lab furniture company in vadodara

HillCare Scientific Lab have quality of lab furniture company in vadodara, Oxygen is by far the most abundant of all the elements. It occurs both in the free and in the combined state. In the free state it occurs in the air, volumes of dry air containing about volumes of oxygen. In the combined state it forms eight ninths of water and nearly one half of the rocks composing the earth’s crust. It is also an important constituent of the compounds which compose plant and animal tissues; for example, about by weight of the human body is oxygen. lab furniture manufacturers in vadodara,

Although oxygen occurs in the free state in the atmosphere, itsseparation from the nitrogen and other gases with which it is mixed is such adifficult matter that in the laboratory it has been found more convenient to prepare it from its compounds. The most important of the laboratory methods are the following, Water is a compound, consisting of hydrogen and oxygen. It is easily separated into these constituents by passing an electric current through it under suitable conditions. The process will be described in the chapter on water. While this method of preparation is a simple one, it is not economical.

The manner of preparing oxygen frompotassium chlorate is illustrated in the accompanying diagram. A mixture consisting of one part of manganese dioxide and four parts of potassium chlorate is placed in the flask A and gently heated. The oxygen is evolved and escapes through the tube. It is collected by bringing over the end of the tube the mouth of a bottle completely filled with water and inverted in a vessel of water, as shown in the figure. The gas rises in the bottle and displaces the water. In the preparation of large quantities we are expert in .lab furniture manufacturers in vadodara

In the preparation of oxygen from potassium chlorate and manganese dioxide, the materials used must be pure, otherwise a violent explosion may occur. The purity of the materials is tested by heating a small amount of the mixture in a test tube. At ordinary temperatures oxygen is not very active chemically. Most substances are either not at all affected by it, or the action is so slow as to escape notice. At higher temperatures, however, it is very active, and unites directly with most of the elements. we are expert in .lab furniture manufacturers in vadodara

when they will burn with great brilliancy. Thus a glowing splint introduced into a jar of oxygen bursts into flame. Sulphur burns in the air with a very weak flame and feeble light; in oxygen, however, the flame is increased in size and brightness. Substances which readily burn in air, such as phosphorus, burn in oxygen with dazzling brilliancy. Even substances which burn in air with great difficulty, such as iron, readily burn in oxygen. we are expert in .lab furniture manufacturers in vadodara

The burning of a substance in oxygen is due to the rapid combination of the substance or of the elements composing it with the oxygen. Thus, when sulphur burns both the oxygen and sulphur disappear as such and there is formed a compound of the two, which is an invisible gas, having the characteristic odor of burning sulphur. Similarly, phosphorus on burning forms a white solid compound of phosphorus and oxygen, we are expert in .lab furniture manufacturers in vadodara.

The term oxidation is applied to the chemical change which takes place when a substance, or one of its constituent parts, combines with oxygen. This process may take place rapidly, as in the burning of phosphorus, or slowly, as in the oxidation (or rusting) of iron when exposed to the air. It is always accompanied by the liberation of heat. The amount of heat liberated by the oxidation of a definite weight of any given substance is always the same, being entirely independent of the rapidity of the process. we are expert in laboratory furniture manufacturers in vadodara

lab furniture company in vadodara is sufficient to cause the substance to glow or burst into a flame the process is called combustion. In order that any substance may undergo combustion, it is necessary that it should be heated to a certain temperature, known as the kindling temperature. This temperature varies widely for different bodies, but is always definite for the same body. we are expert in laboratory furniture manufacturers in vadodara

Thus the kindling temperature of phosphorus is far lower than that of iron, but is definite for each. When any portion of a substance is heated until it begins to burn the combustion will continue without the further application lab furniture company in vadodara the process is sufficient to bring other parts of the substance to the kindling temperature. On the other hand, if the heat generated is not sufficient to maintain the kindling temperature, combustion ceases. we are expert in laboratory furniture manufacturers in vadodara

The compounds formed by the oxidation of any element are called oxides. Thus in the combustion of sulphur, phosphorus, and iron, the compounds formed are called respectively oxide of sulphur, oxide of phosphorus, and oxide of iron. In general, then, an oxide is a compound of oxygen with another element. A great many substances of this class are known; in fact, the oxides of all the common elements have been prepared, with the exception of those of fluorine and bromine. Some of these are familiar compounds. Water, for example, is an oxide of hydrogen, we are expert in laboratory furniture manufacturers in vadodara

The particular oxides formed by the combustion of any substance are called products of combustion of that substance. Thus oxide of sulphur is the product of the combustion of sulphur; oxide of iron is the product of the combustion of iron. It is evident that the products of the combustion of any substance must weigh more than the original substance, lab furniture company in vadodara of oxygen taken up in the act of combustion. For example, we are expert in laboratory furniture manufacturers in vadodara

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