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  THERMODYNAMICS – CLASS 11 CHEMISTRY  Thermodynamics – Learn the laws of energy, heat, work, enthalpy, entropy and Gibbs free energy for NEET and JEE. Introduction Thermodynamics is the branch of science that deals with heat, work, energy and their transformations. In Chemistry, thermodynamics helps us understand why chemical reactions release or absorb energy, how energy changes occur during physical processes, and whether a reaction is thermodynamically favourable. Examples: Burning of fuels releases heat. Melting of ice absorbs heat. Expansion of gases involves work. Chemical reactions involve changes in internal energy and enthalpy. 1. Basic Terminology of Thermodynamics 1.1 System A system is the part of the universe selected for thermodynamic study. Example: Gas enclosed in a cylinder. 1.2 Surroundings Everything outside the system that can interact with it is called the surroundings. 1.3 Boundary The real or imagi...

 Dr.Sanjaykumar Pawar  GASEOUS STATE – COMPLETE BEGINNER NOTES  Gaseous State – Understand gas laws, molecular motion, ideal gas behaviour and kinetic theory with easy Class 11 Chemistry notes. Introduction to Gaseous State The gaseous state is one of the three fundamental states of matter. Gases have no fixed shape or volume. They occupy the entire container in which they are placed. Gas molecules are continuously moving in random directions. They collide with one another and with the walls of the container. The behaviour of gases can be explained using gas laws and the kinetic molecular theory. Learning Objectives After completing this lesson, students will be able to: Understand the fundamental gas laws. Apply the ideal gas equation. Calculate molecular speed and kinetic energy. Understand real gases and Van der Waals equation. Explain critical temperature and pressure. Calculate mean free path and collision frequency. Solve basic numerical probl...

 - Dr.Sanjaykumar Pawar  Sub-Atomic Particles and Atomic Models – Class 11, NEET Notes  Sub-Atomic Particles and Atomic Models explained through simple visual diagrams for Class 11, NEET 2027 and competitive exam preparation. Sub-Atomic Particles & Atomic Models | NEET Physics/Chemistry Practice Sub-Atomic Particles & Atomic Models Complete NEET Practice & Revision Page PYQ Pattern Next Level Ultra-Hard Numericals 45-Question Mock Test Designed for NEET aspirants who want to master sub-atomic particles, atomic models, isotopes, isobars, isotones and isoelectronic species. Introduction Atoms are made up of smaller particles called sub-atomic particles . The three fundamental particles studied at the elementary level are electrons, protons and neutrons. Understanding these particles is essential for solving NEET questions related to atomic structure, ions, isotopes, isobars, isotones, isoelectronic species and atomic mo...