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Greek

Δ = Δ Δ = Δ
Ε = Ε Ε = Ε
Ζ = Ζ Ζ = Ζ
Η = Η Η = Η
Θ = Θ Θ = Θ
Ι = Ι Ι = Ι
Κ = Κ Κ = Κ
Λ = Λ Λ = Λ
Ξ = Ξ Ξ = Ξ
Π = Π Π = Π
Σ = Σ Σ = Σ
Τ = Τ Τ = Τ
Υ = Υ Υ = Υ
Φ = Φ Φ = Φ
Χ = Χ Χ = Χ
Ψ = Ψ Ψ = Ψ
Ω = Ω Ω = Ω
α = α α = α
β = β β = β
γ = γ γ = γ
δ = δ δ = δ
ε = ε ε = ε
ζ = ζ ζ = ζ
η = η η = η
θ = θ θ = θ
ι = ι ι = ι
κ = κ κ = κ
λ = λ λ = λ
μ = μ μ = μ
ν = ν ν = ν
ξ = ξ ξ = ξ
π = π π = π
ρ = ρ ρ = ρ
ς = ς ς = ς
σ = σ σ = σ
τ = τ τ = τ
υ = υ υ = υ
φ = φ φ = φ
χ = χ χ = χ
ψ = ψ ψ = ψ
ω = ω ω = ω
ϑ = ϑ ϑ = ϑ
ϒ = ϒ ϒ = ϒ
ϖ = ϖ ϖ = ϖ
• = • • = • bullet
… = … … = …
′ = ′ ′ = ′
″ = ″ ″ = ″
‾ = ‾ ‾ = ‾
⁄ = ⁄ ⁄ = ⁄

Letterlike Symbols

℘ = ℘ ℘ = ℘
ℑ = ℑ ℑ = ℑ
ℜ = ℜ ℜ = ℜ
™ = ™ ™ = ™
ℵ = ℵ ℵ = ℵ
← = ← ← = ←
→ = → → = →
↓ = ↓ ↓ = ↓
↔ = ↔ ↔ = ↔ left right arrow
↵ = ↵ ↵ = ↵ downwards arrow with corner leftwards
⇐ = ⇐ ⇐ = ⇐ leftwards double arrow,
⇑ = ⇑ ⇑ = ⇑ upwards double arrow
⇒ = ⇒ ⇒ = ⇒ rightwards double arrow
⇓ = ⇓ ⇓ = ⇓ downwards double arrow
⇔ = ⇔ ⇔ = ⇔ left right double arrow

Mathematical Operators

∀ = ∀ ∀ = ∀ for all
∂ = ∂ ∂ = ∂ partial differential
∃ = ∃ ∃ = ∃ there exists
∅ = ∅ ∅ = ∅ empty set = null set = diameter
∇ = ∇ ∇ = ∇ nabla = backward difference, U+2207 ISOtech
∈ = ∈ ∈ = ∈ element of, U+2208 ISOtech
∉ = ∉ ∉ = ∉ not an element of, U+2209 ISOtech
∋ = ∋ ∋ = ∋ contains as member, U+220B ISOtech
∏ = ∏ ∏ = ∏
∑ = ∑ ∑ = ∑
− = − − = − minus sign
∗ = ∗ ∗ = ∗ asterisk operator,
√ = √ √ = √ square root = radical sign,
∝ = ∝ ∝ = ∝ proportional to,
∞ = ∞ ∞ = ∞ infinity,
∠ = ∠ ∠ = ∠ angle,
∧ = ∧ ∧ = ∧ logical and = wedge,
∨ = ∨ ∨ = ∨ logical or = vee,
∩ = ∩ ∩ = ∩ intersection = cap,
∪ = ∪ ∪ = ∪ union = cup,
∫ = ∫ ∫ = ∫ integral,
∴ = ∴ ∴ = ∴ therefore,
∼ = ∼ ∼ = ∼ tilde operator = varies with = similar to,
≅ = ≅ ≅ = ≅ approximately equal to,
≈ = ≈ ≈ = ≈ almost equal to = asymptotic to,
≠ = ≠ ≠ = ≠ not equal to,
≡ = ≡ ≡ = ≡ identical to,
≤ = ≤ ≤ = ≤ less-than or equal to,
≥ = ≥ ≥ = ≥ greater-than or equal to,
⊂ = ⊂ ⊂ = ⊂ subset of,
⊃ = ⊃ ⊃ = ⊃ superset of,
⊄ = ⊄ ⊄ = ⊄ not a subset of,
⊆ = ⊆ ⊆ = ⊆ subset of or equal to,
⊇ = ⊇ ⊇ = ⊇ superset of or equal to,
⊕ = ⊕ ⊕ = ⊕ circled plus = direct sum,
⊗ = ⊗ ⊗ = ⊗ circled times = vector product,
⊥ = ⊥ ⊥ = ⊥ up tack = orthogonal to = perpendicular,
⋅ = ⋅ ⋅ = ⋅ dot operator,

Miscellaneous Technical

⌈ = ⌈ ⌈ = ⌈ left ceiling = apl upstile,
⌉ = ⌉ ⌉ = ⌉ right ceiling,
⌊ = ⌊ ⌊ = ⌊ left floor = apl downstile,
⌋ = ⌋ ⌋ = ⌋ right floor,
⟨ = ⟨ 〈 = 〈 left-pointing angle bracket = bra,
⟩ = ⟩ 〉 = 〉 right-pointing angle bracket = ket,

