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Warming up with energy

Warming up with energy. Lesson objectives. * know the difference between temperature and heat * Find out through experiment; the power of a bunsen burner. Warming up with energy. Experiment to compare boiling times for different amounts of water. For 50 cm 3 water.

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Warming up with energy

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  1. Warming up with energy Lesson objectives * know the difference between temperature and heat * Find out through experiment; the power of a bunsen burner

  2. Warming up with energy

  3. Experiment to compare boiling times for different amounts of water For 50 cm3 water Time / min Temp / C 0.0 18 1.0 50 2.0 80 3.0 92 4.0 100 Prediction: ……………………………………………………….. thermometer 50cm3 water HEAT ……………………………………………………….. Conclusion:

  4. Temp / C 100 80 60 40 20 TIME / mins 0 8 4 2 6

  5. For 50 cm3 water Time / min Temp / C 0.0 18 1.0 50 2.0 80 3.0 92 4.0 100 Temp / C 100 80 60 40 20 TIME / mins 0 8 4 2 6

  6. Temp / C 100 80 For 50 cm3 water 60 Time / min Temp / C 0.0 18 40 1.0 50 2.0 80 3.0 92 20 4.0 100 TIME / mins 0 8 4 2 6

  7. Temp / C 100 80 Gradient = Δ temp Δ time 60 40 20 TIME / mins 0 8 4 2 6

  8. Temp / C 100 80 Gradient = Δ temp = Δ T Δ time Δ t 60 40 20 TIME / mins 0 8 4 2 6

  9. Temp / C 100 80 Gradient = Δ temp = Δ T Δ time Δ t = (68 -33) C 60 sec = 60 40 20 TIME / mins 0 8 4 2 6

  10. Temp / C 100 80 Gradient = Δ temp = Δ T Δ time Δ t = (68 -33) C 60 sec = 0.58 C / sec 60 40 20 TIME / mins 0 8 4 2 6

  11. Temp / C 100 Bunsen power: (assuming no energy loss) Δ U = m c Δ T Δ t Δ t = 80 Gradient = Δ temp = Δ T Δ time Δ t = (68 -33) C 60 sec = 0.58 C / sec 60 40 20 TIME / mins 0 8 4 2 6

  12. Temp / C 100 Bunsen power: (assuming no energy loss) Δ U = m c Δ T Δ t Δ t = 0.05 x 4200 x 0.58 = 80 Gradient = Δ temp = Δ T Δ time Δ t = (68 -33) C 60 sec = 0.58 C / sec 60 40 20 TIME / mins 0 8 4 2 6

  13. Temp / C 100 Bunsen power: (assuming no energy loss) Δ U = m c Δ T Δ t Δ t = 0.05 x 4200 x 0.58 = 121 W 80 Gradient = Δ temp = Δ T Δ time Δ t = (68 -33) C 60 sec = 0.58 C / sec 60 40 20 TIME / mins 0 8 4 2 6

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