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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 were two important discoveries that Joseph prietley had?
Joseph Priestley is best known for his discovery of oxygen in its gaseous form, which he referred to as "dephlogisticated air." Additionally, he discovered several other gases, including nitrous oxide (laughing gas) and ammonia. His work laid the foundation for modern chemistry and significantly advanced the understanding of gases and their properties.
What is a sentence using the word filter?
"Without the air filter, the increased dust in the air would trigger my allergies." "Intelligence agencies must filter the information they collect to find what is useful."
What is the difference between research in the field and in the laboratory?
in the field, scientists have the opportunity to collect data in an original setting in the labrotory, scientists have the opportunity to collect data in a controlled enviroment. unlike the field the labrotory allows scientists to control conditions like temperature, lightning, and even the surrounding air.
What does atmospheric pressure measure?
The force of colliding particles
How did Jan ingenhousz collect a sample of dephlogisticated air?
No one knows
How does Jan Ingenhousz may have collected a sample of dephlogisticated air?
Jan Ingenhousz likely collected a sample of dephlogisticated air, which we now understand as oxygen, by using a method involving the photosynthesis of aquatic plants. He placed water plants in sunlight and observed that they released bubbles, which were primarily composed of oxygen. By capturing these bubbles in an inverted container filled with water, he could collect and analyze the gas, thus isolating what he termed dephlogisticated air. This experimentation contributed significantly to the understanding of gases involved in respiration and photosynthesis.
How didIgenhousz collect sample of dephlogisticated air?
Jan Ingenhousz collected samples of dephlogisticated air by conducting experiments on plants, particularly focusing on their ability to produce gas during photosynthesis. He used a setup that involved placing aquatic plants in sunlight and capturing the gases released in water. This allowed him to isolate and study the oxygen produced, which he referred to as "dephlogisticated air," distinguishing it from the carbon dioxide present in the atmosphere. His work laid foundational concepts for our understanding of photosynthesis and gas exchange in plants.
How do you think ingenhousz showed that it was dephlogisticated and not fixed air?
Ingenhousz demonstrated that oxygen (dephlogisticated air) was produced during photosynthesis by showing that plants release this gas in the presence of light. This was different from fixed air (carbon dioxide) because plants were observed to only release oxygen in the light, suggesting a direct relationship between the presence of light and the production of oxygen.
How did Ingenhouze may have collected a sample of dephlogisticated air?
Ingenhousz likely collected a sample of dephlogisticated air, which we now know as oxygen, by using a method involving plant photosynthesis. He would have placed aquatic plants in water and exposed them to sunlight, observing the bubbles released during photosynthesis. These bubbles, primarily composed of oxygen, could then be collected and analyzed, allowing him to demonstrate the production of this gas in the presence of light. This experiment contributed to the understanding of the role of plants in oxygen production.
How do you pronounce dephlogisticated air?
Dephlogisticated air is pronounced as "dee-flaw-juh-stih-kay-tid air." The emphasis is on the "flaw" syllable in "dephlogisticated." This term is often used historically in the context of chemistry and phlogiston theory.
How did ingenhousze showed this was dephlogisticated and not fixed air?
Joseph Priestley, through experiments with gases, demonstrated that "dephlogisticated air" (what we now know as oxygen) was distinct from "fixed air" (carbon dioxide) by observing their different properties. He showed that dephlogisticated air supported combustion and respiration, while fixed air did not. Additionally, he found that dephlogisticated air produced a brighter flame and was absorbed by substances like rusting iron, which further distinguished it from fixed air. This helped lay the groundwork for understanding the composition of air and the nature of gases.
Why do scientists collect and test air samples?
Scientists collect and test air sample because they want to see how clean/polluted it is. Then they can raise awareness to people if needed.
What was dephologisticated air?
dephlogisticated air is oxygen gas; - so called by Dr. Priestly and others of his time.
What is the modern word for the gas produced by a plant to make dephlogisticated air?
Oxygen.
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.
How do you tell the difference between fixed air and dephlogisticated air?
Fixed air, known as carbon dioxide, is a gas that does not support combustion and can be absorbed by water, forming carbonic acid. In contrast, dephlogisticated air, which is oxygen, supports combustion and is necessary for fire to burn. To differentiate between them, you can perform a simple test: bubbling fixed air through lime water will turn it milky due to calcium carbonate formation, while dephlogisticated air will reignite a glowing splint. These reactions clearly demonstrate their distinct chemical properties.
