Quimica.
Enviado por PerlaaEsmeralda • 25 de Marzo de 2014 • Exámen • 428 Palabras (2 Páginas) • 191 Visitas
a) The effect of the light over valence electrons
It’s called “The photoelectric effect”, is the emission of electrons from a material when it is incident by an electromagnetic radiation (visible or ultraviolet light in general)
b) What is an emission spectrum?
An emission spectrum is the electromagnetic radiation (EMR), such as visible light, a substance emits. Every element gives off a unique fingerprint of light, so analyzing the frequencies of this light helps identify the chemical that generated it. This procedure is called emission spectroscopy and is a very useful scientific tool.
c) The typical colors of a flame in relation to different elements
Symbol
Name
Color
Image
As
Arsenic
Blue
B
Boron
Bright green
Ba
Barium
Pale/Apple green
Ca
Calcium
Brick red
Cs
Caesium
Blue-Violet
Cu(I)
Copper(I)
Bluish-green
Cu(II)
Copper(II) (non-halide)
Green
Cu(II)
Copper(II) (halide)
Blue-green
Fe
Iron
Gold
In
Indium
Blue
K
Potassium
Lilac
Li
Lithium
Red
Mn (II)
Manganese (II)
Yellowish green
Mo
Molybdenum
Yellowish green
Na
Sodium
Intense yellow
P
Phosphorus
Pale bluish green
Pb
Lead
Blue/white
...