Safety boundary
Use coin/dice half-life models, simulations, and trusted lifecycle datasets only. Do not use radioactive sources or hazardous materials.
Explicit chemistry instruction
Chemical reactions rearrange electrons and bonds while preserving nuclei.
Nuclear changes alter the nucleus and can change one element into another.
Energy scales and products differ greatly, so chemical and nuclear models should not be mixed.
Vocabulary: nuclear reaction; chemical reaction; nucleus; transmutation; isotope.
Worked example
Burning carbon rearranges electrons and bonds; beta decay changes nuclear composition and can change elemental identity.
Guided question
Why can nuclear decay change the element while a chemical reaction cannot?
Independent work
- Classify six processes as chemical or nuclear.
- Identify what changes in each.
- State one model boundary.
Misconception check
Radioactivity is not a chemical bonding process.
Formative check
What part of the atom changes in a nuclear reaction?
Reveal response
The nucleus.
Mentor evidence conference
Ask Archaemenes to audit mechanism, quantitative evidence, tradeoffs, and uncertainty.
Teacher guidance
Foundation: Use a comparison table.
Core: Distinguish chemical/nuclear evidence.
Extended: Compare energy-scale and identity changes.