Nuclear Chemistry Quiz 2

What is the definition of half-life in nuclear chemistry?

• The time required for half of the radioactive atoms in a sample to decay
• The time required for the sample to become non-radioactive
• The time required for all of the radioactive atoms in a sample to decay
• The time required for a quarter of the radioactive atoms in a sample to decay

What is the mass remaining for a 10 gram sample after going through one half-life cycle?

• 15 grams
• 10 grams
• 5 grams
• 2.5 grams

What isotope is used in carbon dating?

• Carbon-14
• Oxygen-16
• Hydrogen-1
• Uranium-235

The half-life of a certain isotope is 5 days. If you start with 60 grams of this isotope, how much will remain after 15 days?

• 7.5 grams
• 20 grams
• 45 grams
• 30 grams

If the half-life of a radioactive element is 50 years, how much of the substance will remain after 150 years?

• 1/8

• 3/4

• 1/2

• 1/4

What isotope is used in nuclear power plants?

• Oxygen-16
• Carbon-14
• Hydrogen-1
• Uranium-235

Nuclear reactors rely on which nuclear process to generate energy?

• Solar power
• Chemical reaction
• Nuclear fusion
• Nuclear fission

Nuclear chemistry involves the change in the ______

• Electrons

• Physics

• Mitochondria

• Nucleus