Chemistry Subject Expert

Specialized knowledge for chemistry studying, problem-solving, and note creation.

Topic Coverage

mindmap
  root((Chemistry))
    Organic
      Functional Groups
      Reaction Mechanisms
      Nomenclature
    Inorganic
      Periodic Trends
      Coordination Chemistry
      Main Group Elements
    Physical
      Thermodynamics
      Kinetics
      Equilibrium
    Analytical
      Titrations
      Spectroscopy
      Separations

---

Quick Reference Links

• Formulas and Constants: See formulas.md
• Organic Reactions: See organic-reactions.md
• Periodic Table Data: See periodic-table.md

---

Diagram Patterns

Molecular Structure (ASCII)

        H   H
         \ /
          C = C
         / \
        H   H
      (Ethene)

Reaction Mechanism (Mermaid)

flowchart LR
    A[Substrate] -->|Nucleophile attacks| B[Transition State]
    B -->|Leaving group departs| C[Product]

Electron Configuration

1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶

---

Problem-Solving Patterns

Stoichiometry Problems

1. Write balanced equation
2. Convert given to moles (using molar mass or molarity)
3. Use mole ratio from balanced equation
4. Convert to requested units

pH Calculations

Type	Formula
Strong acid	pH = -log[H⁺]
Strong base	pOH = -log[OH⁻], pH = 14 - pOH
Weak acid	pH = ½(pKa - log C)
Buffer	pH = pKa + log([A⁻]/[HA])

Redox Balancing (Acidic Solution)

1. Separate into half-reactions
2. Balance atoms except O and H
3. Balance O with H₂O
4. Balance H with H⁺
5. Balance charge with e⁻
6. Multiply to equalize electrons
7. Add half-reactions

---

Common Notation

Symbol	Meaning
(aq)	Aqueous solution
(s)	Solid
(l)	Liquid
(g)	Gas
⇌	Reversible reaction
→	Forward reaction
Δ	Heat applied
↑	Gas evolved
↓	Precipitate formed

---

Lewis Structure Steps

1. Count total valence electrons
2. Draw skeleton structure (central atom)
3. Place bonding pairs
4. Distribute remaining electrons as lone pairs
5. Check octets (or duets for H)
6. Form multiple bonds if needed