// chemistry
⚗ Chemistry
Concentration, colligative properties, kinetics, equilibrium, and electrochemistry.
Periodic Table
Elements Explorer 1
Interactive Periodic Table
118 elements - click to explore
Chemical Kinetics
Rate Laws 1
First Order Rate Law
k = \frac{2.303}{t}\,\log\frac{[A]₀}{[A]}
Reaction Rate 1
Rate of Reaction
\text{Rate} = \frac{-Δ[R]}{Δ t}
Temperature Dependence 1
Arrhenius Equation
k = A\,e⁻Eₐ / (R\,T)
Colligative Properties
Dissociation 1
van 't Hoff Factor (i)
i = \frac{\text{observed effect}}{\text{calculated effect}}
Freezing & Boiling Points 2
Depression in Freezing Point (ΔT_f)
Δ Tf = Kf × m
Elevation in Boiling Point (ΔT_b)
ΔT_b = K_b × m
Gas Solubility 1
Henry's Law
P = kH × x
Osmosis 1
Osmotic Pressure (π = CRT)
π = C × R × T
Vapour Pressure 1
Raoult's Law
PA = xA × PA\circ
Electrochemistry
Cell Potential 1
Nernst Equation
E = E\circ - \frac{0.0591}{n}\log Q
Electrolysis 1
Faraday's Law of Electrolysis
W = \frac{E\,I\,t}{96500}
Thermodynamics 1
Gibbs Free Energy (ΔG)
Δ G = Δ H - TΔ S
Equilibrium & Acids/Bases
Acids & Bases 2
Ionic Product of Water (K_w)
Kw = [H^+][OH^-] = 10⁻¹⁴
pH Calculator
\text{pH} = -\log[H^+]
Equilibrium 2
Equilibrium Constant (K_c)
Kᴄ = \frac{[\text{Products}]}{[\text{Reactants}]}
Solubility Product (K_sp)
Ksp = [A^+][B^-]
Solutions & Concentration
Concentration Units 4
Molality (m)
m = \frac{n × 1000}{W}
Molarity (M)
M = \frac{w × 1000}{Mw × V}
Mole Fraction (x)
xA = \frac{nA}{nA + nB}
Normality (N)
N = \frac{w × 1000}{E × V}
Thermochemistry
Reaction Enthalpy 1
Hess's Law
Δ H = Σ Δ Hproduᴄts - Σ Δ Hreₐᴄtₐnts