Ozone layer (Importance, depletion, effects and protection of ozone layer)
Ozone is a pale-blue gas that forms a layer in the stratosphere of our atmosphere called ozone layer. This layer absorbs about 99% harmful solar […]
Chemistry
Acid rain (Formation and effects)
Various industrial gases like carbon dioxide, sulphur dioxide, sulphur trioxide, nitric oxide, nitrogen dioxide in reaction with water of the atmosphere form acids. Those acids […]
Greenhouse effect (Sources, effects, importance and controlling measures)
Different types of gases like carbon dioxide, chlorofluorocarbon, methane, oxides of nitrogen, water vapor etc. is present in the troposphere of the atmosphere. These gases […]
The Carbon cycle
Carbon is a basic component of plants and animals. There is a continuous exchange of carbon dioxide between the atmosphere, aquatic bodies and living organisms. […]
The Nitrogen cycle
Nitrogen is an essential constituent of plant and animal proteins, vitamins and nucleic acids. The atmosphere is the main source of nitrogen gas which is […]
Some important science questions
A. Knowledge Type Questions: What is meant by freefall? What is the value of ‘g’ on: i) the surface of the moon ii) the equator […]
Co-ordinate covalent bond (Formation and properties)
Co-ordinate covalent bond is a special type of covalent bond. When both the electrons of the electron pair, to be shared equally between two atoms, […]
Hydrogenation: Addition of hydrogen
A reaction in which two molecules combine to yield a single molecule or product is called an addition reaction or combination reaction. The addition reaction, […]
Stoichiometry (Quantitative relationship between reactants and products)
Stoichiometry (Greek; ‘Stoicheion’ meaning ‘element’ and ‘metron’ meaning ‘measurement’) means to measure elements. Thus, stoichiometry is the branch of science (Chemistry) that deals with the […]
Chemical reactions, balanced and unbalanced chemical equations
Chemical reaction: Physical Change: temporary & usually reversible change in which no new substance are formed e.g. Melting of ice or wax, magnetizing or demagnetizing […]