Page 376 - Chemistry eBook

pressure, the solution at standard pressure has
equilibrium?
(1) a lower boiling point and a lower freezing point
(2) a lower boiling point and a higher freezing point
(1) The rate of dissolving is equal to the crystallization.
(2) The rate of dissolving is greater than t of crystallization.
(3) The concentration of the solid is equal concentration of the solution.
(4) The concentration of the solid is g than the concentration of the solution
Which formula represents the product addition reaction between ethene and ch Cl2?
Cl Cl CI CI
Cl C C CI H C C H HH HH
(1 ) (3 )
Cl Cl CI H HCCH HCCH HH HH
(2 ) (4 )
BasedonReferenceTableJ,whichtwore react spontaneously?
(3) a higher boiling point and a lower freezing point
Sample Regents Questions
(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
that occurs?
(1) Al → Al3+ + 3e (2) Al3+ +3e →Al (3) Cu→Cu2+ +2e (4) Cu2+ +2e →Cu
ac
Choice #4
Explanation: GER left: Since the oxidation state of Cu dropped from two to
zero we know it must be a reduction reaction.
A + B
tio
n
:
46
44 Giventheequationandpotentialenergydiagram
J
#43
a
n
2
representi
Answer
ng
a
re
0
1
2
A +B C
Reaction Coordinate
(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
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
(3) +30. kJ/mol (4) +40. kJ/mol
P.S./Chem.–Jan. ’12
[6]
C
47
48
WhenthepHvalueofasolutionischange 2 to 1, the concentration of hydronium io
(1) Mg(s) + ZnCl2(aq) (3) Pb(s) + ZnC (2) Cu(s) + FeSO4(aq) (4) Co(s) + NaC
r h
o l
a l
d n
375 ©
UNIT 10: OXIDATION & REDUCTION
Potential Energy (kJ/mol)