Grade 8 69
Uses of Oxygen Video
Uses of Oxygen: Oxygen is of great importance in the chemical and the iron and steel industries. Its major use is in steel production, for example in the Bessemer process. The oxyacetylene torch is another important industrial application. Oxygen is utilized in medicine in the treatment of respiratory diseases and is mixed with other gases for respiration in […]
Chemical Properties of Oxygen Video
Chemical Properties of Oxygen : Oxygen is a highly reactive element, highly paramagnetic, and is easily capable of combining with other elements. One of oxygen’s most important chemical properties is that it supports combustion Oxygen also combines with elements at room temperature, for example, the formation of rust. Decaying is an example of oxygen reacting […]
Chemical Properties of Metals and Non Metals Video
Chemical Properties of Metals and Non Metals Metallic oxides are basic in nature.They frequently dissolve in dilute mineral acid to liberate hydrogen gas.They either do not combine with hydrogen and form non volatile hydrides.Their chlorides are not hydrolyzed by water. Chemical Properties of Metals and Non Metals are considered during their reaction with other compounds. Non […]
Uses of Metals and Non Metals Video
Uses of Common Metals and Non Metals: All the elements can be classified as metals or non-metals depending on their properties. Metals occupy the bulk of the periodic table, while non-metallic elements can only be found on the right-hand-side of the Periodic Table. Non-metals are found in free state as well as in the form of compounds. On […]
Uses of Metals Video
Uses of Metals: All the elements can be classified as metals or non-metals depending on their properties. Metals are electropositive in nature (Watch Uses of Metals Video to learn more). They generally have 1, 2 or 3 electrons in their valence shells and readily lose these electrons to form positively charged ions (cations). Metals: Metals are strong, […]
Reactivity of Metal Video
Reactivity of Metal: The relative capacity of an atom, molecule, or radical to undergo a chemical reaction with another atom, molecule, or compound (Watch Reactivity of Metal Video to learn more). Metals are solids at room temperature e.g. sodium, aluminium , potassium, magnesium. There are exception to this. Mercury and gallium are metals but they are […]
Prevention of Corrosion Video
Prevention of Corrosion: Corrosion is the deterioration of materials by chemical interaction with their environment. The term corrosion is sometimes also applied to the degradation of plastics, concrete and wood, but generally refers to metals. The most widely used metal is iron (usually as steel) and the following discussion is mainly related to its corrosion (Watch […]
Physical Properties of Metals Video
Physical Properties of Metals: The metals have a shiny appearance, they show a metallic luster. Due to their shiny appearance they can be used in jewellery and decorations. Particularly gold and silver are widely used for jewellery. In the old days, mirrors were made of shiny metals like silver. Silver is a very good reflector. […]
Occurrence of Metals Video
Introduction About Occurrence of Metals: Metals occur in nature in free as well as combined form. Metals having low reactivity show little affinity for air, moisture, carbon dioxide or other non-metals present in nature. Such metals may remain in elemental or native (free) state in nature. Such metals are called “noble metals” as they show […]
Metallurgical Process Video
Metallurgical Process: Metallurgy refers to the science and technology of metals. Metallurgical reactions take place either at high temperatures or in aqueous solutions. Reactions take place more rapidly at a higher temperature, and thus large-scale metal production is mostly done through high-temperature processes. Most metallurgical reactions occurring at high temperatures involve an interaction between a gas […]
Corrosion Videos
Introduction About Corrosion Videos: Corrosion can be defined as the degradation of a material due to a reaction with its environment. Degradation implies deterioration of physical properties of the material (Watch Corrosion Videos to learn more). Corrosion The consequences of corrosion are many and varied and the effects of these on the safe, reliable and efficient […]
Comparison of Metal and Non Metal Video
Comparison of Metal and Non Metal: All the elements can be classified as metals or non-metals depending on their properties. Out of the 92 naturally occurring elements, about 70 are identified as metal and about 22 as non-metals. Copper, iron, zinc, aluminium, gold, silver, tungsten displays the properties of metals. Like they produce ringing sound […]
