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Formulas

Chemistry

Showing formulas of Chemistry

Showing 16 of 40 formulas Page 2 of 2

pH Definition

Chemistry → Acid-Base Chemistry → pH and pOH → Acidity Scale
$$\text{pH} = -\log_{10}[\text{H}^+]$$
Measure of hydrogen ion concentration in solution.
📖 Chemistry 📚 pH and pOH

Equilibrium Constant

Chemistry → Chemical Equilibrium → Equilibrium Constants → Law Of Mass Action
$$K_c = \frac{[\text{C}]^c[\text{D}]^d}{[\text{A}]^a[\text{B}]^b}$$
Ratio of product to reactant concentrations at equilibrium for reaction $aA + bB \rightleftharpoons cC + dD$.
📖 Chemistry 📚 Equilibrium Constants

First Order Reaction Kinetics

Chemistry → Chemical Kinetics → Reaction Rates → Integrated Rate Laws
$$[A]_t = [A]_0 e^{-kt}$$
Concentration of reactant decreases exponentially for first-order reaction.
📖 Chemistry 📚 Reaction Rates

Second Order Reaction (One Reactant)

Chemistry → Chemical Kinetics → Reaction Rates → Integrated Rate Laws
$$\frac{1}{[A]_t} = \frac{1}{[A]_0} + kt$$
Reciprocal concentration increases linearly for second-order reaction.
📖 Chemistry 📚 Reaction Rates

Activation Energy (Arrhenius Form)

Chemistry → Chemical Kinetics → Temperature Dependence → Arrhenius Equation
$$k = A e^{-E_a/(RT)}$$
Temperature dependence of rate constant.
📖 Chemistry 📚 Temperature Dependence

Rate Law (General)

Chemistry → Physical Chemistry → Chemical Kinetics → Reaction Rate
$$Rate = k[A]^m [B]^n$$
An equation that links the initial or forward reaction rate with the concentrations or pressures of the reactants and constant parameters.
📖 Chemistry 📚 Chemical Kinetics

Hess's Law

Chemistry → Thermodynamics → Thermochemistry → Enthalpy
$$\Delta H_{\text{rxn}} = \sum \Delta H_f(\text{products}) - \sum \Delta H_f(\text{reactants})$$
Total enthalpy change for a reaction is the same regardless of the path taken.
📖 Chemistry 📚 Thermochemistry

Phase Rule

Chemistry → Physical Chemistry → Chemical Equilibrium → Phase Equilibrium
$$F = C - P + 2$$
Relates the number of degrees of freedom, components, and phases in a system at equilibrium.
📖 Chemistry 📚 Chemical Equilibrium

Molar Conductivity

Chemistry → Electrochemistry → Electrochemistry → Conductance
$$\Lambda_m = \frac{\kappa}{C}$$
The conducting power of all the ions produced by dissolving one mole of electrolyte in solution.
📖 Chemistry 📚 Electrochemistry

Standard Heat of Formation

Chemistry → Thermodynamics → Thermochemistry → Enthalpy
$$\Delta H_f^\circ = H_{\text{compound}} - \sum H_{\text{elements}}$$
Enthalpy change when one mole of a compound is formed from its elements in their standard states.
📖 Chemistry 📚 Thermochemistry

Standard Cell Potential (Non-Standard)

Chemistry → Electrochemistry → Nernst Equation → Voltage
$$E_{\text{cell}} = E^\circ - \frac{0.0591}{n} \log Q$$
Simplified Nernst equation for calculating cell voltage at $298 K$ using base-10 log.
📖 Chemistry 📚 Nernst Equation

Molar Volume of Ideal Gas

Chemistry → Physical Chemistry → Gases → Molar Properties
$$V_m = \frac{RT}{P}$$
The volume occupied by one mole of a substance (gas) at a given temperature and pressure.
📖 Chemistry 📚 Gases

Osmotic Pressure

Chemistry → Physical Chemistry → Solutions → Colligative Properties
$$\pi = iCRT$$
The pressure required to stop the flow of solvent through a semipermeable membrane.
📖 Chemistry 📚 Solutions

pH of a Buffer Solution (Henderson-Hasselbalch)

Chemistry → Physical Chemistry → Ionic Equilibrium → Buffers
$$pH = pK_a + \log\left(\frac{[Salt]}{[Acid]}\right)$$,
Used to calculate the pH of a buffer solution consisting of a weak acid and its conjugate base.
📖 Chemistry 📚 Ionic Equilibrium

Standard Entropy Change

Chemistry → Thermodynamics → Chemical Thermodynamics → Entropy
$$\Delta S^\circ = \sum S^\circ(\text{products}) - \sum S^\circ(\text{reactants})$$
Calculates the change in disorder during a chemical reaction using standard entropy values.
📖 Chemistry 📚 Chemical Thermodynamics

First Law of Electrolysis (Faraday)

Chemistry → Electrochemistry → Electrolysis → Quantitative Electrolysis
$$m = ZIt$$
The mass of a substance deposited at an electrode is directly proportional to the quantity of electricity passed through the electrolyte.
📖 Chemistry 📚 Electrolysis
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