Middle School Science Lessons

Objectives:

Materials – per 2 students

• Student Handout – Candle Observations (pdf)
• CK12 – optional reading assignment on the structure of a flame
• votive candle
• small beaker
• large beaker
• ruler
• matches & beaker with water for spent matches
  • I light the candles for the students in this age group (6th)

Procedures

1. Discuss how candles work and the fire triangle (link)
2. Discuss combustion and the chemical reactions that takes place when a candle burns
3. Explain the lab procedures and remind students of safety protocols
4. Students will record qualitative and quantitative observations of an unlit candle (5 minutes), burning candle (10 minutes), and a covered burning candle until it goes out and the wax hardens (5 minutes)
   • all students will place the larger beaker over the candle at the same time and watch as the candle goes out
5. Share observations and discuss

• Additional resources:
  • Naked Scientist – water vapor and candles
  • Candle Science – how do candles burn?