Sample Homework Question no.1

Course: Chemistry
Level: High School

Question:
Without stratospheric ozone (O3), harmful solar radiation would cause gene alterations. Ozone forms when O2 breaks and each O atom reacts with another O2 molecule. It is destroyed by reaction with Cl atoms formed when the C-Cl bond in synthetic chemicals breaks.

1. Find the wavelengths of light that can break the C-Cl bond AND the bond in O2.
2. Carbon-carbon bonds form the 'backbone' of nearly every organic and biological molecule. The average bond energy of the C-C bond is 347 kJ/mol. Calculate the frequency and wavelength of the least energetic photon that can break an average C-C bond. In what region of the electromagnetic spectrum is this radiation?

Answer:
1. The C-Cl bond has an energy of 339 kJ/mol, the O=O bond has an energy of 498 kJ/mol. The formula used here will be:

2. Carbon-carbon bonds form the 'backbone' of nearly every organic and biological molecule. The average bond energy of the C-C bond is 347 kJ/mol. Calculate the frequency and wavelength of the least energetic photon that can break an average C-C bond. In what region of the electromagnetic spectrum is this radiation?

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