Page 371 - Chemistry eBook

H
H
C C C H H Cl ( 3 )
H
According to one acid-base theory, the H2O(l) molecules act as
l
(1) a base because they accept H􏰁 ions (2) a base because they donate H􏰁 ions (3) an acid because they accept H􏰁 ions
HHH
H HCCCH
H Cl H ( 4)
􏰁
represents an unsaturated
(3) C3H8 (4) C4H10
easily reduced?
(3) Co2􏰁 (4) Ca2􏰁
50
Which equation represents natural transmutation? (1) 105B 􏰁 42He → 137N 􏰁 10n
Sample Regents Que
(4) an acid because they donate H ions
49 Which equation represents an oxidation- reduction reaction?
(1) H􏰁 􏰁OH􏰀 →H2O (2) 238U → 234Th 􏰁 4He
92 90 2
(3) Zn 􏰁 Sn4􏰁 → Zn2􏰁 􏰁 Sn2􏰁
(4) 3AgNO3 􏰁 Li3PO4 → Ag3PO4 􏰁 3LiNO3
(2) 14C→14N􏰁 0e 6 7 􏰀1
(3) S􏰁2e􏰀 →S2􏰀 (4) Na→Na􏰁 􏰁e􏰀
stions
June 2012 #49
Answer: Choice #3
Answer
Explanation: Zn’s oxidation state went up, and Sn’s oxidation state went down. Since one oxidation state went up and the other one went down, it must be an oxidation-reduction reaction.
Usually, we first need to assign oxidation states and then see which element's oxidation state went up or down. But in this example, the Regents luckily gave us that info.
UNIT 10: OXIDATION & REDUCTION © 370