Nuclear Chemistry: Chain Reactions and Half-Life

Multiple Choice

Which of the following BEST describes what occurs in a fusion reaction?

• Two low mass nuclei are joined to form one nucleus and gives off energy.

• A single nucleus divides into two or more nuclei and gives off energy.

• Electrons are shared between the nuclei.

• A chemical reaction occurs between the nuclei.

Multiple Choice

The high energy yields created by nuclear fission are due to...

• binding nuclei.

• hydrogen bonding.

• secondary recovery.

• chain reactions.

Multiple Choice

Which reaction produces harmful radioactive waste?

• Fission

• Photosynthesis

• chain reaction

• Fusion

Multiple Choice

What is a chain reaction?

• When electrons are emitted causing electricity
• When a nuclear fission reaction occurs, the protons emitted can strike other nuclei in the sample, and cause them to split
• When a nuclear fission reaction occurs, the neutrons emitted can strike other nuclei in the sample, and cause them to split
• When a nuclear fission reaction occurs, the electrons emitted can strike other nuclei in the sample, and cause them to split

Multiple Choice

Solve this equation for beta decay.
₆¹⁴C = ___ + _-1⁰e

• ₄¹⁰Be
• ₇¹⁴N
• ₂¹⁰He
• ₆¹³C

Multiple Choice

After 22,800 years, approximately what percentage of the original carbon-14 remains?

• 15%

• 12.5%

• 6.25%

• 3.125%

Multiple Choice

You have 100 grams of radioactive C-14. The half life of C-14 is 5730 years.

How many grams are left after 2 half lives?

• 100 grams

• 25 grams

• 50 grams

• 14 grams

Multiple Choice

If 10 mg of iodine 131 is given to a patient, how much is left after 24 days? The half-life of iodine-131 is 8 days.

• 1.25mg
• 1.25g
• 10g
• 10mg

Multiple Choice

Barium-122 has a half-life of 2 minutes. A fresh sample weighing 80 g was obtained. If it takes 10 minutes to set up an experiment using barium-122, how much barium-122 will be left when the experiment begins?

• 0.25g
• 2.5g
• 25g
• 80g