Q. Why is a gauze mat placed on a tripod?
A piece of laboratory apparatus consisting of a flat piece of wire gauze placed on a tripod to give a beaker or flask additional support or to distribute heat more evenly.
Q. Why is a wire gauze placed under the glass apparatus when they are heated?
wire gauze is usually used to keep glass beakers or flasks from breaking due to heat shock. This creates stressthat can eventually cause the glass to break. When a Bunsen burner is used, a piece of wire gauze is often placed between the beaker/flask and a ring that is used to hold the beaker .
Q. What are wire gauze used for in chemistry?
A wire gauze is a sheet of thin metal that has net-like patterns or a wire mesh. Wire gauze is placed on the support ring that is attached to the retort stand between the Bunsen burner and the glassware to support the beakers, flasks, or other glassware during heating.
Q. What is the function of gauze mat?
Gauze pads are pieces of fabric used to cover a wound. A gauze pad is a piece of fabric used to guard and cushion a wound, to absorb blood or other fluids, to apply ointments, or to rub cleansing fluids, such as rubbing alcohol or iodine, onto a wound or site of incision.
Q. What is a tripod and gauze used for?
A laboratory tripod is a three-legged platform used to support flasks and beakers. Tripods are usually made of stainless steel or aluminium and lightly built for portability within the lab. Often a wire gauze is placed on top of the tripod to provide a flat base for glassware.
Q. Is a metal gauze an insulator?
Water is trapped in between the tiny openings in the gauze and does not move. Therefore, it is much like the trapped air in attic or wall insulation. Heat cannot be transferred through the insulating barrier.
Q. Does a metal gauze allow heat to pass through?
C. Metal gauze does not allow heat to pass through. Water is a poor conductor of heat.
Q. Is water a bad conductor of heat?
This is because water is a poor conductor of heat. Most of the heat will move in a convection current within the water at the top of the test tube, only a small fraction of it will conduct down to the ice cube.
Q. What region of the flame makes the wire gauze red hot first?
Initially the wire gauze conducts heat away so that the gas above does not attain the ignition temperature. When the wire gauze becomes red hot, the gas above attains ignition point and starts burning.
Q. What color flame is the hottest?
white-blue
Q. Why is a blue flame preferred over a yellow?
A blue flame from a Bunsen burner transfers more energy than a yellow Bunsen flame as complete combustion gives a blue flame. … This is because a yellow flame produces a lot of soot. Carbon monoxide, soot and water vapour are produced as well as carbon dioxide.
Q. Why is there a hole in the center of the flame?
The barrel of the burner has small holes at the base of it that you can open or close with the knob. If you close the holes, the only place the flame can get oxygen is at the top of the tube, giving you a luminous flame.
Q. What are the two types of flames?
I learnt that there are two different types of flame: the non-luminous flame and the luminous flame. The luminous flame will turn into a non-luminous flame when the air-hole is opened. A luminous flame is orange in colour which can be clearly seen. Surprisingly, it is not very hot.
Q. What part of the flame is the hottest Bunsen burner?
tip
Q. Under what conditions will the flame strike back?
Strike back occurs when there is too much oxygen and create a green flame at the jet of the Bunsen Burner and creates a loud noise. This only occur when the air hole is fully open.
Q. Why is burner strike back dangerous?
Dangers of a bunsen burner: Strikebacks – A strikeback occurs when the flame is given too much oxygen such that instead of the fire burning at the top of the chimney, it flashes back and burns at the jet, where the methane just enters at the bottom of the chimney.
Q. How do you stop the flame in strike back?
Tie back your hair and take off scarves in order to prevent them from catching fire by mistake. Close the gas supply immediately when the flame strikes back because of excess air supply. If the gas burner is not used for some time, set it to luminous flame and reduce the gas flow.
Q. What part of the non-luminous flame is the hottest Why?
The hottest part of the non-luminous flame is known as: ✖ A. A non-luminous flame is colourless and is much hotter. A non-luminous flame undergoes complete combustion as it draws much more oxygen and gets much hotter.
Q. Why is a non luminous flame used for heating?
Non-Luminous flames are most preferably used in experiments (laboratory operations) because they are hot, not sooty, and less wavy and hence easy to control. In a Bunsen burner, non-luminous flames are formed when the air-hole is opened.
Q. Which part of the flame is least hot?
innermost
Q. Which part of a flame is the coolest?
Actually, the hottest part of the candle flame is the blue part, at 2552 degrees F (1400 C.) That is where the flame has the most oxygen and you are getting complete combustion. The reddish part is the coolest part, about 1472 F (800C).
Q. Which is the coldest part of a flame?
1) The Innermost zone of a flame is dark or black:It consist of hot,unburnt vapours of the combustible material.It is the least hot part of the flame.It is the coldest part of the flame. 2)The middle zone of a flame is yellow:It is bright and luminous.
Q. Which part of candle flame is hottest?
non-luminous zone
Q. Are coals hotter than fire?
Are Coals Hotter Than Flames? No, given all else being equal, coal has the same potential heat as the wood beginnings, but due to the lack of oxygen and surface area, they produce less heat.
Q. Which part of the candle flame is the hottest and why?
The Non-Luminous zone is the region of the complete combustion. If you look at a candle flame closely. You will see an “aura” formed around the candle. Since this zone is complete combustion and it is the hottest part of the flame.
Q. Which substance catches fire itself without being heated?
So, unless phosphorus is heated to 35 °C, it will not catch fire. However, if temperature of air is 35°C or more, phosphorus will catch fire without heating. Similarly, Kerosene oil and wood do not catch fire on their own at room temperature.
Q. Why do fuel not catch fire in open?
The problem is that air does not actually contain that much oxygen. Air is mostly nitrogen. For example, thermite is just aluminum powder (the fuel) mixed in with iron oxide (the oxygen source). The second reason that everyday metal objects don’t burn so well is that metals generally have a higher ignition temperature.
Q. Why does yellow phosphorus catches fire on its own?
Phosphorus catches fire on its own without any external heat. Because phosphorus slow oxidation by air and during this process, heat is evolved. This heat accumulates in the substance till its ignition temperature is attained. At this point, it burns spontaneously.
Q. Does water catch fire?
Water doesn’t catch fire because it can’t burn anymore. Burning in our atmosphere is a reaction with oxygen, and in water hydrogen and oxygen have already burned. You can’t burn twice. The reason water extinguishes flames is because it is exceptionally good at absorbing heat.
Q. Can fire burn underwater?
Originally Answered: Can fire occur underwater? Yes. If you supply fuel and oxidizer. There are also flares that burn underwater.
