Chapter 1: Some Basic Concepts of Chemistry (CBSE Class 11)

Introduction

• The branch of science that studies the preparations, properties, structures and reactions of material substances is called chemistry.
• Chemistry deals with the composition, structure, property and interaction of matter and is useful to humans in daily life. these aspects can be best described and understood in terms of basic constituents of matter i.e., atoms and molecules. That is why, chemistry is also called as the science of atoms and molecules.

Importance of Chemistry

Nature of Matter

Properties of Matter and Their Measurement

Uncertainty in Measurement

Dimensional Analysis

Laws of Chemical Combinations

Daltons Atomic Theory

Atomic and Molecular Masses

Mole Concept and Molar Masses

Percentage Composition

Stoichiometry and Stoichiometric Calculations