1st year high school general science

> Noble gases, some metals, carbon, silicon etc. have only one atom in their molecules. These are called monatomic molecules. Some elements have two atoms in their molecules. These are called diatomic molecules e.g., hydrogen (H 2 ), oxygen (O 2 ), nitrogen (N 2 ), chlorine (Cl 2 ), etc. Those elem..

In sympatric speciation, species diverge while inhabiting the same place. The population is continuous, but nonetheless, the population does not mate randomly. Individuals are more likely to mate with their geographic neighbors than with individuals in a different part of the population's range. E..

High fever, headache, body ache, nausea and violent shivering (rigours) are some of the symptoms of malaria. Each malarial attack lasts for 6-10 hours and consists of the cold stage (shivering), hot stage (fever) and sweating stage (temperature goes down to normal). The fever is repeated..

Usually the term 'alcohol' refers to ethanol. Man has been using ethanol for thousands of years especially in the form of wine. The structural formula of ethanol is given as follows: Its molecular formula is CH 3 CH 2 OH or C 2 H 5 OH Ethanol is colourless liquid and has a pleasant ..

Wave Energy or Sea-wave Energy - Energy from the oceans is also available in the form of oceanic waves or sea-waves. Due to the blowing of wind on the surface of ocean, very fast sea-waves (or water waves) move on its surface. Due to their high speed, sea-waves have a lot of kinetic energ..

. They are generally brittle. Electronic configuration They usually have 1, 2 or 3 electrons in their valence shell. The greater the number of shells and lesser the number of valence electrons, the greater is the reactivity of the metal. They usually have 4, 5, 6 or 7 electrons ..

Human evolution concerns itself with the emergence of humans as a distinct species. Undoubtedly, there are special features possessed by 'Homo sapiens' considered to be at the top of the evolutionary ladder but science has become fully committed to finding purely biological explanations..

Coal and Petroleum - Fossil fuels, like, coal, lignite, petroleum and natural gas are non renewable natural resources. Both have an organic origin and are called hydrocarbon fuels. Coal was formed in nature as a solid from the remains of the trees buried deep inside the earth, some 500 million ..

Even though wind energy is available in plenty, wind is not available at all times. It is unpredictable and not dependable. Hence to produce maximum amount of energy from wind, wind energy maps are prepared, which give us an idea of the average wind speed throughout the year at differen..

. By supplying enough energy, it is possible to remove an electron from an atom. The element is first brought into the vapour state. Then the electron is removed by supplying energy equivalent to the ionization potential. In referring to the Periodic table of ionization potentials (in electron volt..