CHEM 219 Module 2 problem set Questions with Verified Correct Answers

CHEM 219 Module 2 problem set Questions with Verified Correct Answers The atomic radii of zirconium (Zr) and hafnium (Hf) are nearly the same despite the fact that hafnium has 32 more protons and electrons. Which of the following bests explains this phenomenon? - ANS - Hafnium contains electrons in the 4f orbitals. These 4f electrons do not effectively shield the higher nuclear charge and thus Zeff is higher than might be otherwise expected. Which of the following is true concerning successive ionizations of an atom and its ions? - ANS - Each successive ionization requires increasing amounts of energy The energy of a photon equals its Planck's constant (h) multiplied by the speed of light(c) and then divided by the wavelength. E = hc/λ. If microwaves are changed to x-rays, what effect does this have on the energy of the photon - ANS - The energy of the photon increases Photons are shone on a piece of metal and one electron is ejected for each absorbed photon. What happens when the wavelength of light is decreased? - ANS - The ejected electrons would have greater kinetic energy What type of light on the electromagnetic spectrum has the highest energy per photon? X-ray visible light microwaves Gamma waves - ANS - Gamma waves