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Bunsen Burners
The Bunsen burner was named after Robert Bunsen. It is commonly used in science laboratories. This category contains questions relating to the Bunsen burner, its use and its history.
1,143 Questions
Is more oxygen used in an incomplete combustion than a complete combustion?
Yes, more oxygen is used in incomplete combustion compared to complete combustion because incomplete combustion results in the partial burning of the fuel, leading to the formation of more byproducts like carbon monoxide and soot. This requires additional oxygen to combine with these byproducts, using up more oxygen overall.
How is light emitted from elements useful to scientists?
The unique light emission patterns of elements, known as their atomic spectra, can provide valuable information to scientists. By studying these spectra, scientists can identify elements present in a sample, determine their concentrations, and even understand the chemical and physical properties of the material under study. This information is used in various fields such as astronomy, environmental science, and materials science.
Was it Michael Faraday or Peter Desdega who designed the Bunsen burner?
The Bunsen burner was invented by Robert Bunsen and Gustav Kirchhoff in the 1850s. Neither Michael Faraday nor Peter Desdega were involved in the creation of the Bunsen burner.
Why does a paper snake spin when held over a Bunsen burner?
The spinning motion of the paper snake when held over a Bunsen burner is due to convection currents created by the heat rising from the flame. As the air above the flame gets hot, it rises creating a low-pressure area that causes the paper snake to rotate. This is a demonstration of the principle of convection.
What happens to chemicals after you use a Bunsen burner?
Chemicals are typically heated and undergo chemical reactions or changes when using a Bunsen burner. Some chemicals may evaporate, decompose, or react with other substances, leading to the formation of new compounds or products. It is important to handle and dispose of any remnants of chemicals properly according to safety guidelines.
What would you use to melt crystal over a Bunsen burner?
Using a platinum or nickel crucible would be recommended for melting crystal over a Bunsen burner, as these materials have high melting points and are resistant to corrosion. It is important to ensure that the chosen crucible is compatible with the crystal being melted to prevent contamination.
The densities of the lanthanides generally have less variability compared to the densities of the actinides. This is because the lanthanides are more similar in size and electronic structure, leading to more consistent densities. In contrast, the actinides exhibit larger variations in density due to differences in atomic structure and electron configurations.
What is the temperature for the flame on the Bunsen burner?
This is a two part question:
1. How hot is a Bunsen burner flame?
2. How to convert degrees Fahrenheit to Kelvin?
The air around the Bunsen burner will determine how hot it burns
The gas used in the Bunsen burner with determine how hot it burns
The purity of the gas used in the Bunsen burner will determine how hot it burns
The location that the gas was manufactured will determine how hot it burns
etc etc etc
Lets use LPG gas like the stuff you use in Barbeque Grills. Its about 90% propane, and the rest mostly butane and propylene and other stuff too. Again this varies widely depending on where it was made.
It burns at around 1925 degrees so lets use 2000 degrees for a nice round number. Your teacher cant argue with this because of the reasons I listed above.
Formula:
[K] = ([°F] + 459.67) × 5⁄9
So:
K = (2000 + 459.67) x 5 / 9
K = 2459.67 x 5 / 9
k = 1366
Since we rounded up with the 2000 lets round down with the Kelvin
Gas burns at around 1300 Kelvin
1925 F = 1051.67 C = 1324.82 K
Why does a Bunsen burner have different temperatures on the flame?
The basic fuel to a Bunsen burner is a hydro carbon which on heating breaks the carbon bond with other elements with differentiated calorific value and combustion with oxygen. This results in different zones with differentiated temperature
When using a Bunsen burner why do you use the blue flame for heating?
The blue flame in a Bunsen burner is used for heating because it indicates complete combustion of the fuel, resulting in a high-temperature, clean, and efficient flame. This flame is ideal for heating as it produces a steady and controlled heat source for various laboratory applications.
Is calcium carbonate cheap or expensive?
Calcium carbonate is relatively inexpensive as a raw material compared to some other minerals and compounds. Its cost can vary depending on factors such as purity, grade, quantity, and supplier. In general, it is considered a cost-effective option for various applications.
What do you call a flame on a Bunsen burner when the air hole is half open?
