Class 11 Chemistry Chapter 1 Notes – Some Basic Concepts of Chemistry Notes PDF Download

class 11 chemistry chapter 1 notes

Class 11 Chemistry Chapter 1 Notes: Some basic concepts of chemistry is the first and one of the most important chapters of the book. Sometimes it becomes very difficult for students to understand the complicated terms and formulas. That’s why we have made some basic concepts of chemistry class 11th notes in a very simple and easy to understand way. Students can also download a free PDF of class 11 chemistry chapter 1 notes on our website. According to the level of class 11, these notes are more than enough for your chemistry exam preparation. Read these Class 11 Chemistry ch 1 notes properly so that you can score good marks in exams.

Some Basic Concepts of Chemistry Class 11 Chapter 1 Notes PDF Download

If you want to study offline then you can download this class 11th chemistry chapter 1 notes PDF.

Read Class 11 Chemistry Chapter 1 Notes of Some Basic Concepts of Chemistry

Chemistry is a chemical science that is suggested concerning the “Focal Science” as it interconnects geology, science, intrinsic science, and genuine science to one another. Older style Indians pondered different contemplations from science even before it arose as a discipline. In science, one of the center key concepts is matter – it is a substance that consumes genuine space and has inertness. Class 11 chemistry chapter 1 describes the basic concepts of Chemistry with the Chemistry Laws of science. There are three conditions of issue viz strong, gas, fluid. Anyone can also collect matter into mixes, blends, or parts.

Three States of Matter with Examples 

There are three conditions of the issue, and under is the depiction of different conditions of issue: 

1. Solids 

  • The strong state is one of the key conditions of the issue. 
  • Solids contrast from fluids and gases by the characteristic of inflexible nature. 
  • The particles of solids are unfalteringly stuffed thinking about solid intermolecular powers; they just flounder about their mean positions. 
  • Whereas, fluids and gases have the property of straightforwardness and can for certain streams. 
  • Solids can be portrayed as the condition of issue which has an unequivocal shape and volume and has an unflinching arrangement. 
  • Solids have the least compressibility and warm development. 

For Instance: Iron (Fe) 

2. Fluids 

  • The particles in a fluid are stuffed unequivocally because of fragile intermolecular powers. 
  • These powers are more helpless than solids yet more grounded than that of gases. 
  • There is a lot of room in the particles of fluids which improves their streaming breaking point. 
  • Liquids can without a truly wonderful stretch expand the state of a vessel, and they have an authentic volume. 
  • Conversion of solids into fluids happens when we increment the temperature of solids to a point where solids start to unwind. 
  • Generally, the thickness of fluid lies between the thickness of solids and gases. The compressibility and warm increase of fluids are scarcely higher than that of solids. 

For Instance: Water (H2O) 

3. Gases 

  • In this condition of issue, distances between the atoms are giant (intermolecular distance is in the degree of 10−7–10−5cm10−7–10−5cm). 
  • The intermolecular powers experienced between them are irrelevant. 
  • Thus, translatory, rotatory, and vibratory advancements are seen conspicuously in gases. 
  • Gases don’t have any real shape or volume. 
  • They in addition have high compressibility and a warm new development. 

For Instance: Oxygen (O2) 

Also Read:- CBSE Class 11 Chemistry Syllabus

Laws Of Chemical Combination 

Five crucial laws direct the substance blend of parts. 

Law of Conservation of Mass

It conveys that during a substance response, the mass of the things and reactants will dependably be something very similar. 

What is the Law of Conservation of Mass? 

The law of safety of mass imparts that 

“The mass in a separated framework can’t be made nor be obliterated now can be changed starting with one development then onto the accompanying”. 

As shown by the law of security of mass, the mass of the reactants should be similar to the mass of the things for a low-energy thermodynamic cycle. 

There are a couple of presumptions from old-style mechanics which depict mass protection. Later the law of safety of mass was changed with the assistance of quantum mechanics and surprising relativity that energy and mass are one defended total. In 1789, Antoine Laurent Lavoisier found the law of safety of mass. 