Characteristics of Metals and Non Metals Video
Characteristics of Metals and Non Metals: A metal is a chemical element whose atoms readily lose electrons to form positive ions (cations), and form metallic bonds between other metal atoms and ionic bonds between nonmetal atoms. Non-Metal is a chemical element lacking typical metallic properties.Watch Characteristics of Metals and Non Metals to learn more. Metals […]
Alloys Video
Introduction About Alloys Video: Alloys are metallic materials consisting of two or more elements combined in such a way that they cannot be readily separated by physical means. More than 90% of metals used are in the form of alloys.watch Alloys Video to learn more Alloys: The word alloy described as a “mixture of metals”, but […]
Alloys of Iron Video
Introduction About Alloys of Iron Video: Iron castings are produced by a variety of molding methods and are available with a wide range of properties. Cast iron is a generic term that designates a family of metals.watch Alloys of Iron Video to learn more. Alloys of Iron: To achieve the best casting for a particular […]
Alloys of Copper Video
Introduction About Alloys of Copper Video: A mixture containing two or more metallic elements or metallic and nonmetallic elements usually fused together or dissolving into each other when molten.watch Introduction About Alloys of Copper Video to learn more. COPPER AND ITS ALLOYS Melting point of copper – 10830 C Main properties of copper: High electrical and […]
Alloys of Aluminium Video
Introduction About Alloys of Aluminium Video: Aluminum alloys have numerous technical advantages that made them one of the dominant structural material families of the 20th century. Aluminum has low density (2.71 g/cm3) compared with competitive metallic alloy systems.watch Introduction About Alloys of Aluminium Video to learn more. Aluminium: Pure aluminium is relatively soft. To overcome this, the metal can be alloyed […]
Air is a Mixture Video
Air is a Mixture: The air around us is a mixture of gases, mainly nitrogen and oxygen, but containing much smaller amounts of water vapor, argon, and carbon dioxide, and very small amounts of other gases. Air also contains suspended dust, spores, and bacteria. Because of the action of wind, the percent composition of air […]
Air Pollution Video
Air Pollution: Air pollution may be defined as any atmospheric condition in which substances are present at concentrations high enough above their normal ambient levels to produce a measurable effect on man, animals, vegetation, or materials.Air pollution can harm us when it accumulates in the air in high enough concentrations. People exposed to high enough […]
Atmosphere Video
Introduction About Atmosphere Video: Earth’s atmosphere is a critical system for life on our planet. Together with the oceans, the atmosphere shapes Earth’s climate and weather patterns and makes some regions more habitable than others. But Earth’s climate is not static.watch Introduction About Atmosphere Video to learn more. The Atmosphere The atmosphere is composed of nitrogen, […]
Atmospheric Pressure Video
Introduction About Atmospheric Pressure: The atmospheric pressure is the force exerted by the weight of the Earth’s atmosphere, expressed per unit area in a given horizontal cross-section. Thus, the atmospheric pressure is equal to the weight of a vertical column of air above the Earth’s surface, extending to the outer limits of the atmosphere. Atmospheric […]
Causes of Air Pollution Video
Causes of Air Pollution: Pollution is an undesirable change in the physical, chemical or biological characteristics of air, water and soil that may harmfully affect the life or create a potential health hazard of any living organism. Pollution is thus direct or indirect changes in any component of the biosphere that is harmful to the […]
Composition of Air Video
Composition of Air: The atmosphere is the mixture of different types of gases, including water vapour and dust particles. Nitrogen and Oxygen are the two main gases of the atmosphere. 99 percent part of it is made up of these two gases. Other gases like organ, carbon dioxide, hydrogen, nion, helium etc.watch Composition of Air […]
Prevention of Air Pollution Video
Prevention of Air Pollution: Pollutants, which contaminate the atmosphere and present a danger to public health, include nitrogen dioxide, SPM, photochemical oxidant, sulfur dioxide, carbon monoxide, and Fine Particulate Matter. For these substances, environmental quality standards (reference ⇒ P.80) have been established as administrative targets. In order to improve air pollution and to protect the […]
