Cliffs AP Chemistry, 3rd Edition

Samples: Multiple-Choice Questions

Questions 1–3

A. γ

B. 11 H

C. 01 n

D. 24 He

E. 2 01 n

1. 2654 Fe++?" 2656 Fe 211 H

Answer: D

Think of the yield sign (arrow) as an equal sign. The superscript represents the mass number.
The sum of the mass numbers on both sides of the arrow must be equal. The subscript repre-
sents the atomic number, and as with mass numbers, the sum of the numbers on both sides of
the arrow must be equal.

mass: 54 + 4= 56 + 2(1)

atomic number: 26 + 2= 26 + 2(1)

2. 2965 Cu++ 01 n" 2964 Cu?

Answer: E

mass: 65 + 1 = 64 + 2(1)

atomic number: 29 + 0 = 29 + 2(0)

3.^147 NH O++^11 "^158?

Answer. A

mass: 14 + 1 = 15 + 0

atomic number: 7 + 1 = 8 + 0

Nuclear Chemistry