Chapter 2 & 21Supplemental InstructionIowa State University

Leader: Cody Course: Chemistry 177

Instructor: Dr. Schewe-MillerDate: 1/24/11

1. Define:a. Empirical Formula:

b. Molecular Formula:

c. α particles:

d. β particles:

e. γ rays:

2. Label the Alkali Metals, Alkaline Earth Metals, Halogens, Chalcogens, Noble Gases, Transition Metals, and Metalloids.

3. Write the empirical formula corresponding to each of the following molecular formulas:a. Al2Br6

b. C8H10

c. C4H8O2

d. P4O10

e. C6H4Cl2

f. B3N3H6

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4. Label what type of radioactive decay that a particular radionuclide undergoes to become more stable for:

a. A nuclei above the belt of stability (high neutron-to-proton ratio)

b. A nuclei below the belt of stability (low neutron-to-proton ratio)

c. A nuclei with atomic numbers ≥84

5. Write the balanced nuclear equations for the following process:a. Rb-90 undergoes beta decay

b. Se-72 undergoes electron capture

c. Kr-76 undergoes positron emission

d. Ra-226 emits alpha radiation

6. Write the balanced nuclear equation for the reaction represented by the diagram shown here.

60.5 61 61.5 62 62.5 63 63.5 64 64.50123456789

10

Number of Neutrons

Num

ber o

f Pro

tons

48

47

46

45