benabdallahayeah4Lv1

9 Apr 2023

Directions: Answer each of the following questions.

1. One isotope of Br has a half-life of 16.5 hours. How much of a 2.00-gram sample remains at the end of 1.00 day?

2. If 160 grams of a 200-gram sample of gold-198 decay in 6.25 days, what is the half-life of gold-198?

3. The symbol for an electron also used to represent a(n)

a. Alpha particle

b. Beta particle

c. Positron

d. Gamma-ray

4. During a fission reaction:

a. A larger and more stable nucleus is formed

b. Energy is absorbed

c. Positrons are always released

d. Smaller and more stable nuclei are formed

5. The half-life of a radioactive isotope

a. Changes over time

b. Is constant

c. Is a characteristic of stable isotopes

d. Decreases in value as time passes

6. Radioactive dating is used to determine the

a. Half-life of a radioactive isotope

b. Type of particle emitted by an isotope as it decays

c. Age of a specimen

d. Time required for half of a radioactive sample to decay

7. Carbon-11 has a half-life of 20 minutes. Explain what this means.

8. Conduct research to identify two naturally occurring radioactive elements and two synthetic radioactive elements.

CRITICAL THINKING:

9. Conduct research to explain how fusion differs from fission. How are the two processes alike? How are they different? (Compare and contrast) Don’t forget to cite your resources.