January 2009 Chemistry Regents #1-10

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Questions 1-10 Questions 11-20 Questions 21-30 Questions 31-40 Questions 41-50 Questions 51-53 Questions 54-55 Questions 56-58 Questions 59-61 Questions 62-64 Questions 65-66 Questions 67-68 Questions 69-71 Questions 72-74 Questions 75-77 Questions 78-79 Questions 80-81

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Questions	Answer	Explanations
1 On the modern Periodic Table, the elements are arranged in order of increasing (1) atomic mass      (3) mass number (2) atomic number  (4) oxidation number	2	atomic number , the masses have a few hiccups
2 Which particle has a mass that is approximately the same as the mass of a proton? (1) an alpha particle (3) a neutron (2) a beta particle (4) a positron	3	neutron 1 amu proton 1 amu
3 An atom of an element forms a 2+ ion. In which group on the Periodic Table could this element be located? (1) 1 (3) 13 (2) 2 (4) 17	2	group 2 are 2+
4 Which statement describes the relative energy of the electrons in the shells of a calcium atom? (1) An electron in the first shell has more energy than an electron in the second shell. (2) An electron in the first shell has the same amount of energy as an electron in the second shell. (3) An electron in the third shell has more energy than an electron in the second shell. (4) An electron in the third shell has less energy than an electron in the second shell.	3	the higher the energy level the greater the energy
5 According to the electron-cloud model of the atom, an orbital is a (1) circular path traveled by an electron around the nucleus (2) spiral path traveled by an electron toward the nucleus (3) region of the most probable proton location (4) region of the most probable electron location	4	definition of an orbital
6 What can be determined if only the atomic number of an atom is known? (1) the total number of neutrons in the atom, only (2) the total number of protons in the atom, only (3) the total number of protons and the total number of neutrons in the atom (4) the total number of protons and the total number of electrons in the atom	4	atom protons equal electrons atomic number are the # of protons
	2	see table N for example
8 Which Group 14 element is a metalloid? (1) tin         (3) lead (2) silicon   (4) carbon	2	on the staircase
9 Samples of four Group 15 elements, antimony, arsenic, bismuth, and phosphorus, are in the gaseous phase. An atom in the ground state of which element requires the least amount of energy to remove its most loosely held electron? (1) As     (3) P (2) Bi      (4) Sb	2	definition of Ionization energy, Table S
10 Which substance can be broken down by chemical means? (1) CO    (3) Ca (2) Ce     (4) Cu	1	definition of a compound