Natural Sciences · Intermediate · Lesson 7 of 7
Sunscreen & UV
When light breaks bonds
An interactive lesson with 4 steps, about 5 minutes: you predict, drag and solve, with instant feedback on every answer. It runs in your browser and needs JavaScript.
What you’ll learn
- λmax to break a bond = 119,600 / (bond energy in kJ/mol) nm.
- UVB and UVA damage skin; sunscreens absorb both.
- Good absorbers turn UV into harmless heat.
Steps
- Photons that break bonds
- Breaking O–H
- Formulate a sunscreen
- Why molecules survive