Law of Definite Proportions 

It imparts that each designed compound will contain a fixed and consistent degree by mass of its constituent parts. Joseph Proust proposed this law. 

What is the Law of Constant Proportions? 

The law of predictable degrees imparts that substance compounds are involved parts that are open to a real degree by mass. This recommends that any unadulterated outline of a compound, paying little brain to the source, will dependably include the parts that are available to an equivalent degree by mass. For instance, unadulterated water will dependably contain hydrogen and oxygen in a suitable mass degree (a gram of water commonly includes 0.11 grams of hydrogen and 0.88 grams of oxygen, the degree is 1:8). 

The law of steady degrees is regularly implied as Proust’s law or as the law of specific degrees. A blueprint depicting the mass degree of parts in a few blends is given underneath. The degree of the number of pieces of each part is given under the mass degree. For instance, in a nitrogen dioxide (NO2) atom, the degree of the measure of nitrogen and oxygen particles is 1:2 in any case the mass degree is 14:32 (or 7:16). 

Law of Multiple Proportions 

It is a standard of stoichiometry point by point by John Dalton. 

What Is Stoichiometry? 

Stoichiometry is a fundamental piece of science that recalls the relationship among things and reactants for a substance response and different words, stoichiometry deduces the appraisal of parts. To get a handle on Stoichiometric appraisals, appreciate the relationship among reactants and things occurring in a produced response. For a response to being changed, the various sides of the situation should have a tantamount number of parts. To change the measure of each part on the various sides of the response, we utilize stoichiometric coefficients, and it is the number made out of particles to change the response. At this point, we can break down the change parts to manage stoichiometric issues. 

Steps to be followed are: 

  • First, we genuinely expected to change the given condition. 
  • The given substance ought to have the unit as a mole. 
  • Calculate the number of moles 

Gay Lussac’s Law of Gaseous Volumes 

Gay Lussac originated in the year 1808. This law was fittingly clarified by Avogadro. 

What is Gay-Lussac’s Law? 

Gay-Lussac’s law is a gas law that imparts that the strain applied by a gas (of a given mass and kept at a consistent volume) moves straightforwardly with the far and away from the temperature of the gas. Likewise, the strain applied by gas is identified with the temperature of the gas when the mass is fixed and the volume is dependable. 

This law was portrayed by the French physicist Joseph Gay-Lussac in the year 1808. The numerical verbalization of Gay-Lussac’s law can be made as takes note: 

P ∝ T; P/T = k 


  • P is the strain applied by the gas 
  • T is the by and large temperature of the gas 
  • k is solid. 

Avogadro Law 

It conveys that when the temperature and strain conditions are something practically indistinguishable, gases of equivalent volumes contain a similar number of particles. 

What is Avogadro’s Law? 

Avogadro’s law, regardless, called Avogadro’s standard or Avogadro’s theory, is a gas law that imparts that the complete number of particles/particles of gas (for example the extent of vaporous substance) is straightforwardly contrasted with the volume needed by the gas at unsurprising temperature and strain. 

Avogadro’s law is steadfastly identified with the ideal gas condition since it joins temperature, tension, volume, and extent of substance for a given gas. 

The above-depicted laws affected Dalton’s nuclear theory.

Also Check Study Tips to score good marks in Exam

To Conclude

A deep understanding of this chapter is very important for students to make their roots more stronger in chemistry. And we believe our class 11 chemistry chapter 1 notes will definitely help you to fly more higher in the sky of chemistry. Some Basic Concepts of Chemistry class 11th notes are made by the highly qualified teachers of Vidya Setu. If you want, you can also download our class 11th chemistry chapter 1 notes PDF. It will help you to study offline whenever and wherever you want.

The experienced Science Faculties of Vidya Setu ensure 100% cooperation and support to the aspiring students of science for career development and to study far as the sky’s the limit. For inquiry, you may call, at +91 78218 21250 with the authorized subject teacher of VIDYA SETU for sharing the concepts with amazing solutions. And don’t forget to share your views about our class 11 chemistry chapter 1 notes in the comment section below.