chemistry is a branch of science which deals with the study of chemicals and substances which show chemical reactions
Structure of atom Basic Details:(a) The word atom was first introduced by Ostwald (1803-1807) in the scientific world.(b) According to him matter is ultimately made up of extremely small indivisible particles called atoms.(c) It takes part in chemical reactions.(d) Atom is neither created nor destroyed. Basic Definitions: Electron: It is a fundamental particle of an atom with […]
Chemistry Series chapter 2: Structure of Atom Read Post »
Thomson’s atomic model proposed that an atom is uniform sphere of positive charges (due to presence of protons ) as well as the negative charges (due to the presence of the electrons.
Thomson, Rutherford and Bohr model of atom. Read Post »
A matter is consists of many atoms and an atom is consists of electrons, protons and neutrons. of these electrons and protons are the equally oppositely charged particles.
Charged Particles in Matter | Electrons and Protons Read Post »
The summation of the atomic masses of all the atoms in a molecule of the substance is known as the molecular mass of that substance. It is expressed in atomic mass units (AMU) or (u).
Molecular Mass and Mole Concept Read Post »
The symbolic representation of composition is termed as the chemical formula of a compound. Two things are required to learn and write a chemical formulas: 1. Ability to write symbols, which one can attain after good practice over learning and memorizing symbols. 2. Combining the capacity of the element of compound or valency.
Chemical Formula of compounds and rules for writing Read Post »
Atoms are extremely small, they are smaller than anything that we can imagine or compare with.For example – more than millions of atoms when stacked would make a layer as thick as any sheet of paper . Atomic radius is measured in nanometres The symbol of an element is formed by writing only the first letter or first letter followed by second and some other letter of the name of that element.
Atom, Atomic Mass, Atoms Existence And Nomenclature Of Elements Read Post »
Lavoisier and Joseph L. Proust proposed two laws of chemical combination. during a chemical reaction, the sum of masses of the reactant and the product remains unchanged or we can say that mass can neither be created nor destroyed. This is known as the law of conservation of mass.
Laws Of Chemical Combination And Dalton’s Atomic Theory Read Post »
chemical composition of matter is the classification of matter on the basis of it’s chemical properties. It is further divided into 3 types , i.e., elements, compounds and mixtures.
Chemical composition of matter Read Post »
Although there are so many factors behind the existence of physical
composition of matter but here basically we will be dealing with the
forces applied between molecules or particles. On this basis, it is
divided into 3 types, i.e., solid, liquid and gases.
Physical composition of matter Read Post »
