Chlorine The Bacteria Killer: Difference between revisions
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== Materials == | == Materials == | ||
* | * 6 Test Tubes | ||
* Test Tube Stand | * Test Tube Stand | ||
* Balloons | * Balloons | ||
| Line 29: | Line 29: | ||
== Demonstration == | == Demonstration == | ||
# Prepare the test tubes: Put a small amount of yeast in each test tube along with some sugar in each. In three of the test tubes, fill them 1/4 of the way with bleach. Add water into each test tube, filling them about 2/3 of the way, and put a balloon on each test tube. Set them all in the beaker, fill the beaker 2/3 with water, and set it on the hot plate on a low setting. | |||
# | # As students come to visit your table and as the test tubes warm, the yeast will wake up and start to consume the sugar, releasing CO<sub>2</sub> and filling the balloons. Once a few balloons are noticeably filled with air, set all the test tubes in the test tube stand. | ||
# | # After explaining that there is yeast in each of the test tubes, ask students for ideas on why some of them aren't producing CO<sub>2</sub>. Discuss and explain. | ||
# | |||
== Why This Works == | == Why This Works == | ||
'''''COMING SOON''''' | '''''COMING SOON''''' | ||
Revision as of 19:52, 12 July 2016
| Biology, Chemistry: | Anti-Bacterial Cleaners |
| Grade Range: | Elementary School, Middle School |
| Format: | Hands-on |
This is your basic yeast demonstration with an addition of bleach. This demonstration is simple to set up and easy for kids to understand, but you will want towels in case there is a spill.
Materials
- 6 Test Tubes
- Test Tube Stand
- Balloons
- Yeast
- Sugar
- Water
- Hot Plate
- 600mL Beaker
- Bleach
Safety Precautions
Please read the General Safety Precautions section of the Demonstration Safety page before performing this demonstration.
Demonstration
- Prepare the test tubes: Put a small amount of yeast in each test tube along with some sugar in each. In three of the test tubes, fill them 1/4 of the way with bleach. Add water into each test tube, filling them about 2/3 of the way, and put a balloon on each test tube. Set them all in the beaker, fill the beaker 2/3 with water, and set it on the hot plate on a low setting.
- As students come to visit your table and as the test tubes warm, the yeast will wake up and start to consume the sugar, releasing CO2 and filling the balloons. Once a few balloons are noticeably filled with air, set all the test tubes in the test tube stand.
- After explaining that there is yeast in each of the test tubes, ask students for ideas on why some of them aren't producing CO2. Discuss and explain.
Why This Works
COMING SOON
Additional Information
- This demonstration is shown another way in the Life on Mars demonstration.