CBSE Class 11 Notes Chapter 1 - Some Basic Concepts of Chemistry

Chemistry is referred to as the “Central Science” as it interconnects geology, biology, environmental science, and physics to each other. Ancient Indians had knowledge of various concepts from chemistry even before it emerged as a discipline. In chemistry, one of the core fundamental concepts is matter – it is defined as a substance that occupies physical space and has inertia. There are three states of matter viz solid, gas, liquid. Matter can also be classified into compounds, mixtures or elements.

Laws Of Chemical Combination

There are five basic laws that govern the chemical combination of elements. They are as follows:

Law of Conservation of Mass

It states that during a chemical reaction, the mass of the products and reactants will always be equal.

Explore more: Law of Conservation of Mass

Law of Definite Proportions

It states that every chemical compound will contain a fixed and constant proportion by mass, of its constituent elements. Joseph Proust proposed this law.

Read more: Law Of Constant Proportions

Law of Multiple Proportions

It is a rule of stoichiometry formulated by John Dalton.

Also Read: Stoichiometric Calculations

Gay Lussac’s Law of Gaseous Volumes

Gay Lussac gave this law in the year 1808. This law was properly explained by Avogadro.

Read more: Gay Lussac’s Law

Avogadro Law

It states that when the temperature and pressure conditions are same, gases of equal volumes contain the same number of molecules.

Read more: Avogadro Law

The above-described laws led to Dalton’s atomic theory.

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Few Important Questions

  1. Define mass and write its SI unit?
  2. Calculate the number of atoms in 52 moles of Ar and 52 g of He.
  3. What is the mass per cent of elements present in Na2SO4
  4. What is the difference between 0.50 mol Na2CO3 and 0.50 M Na2CO3

To discover more about this chapter browse through Some Basic Concepts Of Chemistry Class 11 Notes  from BYJU’S.

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