A Bunsen burner flame with the air hole half open is typically called a "luminous flame." It appears yellow and produces soot due to incomplete combustion, indicating a fuel-rich environment. Adjusting the air hole allows for better control of the flame temperature and combustion efficiency.
How much oxygen goes into a Bunsen burner when the flame is blue?
In a Bunsen burner with a blue flame, the ratio of oxygen to gas is approximately 1:3. This means that for every molecule of oxygen, about three molecules of gas are present in the mixture. This ratio allows for complete combustion of the gas, resulting in a clean, blue flame.
How hot is a safety flame on a Bunsen burner?
A safety flame on a Bunsen burner is typically around 700°C (1292°F). It is characterized by a blue, well-defined inner cone with a faint outer flame.
Can you melt iron using a Bunsen burner?
No, a Bunsen burner does not produce enough heat to melt iron. Iron has a high melting point of around 1538°C, which requires a much hotter heat source, such as a furnace or a specialized industrial equipment.
When does the flame of a Bunsen burner becomes small or big?
The flame of a Bunsen burner becomes small when the air inlet is closed, leading to a fuel-rich environment. It becomes bigger when the air inlet is opened, allowing more oxygen to mix with the fuel gas and create a hotter, larger flame.
What are the two regions in a Bunsen burner?
What are the two regions in a Bunsen burner?
The two regions in a Bunsen burner flame are:
1.An outer transparent, dim blue cone.
2.An inner,less transparent, brighter greenish-blue cone.
This relatively non luminous,cone shaped flame is a combustion of carbon-hydrogen fuel which is used in a Bunsen burner to provide heat for laboratory purposes.
Which british scientists discovered the first anti biotic?
Sir Alexander Fleming, a Scottish bacteriologist, is credited with the discovery of the first antibiotic, penicillin, in 1928. He observed that a mold (Penicillium notatum) inhibited the growth of bacteria in a petri dish, leading to the identification of penicillin as an effective treatment for bacterial infections.
Two main reasons - one is that the bunsen burner flame is actually quite small in relation to the dimensions of the bottom of the beaker. If you take something that has a small surface area in relation to the size of the flame (for example a glass rod) that can be made to soften in a bunsen burner flame much more easily.
The second reason is that the beaker or flask will generally contain something that you are trying to heat up or boil. So heat energy from the flame will initially transfer through the glass into that substance and be "used up" in bringing this liquid up to its boiling point,
What chemical is the rice puller?
"Rice puller" is not a specific chemical but rather a colloquial term used in scams in India involving the fraudulent sale of supposedly "magical" or "anti-gravity" items that is said to attract rice grains. These scams often involve the use of common items like copper wire or magnets.
Should you always put a gauze mat under a Bunsen burner?
Asbestos does not burn and insulates. If the Bunsen burner should tip over or the material being heated by the burner should drop, the asbestos will protect the tabel underneath.
Certain forms of asbestos have been found to be ealth hazards so now most often other minerals are used in the insulating mats in laboratories.
Why does the flame color change with chemicals?
The different colors of a fire represent different temperatures. Every material has a slightly different color spectrum corresponding to their respective flames when they're burned, but the most common spectrum is the one due to the consumption of oxygen in air, which is the familiar blueish flame at the bottom, orangeish flame in the middle, and yellowish-whiteish flame at the top. Therefore, that's the example I'll use in the rest of this answer.
The first thing to remember for the rest of this answer to make sense is that an electron in an atom is only allowed to have discrete, or quantized, amounts of energy. The second thing to remember is that an atom's electrons are always trying to reach the lowest possible value of these discrete energy states that they can, because that stabilizes them. The last thing to remember is that energy is conserved, always.
That being said, in a fire, the part of the flame that's closest to the source of what's being burned is naturally going to be the hottest part of the flame, since at that point, no thermal energy has yet been released. However, as we continue examining the flames of a fire at further and further distances away from the source, we notice that they get cooler and cooler. This is because more and more energy is continuously being emitted from the flames but no energy is getting absorbed by them, resulting in a net loss of energy. And, since temperature is nothing more than the average kinetic energy of all of the atoms within a system, a loss of energy is the same thing as a temperature drop.
So, what does all of this have to do with color? As stated above, the answer lies in the quantization of energy, the electron's desire to be in lower-energy states of higher stability, and the conservation of energy.
