NEET 2027 cheat sheet for Physical Chemistry! 📱 Practice 1 Lakh+ PYQs on ExamBhai.com! - Free Study Material

NEET 2027: Physical Chemistry Core Concepts & Formulas

Physical Chemistry requires a strong grasp of conceptual fundamentals, numerical problem-solving skills, and key mathematical relationships. This structured guide outlines essential core formulas across core NEET physical chemistry chapters.

1. Some Basic Concepts of Chemistry

• Mole Concept: \(\text{Number of moles } (n) = \frac{\text{Mass (g)}}{\text{Molar Mass (g/mol)}} = \frac{\text{Volume at STP (L)}}{22.4}\)
• Molarity (M) & Molality (m): \(M = \frac{n_{\text{solute}}}{V_{\text{solution (L)}}}\), \(m = \frac{n_{\text{solute}}}{W_{\text{solvent (kg)}}}\)

2. Structure of Atom

• Bohr's Radius & Energy: \(r_n = 0.529 \times \frac{n^2}{Z} \text{ À}\), \(E_n = -13.6 \times \frac{Z^2}{n^2} \text{ eV}\)
• de Broglie Wavelength: \(\lambda = \frac{h}{p} = \frac{h}{m v}\)

3. Chemical Thermodynamics

• First Law of Thermodynamics: \(\Delta U = q + w\)
• Work Done in Reversible Isothermal Expansion: \(w = -2.303 nRT \log\bigl(\frac{V_2}{V_1}\bigr)\)
• Gibbs Free Energy & Spontaneity: \(\Delta G = \Delta H - T\Delta S\); Spontaneous when \(\Delta G < 0\)

4. Chemical & Ionic Equilibrium

• Equilibrium Constant Relationship: \(K_p = K_c (RT)^{\Delta n_g}\)
• pH of Buffer Solutions (Henderson-Hasselbalch Equation): \(\text{pH} = \text{p}K_a + \log\bigl(\frac{[\text{Salt}]}{[\text{Acid}]}\bigr)\)

5. Electrochemistry & Kinetics

• Nernst Equation: \(E_{\text{cell}} = E^0_{\text{cell}} - \frac{0.0591}{n} \log Q\) (at \(298\text{ K}\))
• First-Order Rate Law: \(k = \frac{2.303}{t} \log\bigl(\frac{[A]_0}{[A]_t}\bigr)\), \(t_{1/2} = \frac{0.693}{k}\)

Molecular Structure Spatial Representation

In physical chemistry organic applications, understanding spatial orientation is vital. Consider the given below structure of a substituted alkene system exhibiting geometrical isomerism:

```smiles C/C=C/C(=O)O ```