Part C Refer to Ebbing and Gammon, Examples 9.7,9.11,9.12, 10.1, and 10.5, as we

Question

Part C Refer to Ebbing and Gammon, Examples 9.7,9.11,9.12, 10.1, and 10.5, as well as Figures 10.4 and 10.8. Complete the molecular geometry table for the following substances and ions. The central atom is boldfaced and italicized. COBr2, CICN, PF, H2N (Each has a central atom that follows the octet rule.) PFs, IFs, XeC, So (Each has a central atom with more than eight valence e's) Lab Questions Beta-carotene absorbs primarily blue and violet light in the visible spectrum. Explain why it appears orange. Do you see the light that is absorbed? What do you see instead? 1. Molecular vibrational transitions absorb infrared radiation, while electronic transitions of double bonds absorb ultraviolet radiation. Use Figure 7.5 in Ebbing, along with the equations E-hc/h and E-hv, to explain how the energies of infrared and ultraviolet compare with visible light transitions. That is, do they have higher or lower energies than visible light? 2. Suppose an atom absorbs a photon and undergoes a quantized transition from a lower energy level to a higher energy level. Explain how you would mathematically determine the energy and frequency of the photon That is, explain the concept of E for the two energy levels. 3.

Explanation / Answer

1. The visible light (colorless by naked eye) is consist of seven colours as VIBGYOR (Violet,indigo,blue,green,yellow,orange and red).

The object upon which the visible light falls absorbs only one color and reflect the complementary color of the absorbed color to the observer and emit all other Colors.

Complementary Colors are as follows:

Blue=Orange

Red=green

Violet=Yellow.

Now the beta-carotene absorbs the blue color of white light and reflect its complementary Orange color and emit all other.

That's why it appears orange in visible light.

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