August 2008 Chemistry Regents #1-10

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Questions 1-10 Questions 11-20 Questions 21-30 Questions 31-40 Questions 41-50
 

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Answer Explanations
1 In the wave-mechanical model of the atom, orbitals are regions of the most probable locations of
(1) protons      (3) neutrons
(2) positrons    (4) electrons		 4 electrons occupy orbitals
2 Which phrase describes an atom?
(1) a positively charged electron cloud surrounding a positively charged nucleus
(2) a positively charged electron cloud surrounding a negatively charged nucleus
(3) a negatively charged electron cloud surrounding a positively charged nucleus
(4) a negatively charged electron cloud surrounding a negatively charged nucleus		 3 nucleus is positive (protons and neutrons)

cloud negative  (electrons)
3 Which total mass is the smallest?
(1) the mass of 2 electrons
(2) the mass of 2 neutrons
(3) the mass of 1 electron plus the mass of 1 proton
(4) the mass of 1 neutron plus the mass of 1 electron		 1 electrons 1/1836 amu

protons 1 amu

neutrons 1 amu
4 Elements on the modern Periodic Table are arranged in order of increasing
(1) atomic mass
(2) atomic number
(3) number of neutrons
(4) number of valence electrons		 2 atomic number, look at the PT
5 As the elements of Group 17 are considered in order of increasing atomic number, there is an increase in
(1) atomic radius
(2) electronegativity
(3) first ionization energy
(4) number of electrons in the first shell		 1 table S
4 mass #

                Element

Atomic #
7 Which element is a metal that is in the liquid phase at STP?
(1) bromine   (3) hydrogen
(2) cobalt      (4) mercury		 4 mercury (just know it)
8 Which list of formulas represents compounds, only?
(1) CO2, H2O, NH3     (3) H2, Ne, NaCl
(2) H2, N2, O2             (4) MgO, NaCl, O2		 1 2 elements, so 2 CAPITAL letters
9 What is the chemical formula for iron(III) oxide?
(1) FeO        (3) Fe3O
(2) Fe2O3    (4) Fe3O=		 2 Fe3+ O2-

Fe2O3
10 An atom of which element has the greatest attraction for the electrons in a bond with a hydrogen atom?
(1) chlorine         (3) silicon
(2) phosphorus   (4) sulfur		 1 Definition of electronegativity Table S

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