Microwave ovens use microwave radiation to heat food. The energy of the microves is absorbed by water molecules in the food and then transferred to the rest of the food. Suppose the microwave radiation has a wavelength of 11.2 cm. How many photons are required to heat 2.00  102 mL of coffee from 23 to 60 oC? If the power of the microwave is 9.00  102 W (1 Watt = 1 Joule/second), how long would you have to heat the coffee?

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Quantum Chemistry

Quantum chemistry deals with the properties of chemical systems and their reactions. The branch of chemistry which is more concerned with quantum chemistry is physical chemistry. It is a more sophisticated field of theoretical physics which is concerned towards the application of physical concepts towards various chemical aspects such as, formation of atoms, chemical structure descriptions, chemical bond strength, hybridization, conjugation etc. Quantum chemistry mainly studies the various states i.e., ground state, excited state, transition states of the individual atoms or molecules taking place during any chemical reaction. The laws of motion explained by various scientists, which are termed as “classical mechanics” were not acceptable in terms of electrons, protons, atoms, light etc. Thus, a new theory named “quantum mechanics” emerged to understand the basic framework of various atomic and subatomic particles.