Nuclear Chemistry Assessment

1. Aria is studying about Actinium-226 in her chemistry class. She learned that Actinium-226 has a half-life of 29 hours. David and Samuel, her classmates, conducted an experiment where they started with an initial amount of 200 g of Actinium-226 and let it disintegrate over a period of 87 hours. They asked Aria, how many grams of actinium-226 will remain after the experiment?

2. Anika was studying about radioactive elements and she came across Fluorine. She learned that Fluorine has a half-life of 2 days. If she started observing a sample of Fluorine that was at 100% purity, what percentage of the Fluorine would remain after 10 days?

Tags

NGSS.HS-PS1-8

3. Mason found an ancient artifact made of Carbon-14. He learned that the half-life of Carbon-14 is 5700 years. If the artifact originally weighed 64 g, Michael and Isla are curious to know how many years would pass before the artifact's weight is reduced to 1 gram?

Aria was studying about radioactive decay in her science class. She learned that strontium-90 has a half-life of 14.8 days. If Benjamin had a sample of 30 g of strontium-90, Noah asked him how many half-lives it would take for the sample to decay to 7.5 g. What should be Benjamin's answer?

• 1 half-life

• 2 half-lives

• 3 half-lives

• 4 half-lives

Tags

NGSS.HS-PS1-8

Aiden, Anika, and Noah are studying chemistry. They come across the term "carbon-12" in their textbook. They wonder what the "12" in carbon-12 represents. Can you help them?

• Atomic number

• Mass number

• Neutron number

• Formula mass

Tags

NGSS.HS-PS1-8

Aria, Nora, and Ava are studying radioactive decay for their science project. They learned that there are 3 types of processes in radioactive decay. They want to know which type is the most dangerous for humans. Can you help them? 

• Alpha 

• Beta 

• Gamma 

Tags

NGSS.HS-PS1-8

Avery, Kai, and Benjamin are studying radioactive isotopes for their science project. They are trying to understand the concept of Half-life. In this context, what does Half-life mean?

• The amount of time it takes for some of the nuclei in a sample of the isotope they are studying to decay

• The amount of time it takes for half the electrons in a sample of the isotope they are studying to decay

• The amount of time it takes for half the nuclei in a sample of the isotope they are studying to decay

• The amount of time it takes to double the nuclei in a sample of the isotope they are studying to decay

Tags

NGSS.HS-PS1-8

Emma, Oliver, and James are working in a lab with a fresh sample of Barium-122, which has a half-life of 5 minutes and weighs 80g. They need 10 minutes to set up their experiment. How much Barium-122 will be left when they start their experiment?

• 0.25g

• 2.0g

• 20g

• 40g

Tags

NGSS.HS-PS1-8

Sophia, Isla, and Anika are studying chemistry and they come across the term 'isotope'. Which of the following scenarios best describes an isotope?

• Sophia says it's atoms of the same element with the same mass

• Isla thinks it's atoms of different elements with the same mass

• Anika believes it's atoms of the same element with a different number of neutrons

• They all agree that it's atoms of different elements with different number of neutrons

Tags

NGSS.HS-PS1-8

Noah, Avery, and Grace are studying nuclear physics. They learned that the half-life of strontium-90, a radioactive isotope used in cancer treatment, is 25 years. If a hospital had an initial amount of 4.0 g of strontium-90, how much of it will remain after 100 years?

• 3.0g

• 0.25mg

• 0.3g

• 0.25g

Tags

NGSS.HS-PS1-8