August 2005 Chemistry Regents #21-30

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

 

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21 Given the reaction system in a closed container at equilibrium and at a temperature of 298 K:
N2O4(g) <==>2NO2(g)
The measurable quantities of the gases at equilibrium must be
(1) decreasing    (3) equal
(2) increasing     (4) constant
4 concentrations are constant and rates are equal
22 Atoms of which element can bond with each other to form ring and chain structures in compounds?
(1) C     (3) H
(2) Ca   (4) Na
1 organic chem. question...carbon
23 In a voltaic cell, chemical energy is converted to
(1) electrical energy, spontaneously
(2) electrical energy, nonspontaneously
(3) nuclear energy, spontaneously
(4) nuclear energy, nonspontaneously
1 see answer
4 highest temp and concentration
25 Which aqueous solution is the best conductor of an electrical current?
(1) 0.01 M CH3OH (3) 0.1 M CH3OH
(2) 0.01 M KOH (4) 0.1 M KOH
4 highest Molarity and acid, base or salt
26 A hydrogen ion, H+, in aqueous solution may also be written as
(1) H2O         (3) H3O+
(2) H2O2         (4) OH
3 H+ = H3O+
27 One acid-base theory states that an acid is
(1) an electron donor    (3) an H+ donor
(2) a neutron donor     (4) an OH donor
3 acids=H+ donor

bases= H+ acceptor

28 Which isotope will spontaneously decay and emit particles with a charge of +2?
(1) 53Fe      (3) 198Au
(2) 137Cs    (4) 220Fr
4 table N
29 Radioactive cobalt-60 is used in radiation therapy treatment. Cobalt-60 undergoes beta decay. This type of nuclear reaction is called
(1) natural transmutation
(2) artificial transmutation
(3) nuclear fusion
(4) nuclear fission
1 nothing else is needed=natural
30 Given the balanced ionic equation:
2Al(s) + 3Cu2+(aq)==> 2Al3+(aq) + 3Cu(s)
Compared to the total charge of the reactants, the total charge of the products is
(1) less
(2) greater
(3) the same
3 the same, charge is conserved

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

 
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