Lesson Overview

 50 Minutes

 1, 2, 5, 9

 4th - 8th Grade

 State Standards:
Science Standards Scientific Inquiry: 1.3-7.3; Engineering Design: 1.4-7.4

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Materials List

  • 3 – 125 ml Erlenmeyer flasks
  • water
  • hot plate or thermos
  • 1 1/2 tsp flour
  • 1 1/2 tsp sugar
  • 3 tsp yeast
  • 3 or more balloons

Yeast Blow Up!

Categories: Agriculture , Chemistry , Math & Measurements

Yeast Blow up! Is yeast alive? What does yeast need to live? How does yeast help bread rise?

INSTRUCTIONS

  • In three 125 ml Erlenmeyer flasks place 1/2 teaspoon of flour
  • 1/2 teaspoon sugar and 1 teaspoon yeast.
  • In the first flask add cold tap water to the 100 ml mark (60 degrees fahrenheit, 15 degrees celsius.)
  • In the second flask add warm water to the 100 ml mark (100 degrees fahrenheit, 38 degrees celcius.)
  • In the third flask add boiling water to the 100 ml mark (212 degrees fahrenheit, 100 degrees celsius.)
  • Swirl the flasks.
  • Place a balloon over each flask. Three different colors helps for identification

For full instructions, please download our PDF

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