Chem Jan 2012 Regents

50 Questions  I  By Ionca
CHEM JAN 2012 REGENTS
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1.  At standard pressure, CH4 boils at 112 K and H2O boils at 373 K. What accounts for the higher boiling point of H2O at standard pressure? 
A.
B.
C.
D.
2.  Which particle has the least mass?
A.
B.
C.
D.
3.  Which atom in the ground state has an outermost electron with the most energy? 
A.
B.
C.
D.
4.  A sealed, rigid 1.0-liter cylinder contains He gas at STP. An identical sealed cylinder contains Ne gas at STP. These two cylinders contain the same number of 
A.
B.
C.
D.
5.  Functional groups are used to classify    
A.
B.
C.
D.
6.  Which compound is formed from its elements by an exothermic reaction at 298 K and 101.3 kPa? 
A.
B.
C.
D.
7.  What occurs in order to break the bond in a Cl2 molecule? 
A.
B.
C.
D.
8.  The elements in Group 2 are classified as    
A.
B.
C.
D.
9.  A solution consists of 0.50 mole of CaCl2 dissolved in 100. grams of H2O at 25°C. Compared to the boiling point and freezing point of 100. grams of H2O at standard pressure, the solution at standard pressure has 
A.
B.
C.
D.
10.  Which Lewis electron-dot diagram represents a molecule having a nonpolar covalent bond? 
A.
B.
C.
D.
11.  Systems in nature tend to undergo changes toward 
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B.
C.
D.
12.  What is the total number of valence electrons in a germanium atom in the ground state? 
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B.
C.
D.
13.  In a propanal molecule, an oxygen atom is bonded with a carbon atom.  What is the total number of pairs of electrons shared between these atoms?
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B.
C.
D.
14.  A 2400.-gram sample of an aqueous solution contains 0.012 gram of NH3. What is the concentration of NH3 in the solution, expressed as parts per million? 
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B.
C.
D.
15.  In the wave-mechanical model of the atom, an orbital is the most probable location of 
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B.
C.
D.
16.  What is the number of electrons in an atom that has 3 protons and 4 neutrons? 
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B.
C.
D.
17.  An ion that consists of 7 protons, 6 neutrons, and 10 electrons has a net charge of 
A.
B.
C.
D.
18.  What is the number of electrons in a completely filled second shell of an atom? 
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B.
C.
D.
19.  At which temperature is the vapor pressure of ethanol equal to 80. kPa? 
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B.
C.
D.
20.  Which equation represents a change that results in an increase in disorder? 
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B.
C.
D.
21.  Which list includes elements with the most similar chemical properties? 
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B.
C.
D.
22. 
Given the balanced ionic equation representing a reaction:  Which half-reaction represents the reduction that occurs? 
A.
B.
C.
D.
23.  Which element is paired with an excited-state electron configuration for an atom of the element? 
A.
B.
C.
D.
24.  Which formula represents the product of the addition reaction between ethene and chlorine, Cl2? 
A.
B.
C.
D.
25.  Which class of compounds contains at least one element from Group 17 of the Periodic Table?
A.
B.
C.
D.
26.  Which atom attains a stable valence electron configuration by bonding with another atom? 
A.
B.
C.
D.
27.  Given the balanced equations representing two chemical reactions:      Cl2 + 2NaBr → 2NaCl + Br2      2NaCl → 2Na + Cl2 Which types of chemical reactions are represented by these equations? 
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B.
C.
D.
28.  Some solid KNO3 remains at the bottom of a stoppered flask containing a saturated KNO3(aq) solution at 22°C. Which statement explains why the contents of the flask are at equilibrium? 
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B.
C.
D.
29.  As a result of the gold foil experiment, it was concluded that an atom 
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B.
C.
D.
30.  Which sample of matter is classified as a substance? 
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B.
C.
D.
31.  When dissolved in water, an Arrhenius base yields
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B.
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D.
32.  Which pair represents two forms of an element in the same phase at STP but with different structures and different properties? 
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B.
C.
D.
33.  What is the IUPAC name for the compound ZnO? 
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B.
C.
D.
34.  Based on Reference Table J, which two reactants react spontaneously? 
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B.
C.
D.
35.  An ionic bond can be formed when one or more electrons are 
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B.
C.
D.
36.  Which statement describes the particles of an ideal gas according to the kinetic molecular theory? 
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B.
C.
D.
37.  At 25°C, gas in a rigid cylinder with a movable piston has a volume of 145 mL and a pressure of 125 kPa. Then the gas is compressed to a volume of 80. mL. What is the new pressure of the gas if the temperature is held at 25°C? 
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B.
C.
D.
38.  Which quantity is equal to 50 kilojoules?    
A.
B.
C.
D.
39.  Which element has the lowest electronegativity value? 
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B.
C.
D.
40.  Which statement describes the distribution of charge in an atom? 
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B.
C.
D.
41. 
Given the balanced equation representing a nuclear reaction:  Which phrase identifies and describes this reaction? 
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B.
C.
D.
42. 
Given the equation and potential energy diagram representing a reaction:  If each interval on the axis labeled “Potential Energy (kJ/mol)” represents 10. kJ/mol, what is the heat of reaction? 
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B.
C.
D.
43. 
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D.
44.  Which sample of CO2 has a definite shape and a definite volume? 
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B.
C.
D.
45.  A mixture of sand and table salt can be separated by filtration because the substances in the mixture differ in 
A.
B.
C.
D.
46.  When a voltaic cell operates, ions move through the 
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B.
C.
D.
47. 
Given the equation representing a reversible reaction:  According to one acid-base theory, the reactant that donates an H+ ion in the forward reaction is 
A.
B.
C.
D.
48.  The elements on the Periodic Table are arranged in order of increasing 
A.
B.
C.
D.
49.  When the pH value of a solution is changed from 2 to 1, the concentration of hydronium ions 
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B.
C.
D.
50.  Which statement describes a chemical change?    
A.
B.
C.
D.
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