OK, follow along. Energy is conserved. When something gets burned, a chemical reaction takes place that releases energy. That energy can't just magically disappear, because energy is conserved. Where does it go? In this case, most of it is radiated away as infrared radiation, but some of it is absorbed by atomic electrons.
OK, so the electrons now have some of the energy, what next? Well, since energy is conserved, the electrons suddenly find themselves placed in one of those quantized energy levels I was talking about earlier, except these levels have way to much energy for the electrons to feel stable. Therefore, as stated before, twice in fact, the electrons will keep trying to drop down to lower and more stable energy states, and they will eventually succeed.
But, what about the friggin' colors?! I'm not sure if I mentioned this yet of not, but energy is always conserved. So, if an electron drops down to a lower energy state, which means that it loses some energy, that energy has to go somewhere, but where?!?!
And now for the moment you've all been waiting for...the energy that's lost from the electron ends up as an electromagnetic wave having a specific energy that's exactly equal to the energy lost by the electron. And, you guessed it, many of those specific values of electromagnetic energy fall within the visible light spectrum, hence COLOR!
But, why blue at the bottom, then orange, then yellow, then white? I knew I was going to ask that. Remember those discrete, quantized energy levels that the electron could be in? I hope so, because we were just talking about them. Well, it turns out that the values for the energies of those levels get closer and closer and closer together numerically as the electron gains more and more and more energy. For example, let's say that, hypothetically, the first energy level has a value of 10. Then the higher energy values would increase in a way kind of like this:18, then 24, 28, 30, 31, and so on. As you can see, the values themselves are increasing, but the difference between the values is decreasing, and that's what we're concerned with, because, you guessed it, energy is always conserved. Therefore, the electromagnetic wave that is emitted when the electrons lose energy is equal to the difference in energy between the initial and final state the electron was in.
So, you may have made the color connection by now, but in case not, here's two more useful little pieces of information:
1) Only one electron can be in one place at one time, or in this case energy state, or quantum state.
2) The greater the drop in energy of the electron, the greater the energy of the emitted electromagnetic wave, meaning the higher the frequency of that wave.
Keeping this information in mind, when these atomic electrons try to start plummeting down energy levels, because remember, they all want to do that, a problem occurs: there's a whole bunch of other electrons in their way, taking up their energy spot! So, since only one electron can occupy any particular spot at any given time, all the electrons with the higher energy values have to patiently wait for all of the electrons with the lower energy values to get out of their way first (some of them cheat and just cut in front of them though). This means that most of the electrons that initially lose their energy are those having the lowerenergy values, but the greater energy differences. Now's the time to remember that greater energy differences correspond to higher frequency wave emissions, which in turn correspond to, finally, the color blue, which is indeed the color of the flame closest to the source.
Once those electrons have moved out of the way, the ones energetically "above" them can fall into their vacated spots, emitting waves of slightly lower frequencies in the process, because, remember, the differences between energy levels gets smaller as the values for the energies get higher. Hence, waves corresponding to colors having less energy than blue, like green, yellow orange...WHOA, I don't remember there being any green mentioned in the fire!
You're right, it wasn't mentioned, because waves, unlike most particles, can be in the same place at the same time, a phenomena called superposition. Now, who remembers from elementary school what color light is that is a superposition of all the visible wavelengths? That's right, it's white! So what's happening in fire isn't that the colors are going from blue to red, but rather that they're going from blue to whiteas more and more waves are emitted with slightly lower and lower frequencies, all being superposed on top of each other.
Which bunsen burner luminous or non luminous flame used in laboratory and why?
A non-luminous flame is typically used in laboratory settings when using a Bunsen burner. This flame produces a more controlled and homogeneous heat source, making it ideal for processes like heating, sterilizing, and combustion analysis. The non-luminous flame also produces less soot and is more energy efficient compared to a luminous flame.
Why is the blue flame noisier than the yellow flame on a Bunsen burner?
because it's burning more violently
a2. In detail, the flame front is a continuous explosion, travelling faster than the local speed of sound. The gas-air mix reaches explosive mixture levels, explodes, but in doing so it now is removed from the region of explosive mixture, and returns to that point by normal burning. Only to reach the explosive mixture point again. many times per second.
