Common Molecules You Need to Know for the DAT

Polyatomic ions: The common polyatomic ions you need to know for the DAT are:
• Hydroxide: OH⁻
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• Nitrate: NO₃⁻

• Chlorate: ClO₃⁻

• Acetate: CH₃COO⁻

• Permanganate: MnO₄⁻

• Cyanide: CN⁻

• Sulfate: SO₄²⁻

• Carbonate: CO₃²⁻

• Phosphate: PO₄³⁻

• Ammonium: NH₄⁺

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Diatomic elements: The elements H, N, O, F, Cl, Br, and I exist as diatomic molecules in their standard states. At 25 °C and 1 atm: H₂, N₂, O₂, F₂, and Cl₂ are gases; Br₂ is a liquid; and I₂ is a solid.

Mnemonic: Have No Fear Of Ice Cold Beer

• Have - Hydrogen
• No - Nitrogen
• Fear - Fluorine
• Of - Oxygen
• Ice - Iodine (solid, just like ice)
• Cold - Chlorine
• Beer - Bromine (liquid, just like beer)

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