Geometric Shapes

◊ = ◊ ◊ = ◊ lozenge, U+25CA ISOpub
Miscellaneous Symbols
♠ = ♠ ♠ = ♠ black spade suit, U+2660 ISOpub
black here seems to mean filled as opposed to hollow
♣ = ♣ ♣ = ♣ black club suit = shamrock, U+2663 ISOpub
♥ = ♥ ♥ = ♥ black heart suit = valentine, U+2665 ISOpub
♦ = ♦ ♦ = ♦ black diamond suit, U+2666 ISOpub

Ky hieu hoa hoc

δ+

δ-

±

Fe2+ + H2O2 → Fe3+ + *OH + OH– (1)
Fe3+ + H2O2 → Fe2+ + *HO2 + H+ (2)
*OH + Fe2+ → OH- + Fe3+ (3)
*OH + H2O2 → H2O + *HO2 (4)
Fe2+ + *HO2  → Fe3+ + HO2- (5)
Fe3+ + *HO2  → Fe2+ + O2 + H+ (6)
*HO2 + *HO2 → H2O2 + O2 (7)
————————–

  1. CO2                    CO<sub>2</sub> 
  2. H2O H<sub>2</sub>O
  3. Na2CO3              Na<sub>2</sub>CO<sub>3</sub>
  4. CaCO3                  CaCO<sub>3</sub>
  5. BaSO4                  BaSO<sub>4</sub>
  6. NH4HSO4                 NH<sub>4</sub>HSO<sub>4</sub>
  7. Ba(OH)2                 Ba(OH)<sub>2</sub>
  8. BaCl2                   BaCl<sub>2</sub>
  9. H2SO4                   H<sub>2</sub>SO<sub>4</sub>
  10. NaHSO4                 NaHSO<sub>4</sub>
  11. KHCO3                  KHCO<sub>3</sub>
  12. Mg(HCO3)2           Mg(HCO<sub>3</sub>)<sub>2</sub>
  14. Na2SO3                 Na<sub>2</sub>SO<sub>3</sub>
  15. Ba(HCO3)2         Ba(HCO<sub>3</sub>)<sub>2</sub>
  16. H2SO4               H<sub>2</sub>SO<sub>4</sub>
  17. MgCO3            MgCO<sub>3</sub>
  18. BaCO3            BaCO<sub>3</sub>
  19. FeCO3             FeCO<sub>3</sub>
  20. Al2O3           Al<sub>2</sub>O<sub>3</sub>
  21. SiO2             SiO<sub>2</sub>
  22. Fe3O4            Fe<sub>3</sub>O<sub>4</sub>
  23. HNO3        HNO<sub>3</sub>
  24. AlCl3               AlCl<sub>3</sub>
  25. FeCl3               FeCl<sub>3</sub>    
  26. NH4Cl              NH<sub>4</sub>Cl
  27. (NH4)SO4           (NH<sub>4</sub>)SO<sub>4</sub>
  28. FeSO4                FeSO<sub>4</sub>
  29. Fe2(SO4)3              Fe<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub>
  30. MgSO4                  MgSO<sub>4</sub>
  31. Fe2O3                  Fe<sub>2</sub>O<sub>3</sub> 
  32. CuCl2                 CuCl<sub>2</sub>
  33. Na+                  Na<sup>+</sup>

    34.    

  34. NH4+,            NH<sub>4</sub><sup>+</sup>
  35. Ba+,            Ba<sup>+</sup>
  36.  Ca2+              Ca<sup>2+</sup>
  37.  Fe3+,                 Fe<sup>3+</sup>, 
  38.  Al3+                     Al<sup>3+</sup> 
  39. , K+,                K<sup>+</sup>
  40. Mg2+              Mg<sup>2+</sup>
  41. , Cu2+              Cu<sup>2+</sup>
  42. , CO32+           CO<sub>3</sub><sup>2+</sup>
  43. , PO42+,            PO<sub>4</sub><sup>2+</sup>
  44. Cl-,              Cl<sup>-</sup>
  45.  NO3-,            NO<sub>3</sub><sup>-</sup>
  46. SO42-,             SO<sub>4</sub><sup>2-</sup>,
  48. Br-                Br<sup>-</sup>
  49. CO32-        CO<sub>3</sub><sup>2-</sup>
  51. CO32-
  52. CO<sub>3</sub><sup>2-</sup>
  53. CaCl2
  54. CaCl<sub>2</sub>
  55. ZnCl2
  56. ZnCl<sub>2</sub>
  57. MgCl2
  58. MgCl<sub>2</sub>
  59. MgCl2
  60. MgCl<sub>2</sub>
  61. Fe2+
  62. Fe<sup>2+</sup>
  63. NH4HCO3
  64. NH<sub>4</sub>HCO<sub>3</sub>
  65. (NH4)2CO3
  66. (NH<sub>4</sub>)<sub>2</sub>CO<sub>3</sub>
  67. NaHCO3
  68. NaHCO<sub>3</sub>
  69. NH4NO3
  70. NH<sub>4</sub>NO<sub>3</sub>
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