Chemistry teacher

 -Dr.Sanjaykumar Pawar  CBSE Class 11 Chemistry – Chapter 1  Complete NCERT Class 11 Chemistry Chapter 1 exercise solutions , covering significant figures, limiting reagents, stoichiometry, mole concept and chemical calculations. Some Basic Concepts of Chemistry NCERT Exercise Questions and Solutions (1.1–1.19) Answer Writing Format: All solutions are presented in a systematic CBSE Board examination format, including formulas, substitutions, calculations and final answers with appropriate units. Question 1.1 – Calculate the Molar Mass Calculate the molar mass of the following: (i) H 2 O (ii) CO 2 (iii) CH 4 Solution: (i) Water (H 2 O) Atomic masses: H = 1.008 g mol -1 O = 16.00 g mol -1 Molar mass of H₂O = 2(1.008) + 16.00 = 18.016 g mol⁻¹ (ii) Carbon dioxide (CO 2 ) Molar mass of CO₂ = 12.01 + 2(16.00) = 44.01 g mol⁻¹ (iii) Methane (CH 4 ) Molar mass of CH₄ = 12.01 + 4(1.008) = 16.042 g mol⁻¹ Final Answers: (i) H₂O = 18.016 g...

 - Dr.Sanjaykumar Pawar    Chemistry Teacher IQ: free notes, MCQs and mock tests for CBSE, NEET and JEE chemistry. Atomic Models for NEET: Thomson Plum Pudding & Rutherford Nuclear Model Explained Atomic Models for NEET: Thomson Plum Pudding & Rutherford Nuclear Model Explained Introduction Thomson Rutherford Formulas Numericals Comparison Practice FAQs Introduction What are atomic models? An atomic model is a scientific representation of the internal structure of an atom : how protons, neutrons and electrons are arranged inside it. Atoms are too small to observe directly, so scientists proposed models based on the experimental evidence available at the time. Think of a sealed box. You can't see inside, but by shaking it, weighing it and listening, you can guess what is in it. That is what Thomson, Rutherford and later Bohr did with the atom. Why is this topic important for NEET? Atomic models are the foundation of the "Structure of Atom...

 - Dr.Sanjaykumar Pawar   CBSE Chemistry Notes, MCQs & Questions | Chemistry Teacher IQ  Chemistry Teacher IQ – Complete Chemistry Learning Resources for CBSE, NEET & JEE Aspirants Chemical Bonding - Topper's Detailed Notes ⚛️ CHEMICAL BONDING Topper's Detailed Notes VSEPR Theory • Molecular Geometry • Bond Angles • Electronegativity • Bond Dipoles • Molecular Dipole Moment Class 11/12 • NEET • JEE Foundation 1. Why Do Atoms Form Chemical Bonds? Atoms form chemical bonds because a bonded system can achieve a more stable electronic arrangement. The electrons involved in bonding are mainly the valence electrons . For many main-group elements, stability is associated with achieving a noble-gas-like valence-shell configuration. This is commonly described using the octet rule , although the octet rule has important exceptions. Core idea: Chemical bonding is fundamentally an interaction involving electrons and nuclei. The arrangement of these interac...