I assume the air holes are on a bunsen burner? In which case, when the air hole is closed the flame glows yellow, is less hot, and is more like the flame on a wax candle. When the air hole is opened, air is drawn in and the flame burns blue and produces a fiercer heat.
it is a dish that evaporates with chemicals
The evaporating dish would not be harmed if it was heated on a hot plate, but it should be heated on a bunsen burner.
Evaporating dish is usually made out of glass.It is shaped like a saucer.It is used mostly when dealing with inorganic aromatic compounds.
Evaporating dishes are used to boil solutions. Crucibles are used to heat solids very strongly.
the copper must have combined with another substance.
it doesnt change its color
luminous flame gives partial combustion so you can see some black unburnt vapours deposited on the plate
So that the substance in the evaporation dish is fully protected with the glass! The evaporating dish is used to heat and evaporate liquids. This porcelain item resembles a shallow bowl with a spout. Evaporating dishes are traditionally used to evaporate solvent to concentrate a solution; however they can also be used to hold sand for a sand bath, as a small water bath, or as a drying dish (like a watch glass). If heated by a direct flame, it will often be placed on a clay triangle for support. Thank you for your time! peace.....
Petridish
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it is a dish that evaporates with chemicals
The evaporating dish would not be harmed if it was heated on a hot plate, but it should be heated on a bunsen burner.
Evaporating dish is usually made out of glass.It is shaped like a saucer.It is used mostly when dealing with inorganic aromatic compounds.
An evaporating dish is a shallow, wide dish that is meant to create a large surface area exposed to air. It is used to allow liquids to evaporate into the air quickly.
An evaporating dish comes in a number of sizes, and are usually made of ceramic or glass. All evaporating dishes are bowl-shaped, though some are a lot shallower than others. the evaporating dish is used for just what you would imagine: evaporating liquids over a heat source. I have also seen the larger (white ceramic) dishes used in titrations, where the endpoint is observed against the white of the dish.
Evaporating dishes are used to boil solutions. Crucibles are used to heat solids very strongly.
the copper must have combined with another substance.