Half-Life Models & Nuclear Equations — Drills · Grade 11 Science
Chapter: Redox, Cells & Nuclear ChemistryWhat these drills covers
By the end of Half-Life Models & Nuclear Equations you should be able to:
- I can calculate remaining parent amount from a statistical half-life model.
- I can identify daughter counts and state isotope-dating assumptions.
2 questions, numeric and written answer, each with a worked explanation.
Vocabulary used: activity, daughter nucleus, decay constant.
Problem 1
80 g parent undergoes two half-lives. Find parent mass.
Hints
Write the relationship first; substitute with consistent units.
Answer and explanation
20 g
80/4=20.
Problem 2
Does all parent disappear after two half-lives?
Answer and explanation
No. One-quarter remains on average in a large population.
Response criteria
- State a scientifically accurate conclusion.
- Show the calculation or mechanism that supports it.
- Include units, conditions, or limits where relevant.