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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AnswerExplanations
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		4electrons 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		3nucleus 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		1electrons 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		2atomic 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		1table S
4mass #

                Element

Atomic #

7 Which element is a metal that is in the liquid phase at STP?
(1) bromine   (3) hydrogen
(2) cobalt      (4) mercury		4mercury (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		12 elements, so 2 CAPITAL letters
9 What is the chemical formula for iron(III) oxide?
(1) FeO        (3) Fe3O
(2) Fe2O3    (4) Fe3O=		2Fe3+ 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		1Definition of electronegativity Table S

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

 
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