Primary pollutants are directly emitted from the sources. Examples of primary pollutants are carbon monoxide, carbon dioxide, sulphur dioxide and benzene etc. Secondary pollutants are not emitted directly. They are formed from the combination of primary pollutants with some other compound. Examples of secondary pollutants are Ozone, Formaldehyde, PAN (peroxyContinue Reading
Shiva Thapa (56kg) was the lone Indian boxer to make the final after Olympic-bound Vikas Krishan (69kg) settled for a bronze medal following his loss in the semifinal of the 43rd men’s and women’s Grand Prix in Usti nad Labem, Czech Republic. Shiva, who has been picked in the teamContinue Reading
1.Global warming is due to increased production of Answer : Carbon dioxide 2. Which acid is present in lemon Answer : Citric acid 3.Brass is an alloy of copper and Answer : Zinc 4. The hardest natural substance known in the world is AnswerAnswer Answer : Diamond 5.Permanent hardness ofContinue Reading
Endosulfan is an organochlorine compound that is used as an insecticide and acaricide. This colourless solid has emerged as a highly controversial agrichemical due to its acute toxicity, potential for bioaccumulation, and role as an endocrine disruptor. Banned in more than 63 countries, including the European Union, Australia and NewContinue Reading
Sodium Silicate (Na2o, Sio2) Sodium Silicate is a compound mixture of sodium oxide i.e. Na2o with silica sand i.e. Sio2 with water. Sodium silicate is also called water glass. There are two process to manufacture liquid Sodium Silicate. To manufacture a lower ratio of Sodium Silicate by Hydrothermal process. MixtureContinue Reading
Three scientists won the Nobel Prize in chemistry today for developing a process that, among other things, helps synthesize medicines. Richard Heck, Ei-ichi Negishi and Akira Suzuki were cited for their work in “palladium-catalyzed cross couplings in organic synthesis.” That’s a way of joining together carbon atoms — using theContinue Reading
Covalent bonds are chemical bonds between two non-metals, for example between H and O in water (H2O). As they are both non-metals—which need to gain electrons—they have to share, so their outer shells cross over in order to have a full outer shell. A full outer shell has eight electrons.Continue Reading
Chemical bonds are what join together atoms. When two or more atoms are in a chemical bond they stay joined unless the needed amount of energy or more is transferred to the bond. Something different can then happen. Chemical bonds can be explained using different theories. Some of these theoriesContinue Reading
A plastic is a material that can change its shape, so many things can be made of plastic. There are many types of plastic. Some can be shaped only when they are freshly made; then they become hard afterwards. Others can be changed by heating them up or even byContinue Reading
Boyle’s Law It states that when any gas is expanded or compressed at constant temperature, its volume (V) and pressure (P) are inversely proportional to each other. P ∞ 1/V (or) PV = constant Charle’s Law It states that when any gas is expanded or compressed at constant pressure, itsContinue Reading
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