Basic Concepts of Chemistry: Handwritten Notes PDF for NEET/JEE

Mastering the fundamentals is the first step toward cracking competitive exams like NEET and JEE. These Basic Chemistry Handwritten Notes are designed to simplify complex introductory topics, providing you with a solid foundation in Physical, Inorganic, and Organic chemistry.

1. Introduction to the World of Chemistry

Chemistry is defined as the branch of science dealing with the composition, structure, and properties of matter[cite: 2]. Often referred to as the "Central Science," it explains how atoms interact to form the world around us. Antoine Laurent Lavoisier is recognized as the Father of Chemistry for his pioneering work[cite: 2].

The Three Pillars: Branches of Chemistry

According to the notes, chemistry is split into three main domains[cite: 2]:

• Physical Chemistry: Studies the behavior of matter at atomic and molecular levels[cite: 2].
• Inorganic Chemistry: Deals with elements and compounds excluding carbon-based structures[cite: 2].
• Organic Chemistry: Focuses specifically on carbon and its vast array of compounds[cite: 2].

2. Periodic Table Tricks: "Ha-Li-Na-Ki-Rub-Se-Fariyad"

Memorizing 118 elements is daunting, but these notes provide unique mnemonics[cite: 2]. For example, the Alkali Metals (Group 1) can be remembered using the phrase "है ली ना की रब से फरियाद" (H, Li, Na, K, Rb, Cs, Fr)[cite: 2]. Similarly, the Halogen Family (Group 17) is simplified as "फिर कल बाहर आयी आन्टी" (F, Cl, Br, I, At)[cite: 2].

3. Atomic Representation and Calculations

An atom is the smallest part of an element participating in a chemical reaction[cite: 2]. It is represented as $zX^{A}$, where:

• Z: Atomic number (Number of protons)[cite: 2].
• A: Mass number (Protons + Neutrons)[cite: 2].
• Neutrons: Calculated as $A - Z$[cite: 2].

Mastering Molecular Mass

Calculating molecular mass is essential for stoichiometry. The PDF provides a step-by-step guide for common compounds[cite: 2]:

• Water ($H_2O$): $2(1) + 16 = 18$[cite: 2].
• Sulphuric Acid ($H_2SO_4$): $2(1) + 32 + 4(16) = 98$[cite: 2].
• Glucose ($C_6H_{12}O_6$): $12(6) + 1(12) + 16(6) = 180$[cite: 2].
• Urea ($NH_2CONH_2$): 60[cite: 2].

4. Valency and Polyatomic Radicals

Valency determines how atoms bond. The notes provide an extensive chart of ions[cite: 2]:

• Cations: $Na^{+1}, Mg^{+2}, Al^{+3}$[cite: 2].
• Anions: $Cl^{-1}, O^{-2}, N^{-3}$[cite: 2].
• Radicals: Sulphate ($SO_4^{2-}$), Nitrate ($NO_3^-$), and Phosphate ($PO_4^{3-}$)[cite: 2].

5. Scientific Notation & Unit Conversions

In Chemistry, we often deal with extreme numbers. Scientific notation represents these as $N \times 10^n$[cite: 2]. For instance, $0.00006$ becomes $6.0 \times 10^{-5}$[cite: 2].

Crucial Conversions for Numericals

Accurate unit conversion is the difference between a correct and incorrect answer in NEET[cite: 2]:

• Pressure: $1 \text{ atm} = 760 \text{ mmHg} = 760 \text{ torr}$[cite: 2].
• Temperature: $K = °C + 273.15$ and $°F = \frac{9}{5}°C + 32$[cite: 2].
• Energy: $1 \text{ calorie} = 4.18 \text{ Joules}$[cite: 2].