June 2007 Chemistry Regents #21-30
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|21 A double carbon-carbon bond is found in a molecule of
(1) pentane (3) pentyne
(2) pentene (4) pentanol
|22 Which changes occur when Pt2+ is reduced?
(1) The Pt2+ gains electrons and its oxidation number increases.
(2) The Pt2+ gains electrons and its oxidation number decreases.
(3) The Pt2+ loses electrons and its oxidation number increases.
(4) The Pt2+ loses electrons and its oxidation number decreases.
gain electrons reduction
oxidation number decrease
|23 Which balanced equation represents an
(1) BaCl2 + Na2SO4==>BaSO4 + 2NaCl
(2) C+H2O ==>CO + H2
(3) CaCO3==>CaO + CO2
(4) Mg(OH)2 + 2HNO3==>Mg(NO3)2 + 2H2O
|2||look for the lone element|
|24 Which energy conversion occurs during the operation of
a voltaic cell?
(1) Chemical energy is spontaneously converted to electrical energy.
(2) Chemical energy is converted to electrical energy only when an external power source is provided.
(3) Electrical energy is spontaneously converted to chemical energy.
(4) Electrical energy is converted to chemical energy only when an external power source is provided.
|1||definition of a voltaic cell|
|25 An Arrhenius base yields which ion as the only negative
ion in an aqueous solution?
(1) hydride ion (3) hydronium ion
(2) hydrogen ion (4) hydroxide ion
|26 According to one acid-base theory, a water molecule
acts as an acid when the water molecule
(1) accepts an H+ (3) donates an H+
(2) accepts an OH– (4) donates an OH–
|3||acid donates a H+|
|27 Which list of radioisotopes contains an alpha emitter,
a beta emitter, and a positron emitter?
(1) C-14, N-16, P-32
(2) Cs-137, Fr-220, Tc-99
(3) Kr-85, Ne-19, Rn-222
(4) Pu-239, Th-232, U-238
|28 Which nuclear decay emission consists of energy, only?
(1) alpha particle (3) gamma radiation
(2) beta particle (4) positron
|3||gamma- that is what it is|
|4||fusion 2 small atoms reacting to
form a large one
REGENTS ONLY use hydrogen
|30 The energy released by a nuclear reaction results
primarily from the
(1) breaking of bonds between atoms
(2) formation of bonds between atoms
(3) conversion of mass into energy
(4) conversion of energy into mass
|3||Energy comes from mass|
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