17
What does the first ‘N’ in ANNA stand for, and what is its molecular weight?
Neon (Ne) - MW: 20.18
What does the second ‘N’ in ANNA stand for, and what is its molecular weight?
Nitrogen (N₂) - MW: 28.01
What does the second ‘A’ in ANNA stand for, and what is its molecular weight?
Acetylene (C₂H₂) - MW: 26
Which gas in ‘4H MEDIC ANNA’ is the lightest of all gases?
Hydrogen (H₂) - MW: 2
Which gases in the mnemonic have molecular weights close to air (MW ~29) but are still slightly lighter?
- Carbon Monoxide (CO) - MW: 28
- Nitrogen (N₂) - MW: 28.01
- Ethylene (C₂H₄) - MW: 28
Why are these gases important to consider in hazmat situations?
These gases will rise and concentrate in higher areas, such as ceilings or attics, requiring monitoring and ventilation strategies specific to lighter-than-air gases.
Which gases in ‘4H MEDIC ANNA’ have flammable properties?
- Hydrogen (H₂)
- Methane (CH₄)
- Ethylene (C₂H₄)
- Acetylene (C₂H₂)
- Diborane (B₂H₆)
Fill in the blank: The molecular weight of Hydrogen Cyanide (HCN) is _______.
27
True or False: All gases in ‘4H MEDIC ANNA’ are non-flammable.
False
What is the molecular weight of Helium (He)?
4
Fill in the blank: The gas with the molecular weight of 20.18 in ‘4H MEDIC ANNA’ is _______.
Neon (Ne)
4H medic Anna
4H:
• Hydrogen
• Helium
• Hydrogen Cyanide
• Hydrogen Fluoride
• MEDIC: • Methane • Ethylene • Diborane • Illuminating Gases • Carbon Monoxide • ANNA: • Acetylene • Neon • Nitrogen • Ammonia
