4. Name two nineteenth century scientists-one who developed the laboratory burner
in common use today, and the other who studied the spectra of colored flames
produced by a variety of elements,

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Answer:

common use today, and the other who studied the spectra of colored flames produced by a variety of elements. The two scientists are Robert Bunsen, whose name is associated with today's laboratory burner, and William Kirchhoff, who studied the flame spectra produced by a variety of elements. 4

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