Question

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Dry Lab Questions Circle the questions that have been assigned. What experimental evidence leads scientists to believe that only quantized electronic energy states exist in atoms . What is the wavelength range of the visible spectrum tor electromagnetic radiation? What is the color of the short wavelength region of the visible spectrum ? If a substance absorbed the wavelengths from the short wavelength region to the visible spectrum, what would be its color? Explain why "roses are red and violets are blue." Is the energy absorption associated with bands in an infrared spectrum of higher or lower energy than the lines appearing in a visible line spectrum? Explain. Identify the type of energy transition occurring in a molecule that causes a band to appear in an infrared spectrum. Identify the type of energy transition occurring in an atom that causes a line to appear in a visible line spectrum.

Answer 1

1) the experimental evidence is the spectral lines of hydrogen , in which the energy

is quantized

2) a) 390 - 700 nm

b) violet

c) red

3) roses are red and violets are blue because we see the color that is being reflected. All the other colors

in the visible spectrum are being absorbed .

4) a) lower , because photons in infrared has higher wavelength than visible and thus

less energy when compared to visible .

b) due to vibrations and rotations of atoms in the molecule .

c) due to excitation and de excitation of electrons in atoms .