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A +B C
(4) a higher boiling point and a higher freezing point
43 Given the balanced ionic equation representing a reaction:
2Al(s) + 3Cu2+(aq) → 2Al3+(aq) + 3Cu(s) Which half-reaction represents the reduction
(4) The concentration of the solid is greater than the concentration of the solution.
46 Which formula represents the product of the addition reaction between ethene and chlorine, Cl2?
C
( 2) ( 4
47 BasedonReferenceTableJ,wh react spontaneously?
44 Giventheequationandpotentialenergydiagram representing a reaction:
A +B C
C
A+B
(3) +30. kJ/mol (4) +40. kJ/mol
47
48
WhenthepHvalueofasolutionischangedfrom
[6]
Cl Cl
Cl C C CI H C C H
Cl Cl
HCCH HCCH
48 When the pH value of a solutio 2 to 1, the concentration of hyd
(1) decreases by a factor of 2 (2) increases by a factor of 2 (3) decreases by a factor of 10 (4) increases by a factor of 10
CI H HH HH
(2 )
BasedonR react spon (1) Mg(s) (2) Cu(s)
Reaction Coordinate
(4 )
If each interval on the axis labeled “Potential Energy (kJ/mol)” represents 10. kJ/mol, what is
Reaction Coordinate
eference Table J, which two reactants
tatnheeouhslye?at of reaction?
+ ZnCl (aq) (3) Pb(s) + ZnCl (aq) 22
(1) +60. kJ/mol (3) +30. kJ/mol + FeSO4(aq) (4) Co(s) + NaCl(aq)
(2) +20. kJ/mol (4) +40. kJ/mol
P.S./Chem.–Jan. ’12
2 to 1, the concentration of hydronium ions (1) decreases by a factor of 2
(2) increases by a factor of 2
(3) decreases by a factor of 10
CI CI
(1) Mg(s) + ZnCl2(aq) (2) Cu(s) + FeSO4(aq)
(3) P (4) C
that occurs?
(1) Al → Al3+ + 3e (2) Al3+ +3e →Al (3) Cu → Cu2+ + 2e (4) Cu2+ + 2e → Cu
Sample Regents Questions
H H H H
( 1 )
A+B
( 3 )
If each interval on the axis labeled “Potential Energy (kJ/mol)” represents 10. kJ/mol, what is the heat of reaction?
(1) +60. kJ/mol
(2) +20. kJ/mol P.S./Chem.–Jan. ’12
Choice #3
(4) increases by a factor of 10
Jan 2012 #44
[6]
Answer
Heat of reaction is the space between the A+B line and the C line. If each line represents 10 kJ/mol, then the A+B line = 20 kJ/mole and line C = 50 kJ/mol.
50 - 20= 30 kJ/mol.
b o
n
313 © UNIT 8: KINETICS AND EQUILIBRIUM
Potential Energy (kJ/mol)
Potential Energy (kJ/mol)