NCERT Solutions for Class 11 Chemistry, Chapter 1 - Some Basic Concepts of Chemistry

In the first chapter of Chemistry, you will study about the importance of chemistry not only in our day to day lives but also towards the development of our country. You will begin with the study of what is matter, followed by various states of matter, different scientific notations and the International System of Units. You will also learn about various laws of chemical combinations, importance of atomic mass, average atomic mass, molecular mass, mole and molar mass. You will also come across empirical formula and molecular formula for a compound and also perform the stoichiometric calculations.

Thus, an in-depth study of Class 11 Chemistry NCERT Solutions Chapter 1 will give you an excellent introduction to the dynamic subject of Chemistry.

Let’s take a look at topics and sub-topics of Class 11 Chemistry Chapter 1, Some Basic Concepts of Chemistry.

1.1 Importance of Chemistry

1.2 Nature of Matter

1.2.1 States of Matter

1.2.2 Classification of Matter

1.3 Properties of Matter and their Measurement

1.3.1 Physical and Chemical Properties

1.3.2 Measurement of physical properties

1.3.3 The International System of Units (SI)

1.3.4 Mass and weight

1.3.5 Volume

1.3.6 Density

1.3.7 Temperature

1.4 Uncertainty in Measurement

1.4.1 Scientific Notation

1.4.2 Significant Figures

1.4.3 Dimensional Analysis

1.5 Laws of Chemical Combinations

1.5.1 Law of conservation of mass

1.5.2 Law of definite proportions

1.5.3 Law of Multiple Proportions

1.5.4 Gay Lussac’s Law of Gaseous Volumes

1.5.5 Avogadro’s Law

1.6 Dalton’s Atomic Theory

1.7 Atomic and Molecular Masses

1.7.1 Atomic Mass

1.7.2 Average Atomic Mass

1.7.3 Molecular Mass

1.7.4 Formula Mass

1.8 Mole Concept and Molar Masses

1.9 Percentage Composition

1.9.1 Empirical Formula for Molecular Formula

1.10 Stoichiometry and Stoichiometric Calculations

1.10.1Limiting Reagent

1.10.2 Reactions in Solutions

In Class 11 Chemistry Chapter 1, you will learn – 

Section 1.1 – In this section, you’ll learn how chemistry plays a crucial role in various fields of science, weather conditions, in the manufacturing industry such as manufacturing of fertilizers, chemicals, salts, soaps, detergents, polymers, and more. Chemistry also plays a significant role in computer operations, development of the brain, pharmaceutical companies, understanding of metals, food, healthcare, biochemistry, dealing with environmental issues, and so on.

Section 1.2 – In this section, you will study what matter is, different states of matter, classification of matter, what is a mixture, various types of mixtures, what are pure substances, elements, compounds and more.

Section 1.3 – In this section, you’ll acquire knowledge about physical and chemical properties of matter, how to measure physical properties, the International System of Units (SI), base physical quantities and their units, definitions of SI Base Units, prefixes used in the SI system, definition and explanation of mass, weight, volume, density, temperature with their respective formulae.

Section 1.4 – In this section, you’ll learn how to measure uncertain and experimental data using various methods and means such as scientific notation, significant figures and dimensional analysis. These methods include mathematical calculations like addition, subtraction, multiplication and division.

Section 1.5 – In this section, you’ll study about the laws of chemical combinations such as the law of conservation of mass, the law of definite proportions, the law of multiple proportions, Gay Lussac’s Law of Gaseous Volumes and Avogadro’s Law.

Section 1.6 – In this section, you’ll acquire knowledge about Dalton’s atomic theory (published in 1808 in ‘A New System of Chemical Philosophy’) and various propositions made by him.

Section 1.7 – In this section, you’ll study what you mean by atomic and molecular masses. You will also learn what isotopes, atomic mass unit, unified mass, average atomic mass and formula mass are.

Section 1.8 – In this section, you’ll learn what a mole is all about, how it is calculated, what is Avogadro constant, molar mass and molar masses of water and sodium chloride.

Section 1.9 – In this section, you’ll study what Empirical Formula and Molecular is Formula and conversion of mass per cent to grams.

Section 1.10 – In this section, you’ll come across ‘stoichiometry’ and stoichiometric calculations. You’ll also learn what Limiting Reagent is and how to balance a chemical equation. Besides, you will also learn various ways of expressing the amount of substance present in its given volume using Mass per cent or weight per cent (w/w %), Mole fraction, Molarity and Molality.

In this chapter, you are provided with several examples with their solutions for a clear understanding of Some Basic Concepts of Chemistry. To know more about NCERT Solutions for Class 11 Chemistry Chapter 1, you should explore the exercises mentioned in this chapter. You can also download the NCERT Solutions for Class 11 Chemistry Chapter 1 PDF, solved by our science experts.