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Chemistry
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13 Dec 2019

Is the temperature of a luminous flame greater or less that that of a nonluminous flame? Explain .

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Keith Leannon
Keith LeannonLv2
17 Dec 2019
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Related questions

Consider Potassium atoms in a flame atomizer. The 4s to 40transition has a spectral doublet at 766 nm. (nominal - average ofall 4p states)

  1. What is meant by the term "doublet" in the description, and whydoes this occur in potassium?
  2. Calculate the ratio of atoms in the 4p states (all three) tothose is the 4s state for a flame temperature of 2800K
  3. Potassium can be determined by flame-AES or flame-AAS, but thesignal in Flame-AES is very noisy. Explain why this is so and alsowhy ICP-AES acheives a less noisy signal.

The laminar flame speed of a premixed stoichiometric mixture of propaneair at 1 atm and 298 K is 0.4 m/s. If the nitrogen is replaced with helium, estimate the flame speed using the thermal flame theory. Assume that the temperature does not change. The thermal conductivity of the helium mixture is 0.36 W/m . K at 298 K. Assume it increases as a function of T 1/2. Use cp = 2.5R for helium and cp = 3.5R for nitrogen. In reality the flame temperature will increase because the specific heat of the helium is lower than that of nitrogen. Explain quantitatively how this would change the flame speed estimated above.

How do you determine flame temperature in a Atomic Absorption Spectrometry (AAS) from flame composition? The composition is 0.0026

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