homework 3KEY spr08

homework 3KEY spr08 - CHEM 1016 Homework #3 Posted: January...

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CHEM 1016 Homework #3 Posted: January 21, 2008 Due: Tuesday, January 29, 2008 Choose the correct response to each of the following multiple choice questions and fill in the corresponding space on your orange opscan. 1. Which person(s) won two Nobel prizes (one in physics; the other in chemistry) for work with radioactivity? 1. Antoine Henri Bequerel 2. Marie Sklodowska Curie***** 3. Pierre Curie 4. Marie and Pierre Curie 2. Which type of radioactivity is not deflected by a magnetic field? 1. alpha 2. beta 3. gamma***** 4. delta 5. iota 3. The nuclear model of the atom was constructed from which fundamental experiment? 1. alpha particle scattering by thin metal foils***** 2. cathode ray behavior in electrical fields 3. atomic spectra from gas discharge tubes 4. electrolysis of water 4. Essentially, all of the mass of an atom is due to the 1. protons. 2. neutrons. 3. nucleons.***** 4. electrons. 5. The element tin, Sn, occurs naturally as ten isotopes. Each of these isotopes may have 1. 50 protons. 2. 50 electrons. 3. a different number of neutrons. 4. Wow, this can get complicated. Each may have 50 electrons if we are talking about electrically neutral atoms, but each will necessarily have 50 protons and a different number of neutrons if the atoms are to be defined as isotopes of each other.*****
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6. How many nucleons are in an atom of the isotope Sn-106? 1. 50 2. 56 3. 106**** 4. 156 7. With the discovery of isotopes, which postulate of Dalton's original atomic theory was necessarily modified? 1. Matter is made up of atoms. 2. Atoms combine with other atoms in whole number ratios to form compounds. 3. Atoms of the same element are identical.***** 4. In chemical reactions, the arrangement of atoms is changed. 8. The isotope of hydrogen that contains two neutrons is 1. deuterium. 2. hydrogen. 3. monoterium. 4. protium. 5. dihydrogen. 6. tritium.***** 9. When an electron in an excited atom falls down to a lower energy level, the excited atom emits a characteristic 1. electron. 2. neutron. 3. photon.**** 4. proton. 10.
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homework 3KEY spr08 - CHEM 1016 Homework #3 Posted: January...

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