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What is the phylogiston theory of burning - how is it correct?
The phlogiston theory of burning is an outdated concept that suggested a substance called "phlogiston" was released during combustion. It was believed that the presence of phlogiston was necessary for materials to burn. However, this theory has been disproven with the advancement of modern chemistry, which identifies combustion as a process involving the reaction of materials with oxygen in the air.
Why was the pholgiston theory thought to be incorrect?
The theory holds that all flammable materials contain phlogiston, a substance without color, odor, taste, or mass that is liberated in burning. Once burned, the "dephlogisticated" substance was held to be in its "true" form, the calx."Phlogisticated" substances are those that contain phlogiston and are "dephlogisticated" when burned; "in general, substances that burned in air were said to be rich in phlogiston; the fact that combustion soon ceased in an enclosed space was taken as clear-cut evidence that air had the capacity to absorb only a definite amount of phlogiston. When air had become completely phlogisticated it would no longer serve to support combustion of any material, nor would a metal heated in it yield a calx; nor could phlogisticated air support life, for the role of air in respiration was to remove the phlogiston from the body."[4] Thus, phlogiston as first conceived was a sort of anti-oxygen.Joseph Black's student Daniel Rutherford discovered nitrogen in 1772 and the pair used the theory to explain his results. The residue of air left after burning, in fact a mixture of nitrogen and carbon dioxide, was sometimes referred to as "phlogisticated air", having taken up all of the phlogiston. Conversely, when oxygen was first discovered it was thought to be "dephlogisticated air", capable of combining with more phlogiston and thus supporting combustion for longer than ordinary air.[5]j.mastanrao.chemistry mentorandhra pradeshindiae mail: jmrao2006@gmail.com
What was the composition of priestley dephlogisticated air and Rutherford's phlogisticated air?
The facts, as they stand, are these: every creature, when respiring, releases phlogiston. In fact, respiration is simply to be considered a form of combustion. Anything that can burn contains phlogiston. Substances, when burnt, release this weightless, invisible substance - an element of their being, their composition - the phlogiston. The phlogiston is always in need of somewhere to go. Such as, air is best for the phlogiston. Air can absorb it. Taking this mode of thinking to its furthest logical conclusion we can only state that the reason creatures "suffocate" is because there is nowhere for the phlogiston to go. When air was removed from around a living creature then there is nowhere for the phlogiston to go and so respiration would cease and the creature dies.
What was the evidence of phlogiston theory?
One piece of evidence for the phlogiston theory was the observation that combustion released a substance called "phlogiston" from burning materials, leaving behind ash. Another piece of evidence was the weight gain of metals when they were heated in air, which was believed to be due to the absorption of phlogiston. However, the theory was eventually disproven with the discovery of oxygen and the understanding of oxidation.
What is the word for dephlogisticated air?
The term "dephlogisticated air" historically refers to what is now known as oxygen. The concept originated from the phlogiston theory of combustion, which proposed that a substance called phlogiston was released during burning. When experiments showed that certain gases supported combustion and respiration, they were described as being "dephlogisticated," indicating the removal of phlogiston. Today, we understand these gases to be primarily oxygen.
What did scientist think phlogiston was?
Phlogiston can be defined as "a hypothetical substance once believed to be present in all combustible materials and to be released during burning." Chemistry was so underdeveloped at the time Antoine Lavoisier gained interest in it that it could hardly be called a science. The prevailing view of combustion was the Phlogiston Theory which involved a weightless or nearly weightless substance known as phlogiston. Metals and fire were considered to be rich in phlogiston and earth was considered phlogiston poor. The following were the main theories put forward for 'phlogiston': * Weight loss when combustibles are burned because they lose phlogiston * Fire burns out in an enclosed space because it saturates the air with phlogiston * Charcoal leaves very little residue when burned because it is made mostly of phlogiston * Animals die in an airtight space because the air becomes saturated with phlogiston * Some metal calxes turn to metals when heated with charcoal because the phlogiston from the charcoal restores the phlogiston in the metal
Did Antoine lavoisier agree with the phlogiston theory?
The Phlogiston theory was before it waslearned that matter burns by using oxygen. Most chemists looked to explain combustion as the release of an unknown substance, which they named "phlogiston". Phlogiston theory was a conceptual breakthrough that helped chemists conduct experiments and share ideas.
Pollution that releases particles into the air from burning fuel is called?
smoke
What was the phlogistone theory?
It was first thought that phlogiston was a substance, or gas rather, that was secreted from a combustion reaction. It was also thought that when the air became highly concentrated with phlogiston that the reaction would cease. However, this was later disproved by Lavoisier, who discovered that the reason combustion reactions ceased was because of the lack of oxygen. Oxygen, in fact, used to be called dephlogisticated air.
How does cars put carbon dioxide into the air?
Burning gasoline releases the carbon dioxide.
Why did the work of Antoine Lavoisier and Joseph Priestley's work change people's ideas about burning?
　1.burning has been important to people ever since early humans learnt how to control fire. But HOW do things burn? This was a question which it took centuries to answer - and until it could be answered, chemistry could never make much progress. By the 17th century scientists were beginning to realise that the burning of fuels, the reactions of metals in air and the breathing of animals all had something in common - they were all faster or slower versions of the same type of reaction. Wood turnss to ashes when it burns.　2. It made correct predictions of heat transfer, neglecting radiative heat transfer, and did not provide specifics of why certain materials had an "affinity" for phlogiston over other materials.　3.It is believed that matter is made from the elements air, water, and 3 elements of earth terra pinguis (fatty earth), mercurial, and fusible. On combustion it was thought that the fatty, combustible earth burnt away during combustion. In 1703 George Stahl renamed the terra pinguis as phlogiston, to take into account the corrosion of metals to be the "matter and principle of fire, not the fire itself". Contained in all combustible matters escaping from all burning material. For example a piece of wood turning to ashes on burning, the burning is explained by the escape of the phlogiston from the wood originally composed of ashes and phlogiston.4.
What are the good points of the phlogiston theory?
a combustible material is made up of 2 parts: the calx and phlogiston when a substance burnt the phlogiston into air and calx(ash) left behind so there are no good points of this theory
