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he potential energy diagram for a e chemical reaction:
Sample Regents Questions
Reaction Coordinate
erval on the axis labeled “Potential kJ/mol)” represents 10. kilojoules per hat is the activation energy of the eaction?
reaction:
H2O(l) 􏰂 HCl(g) → H3O􏰂(aq) 􏰂 Cl􏰀(aq)
Jan 2014 #46
47 Given the balanced equation representing a
According to one acid-base theory, the H2O(l)
molecules
(1) accept H􏰂 ions (2) accept OH􏰀 ions
48 When an atom of the unstable isotope Na-24
J/mol (3) 40. kJ/mol J/mol (4) 60. kJ/mol
(3) donate H􏰂 ions (4) donate OH􏰀 ions
ndensed structural formula represents HCHCH3 (3) CH3CH3
decays, it becomes an atom of Mg-24 because
Choice #2
the Na-24 atom spontaneously releases
rated compound? Explanation: Oxidation occurs at the anode (an ox). During oxidation, electrons
H CH (4) CHare lost (LEO). 234
(1) an alpha particle (2) a beta particle
(3) a neutron (4) a positron
element reacts spontaneously with Cl(aq) at room temperature?
er (3) silver (4) zinc
e balanced ionic equation:
(aq) 􏰂 2Cr(s) → 3Pb(s) 􏰂 2Cr3􏰂(aq)
49 Which balanced equation represents nuclear fusion?
(1)3H→3He􏰂 0e 1 2 􏰀1
(2) 235U → 231Th 􏰂 4He 92 90 2
(3) 21H 􏰂 21H → 42He
(4) 235U􏰂1n→90Sr􏰂143Xe􏰂31n 92 0 38 54 0
46 What occurs at one of the electrodes in both an electrolytic cell and a voltaic cell?
(1) Oxidation occurs as electrons are gained at the cathode.
(2) Oxidation occurs as electrons are lost at the anode.
(3) Reduction occurs as electrons are gained at the anode.
(4) Reduction occurs as electrons are lost at the cathode.
Answer
t
( W r
o u
C C
UNIT 10: OXIDATION & REDUCTION © 398