January 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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Questions

Answer Explanations
1 Which quantity identifies an element?
(1) atomic number
(2) mass number
(3) total number of neutrons in an atom of the
element
(4) total number of valence electrons in an atom
of the element
1  
2 Which atom in the ground state has a partially
filled second electron shell?
(1) hydrogen atom (3) potassium atom
(2) lithium atom (4) sodium atom
2  
3 What is the total charge of the nucleus of a
nitrogen atom?
(1) +5 (3) +7
(2) +2 (4) +14
3  
4 Which value of an element is calculated using
both the mass and the relative abundance of
each of the naturally occurring isotopes of this
element?
(1) atomic number (3) half-life
(2) atomic mass (4) molar volume
2  
5 The mass of 12 protons is approximately equal to
(1) 1 atomic mass unit
(2) 12 atomic mass units
(3) the mass of 1 electron
(4) the mass of 12 electrons
2  
6 Sodium atoms, potassium atoms, and cesium
atoms have the same
(1) atomic radius
(2) first ionization energy
(3) total number of protons
(4) oxidation state
4  
7 Which statement describes a chemical property
of hydrogen gas?
(1) Hydrogen gas burns in air.
(2) Hydrogen gas is colorless.
(3) Hydrogen gas has a density of 0.000 09 g/cm3
at STP.
(4) Hydrogen gas has a boiling point of 20. K at
standard pressure.
1  
8 Which element has the greatest density at STP?
(1) calcium (3) chlorine
(2) carbon (4) copper
4  
9 Which equation shows conservation of atoms?
(1) H2 + O2 H2O
(2) H2 + O2 2H2O
(3) 2H2 + O2 2H2O
(4) 2H2 + 2O2 2H2O
3  
10 Which term indicates how strongly an atom
attracts the electrons in a chemical bond?
(1) alkalinity
(2) atomic mass
(3) electronegativity
(4) activation energy
3  

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

 
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