Acids, Bases and Salts

Acid – An acid is a chemical material which exhibits following properties –

Sour in taste; when sprinkled on a blue litmus paper, turns it red; contains replaceable hydrogen; gives out hydrogen ion H+ in Aqueous Solution according to Arrhenius Theorem; can donate a proton According to Bronsted Lowry concept and can accept electrons according to Lewis Concept

Oxidation and Reduction

Oxidation and Reduction - The earliest view of oxidation and reduction is that of adding oxygen to form an oxide (oxidation) or removing oxygen (reduction). They always occur together. For example, in the burning of hydrogen the hydrogen is oxidized and the oxygen is reduced. The combination of nitrogen and oxygen which occurs at high temperatures follows the same pattern.

Chemical Bonding

What is a Chemical Bond?

A chemical bond is an attraction between atoms that allows the formation of chemical substances that contain two or more atoms. The bond is caused by the electrostatic force of attraction between opposite charges, either between electrons and nuclei, or as the result of a dipole attraction.

Periodic Classification of Elements

• In periodic table Elements are classified on the basis of similarities in their properties.
• Döbereiner grouped the elements into triads and Newlands gave the Law of Octaves.
• Mendeléev arranged the elements in increasing order of their atomic masses and according to their chemical properties.

Atomic Structure

Atom - The name atom originated from the Greek Word atomos, meaning "indivisible" or uncuttable, or indivisible, something that cannot be divided further. Atoms are the basic building blocks of matter that make up everyday objects. The atom is a basic unit of matter that consists of a dense central nucleus surrounded by negatively charged electrons. The atomic nucleus contains a mix of positively charged protons and electrically neutral neutrons.

Introduction to Chemistry

Chemistry is the systematic study of composition of matter and also the chemical and physical properties related to different material objects.

Lavoisier (1743-1793), a French Chemist is regarded as the Father of Modern Chemistry.

The Difference between living and non living

The word ‘living’ can not be defined in a single word or phrases. However, we can distinguish between livings from non living on the basis of following characteristics-

Growth- As time passes living shows growth as number of cells increases and results in increase in mass.

Reproduction- Living organisms produce other living organisms similar in physical characters and traits.