Lemon Marvels: 3 Surprising Experiments You Can Do At Home
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- Äas pĆidĂĄn 10. 09. 2024
- Video Submission for Fe STEM Teacher Challenge 2023
www.science.ed...
In this video, I share three simple yet eye-catching demonstrations that teachers can use to teach different concepts in Chemistry.
đ DEMONSTRATION 1: FLAMMABLE FRUIT đ
You can use this to illustrate the flammable properties of limonene, a natural compound found abundantly in lemon peels.
CONNECT:
Lower Secondary Science: Limonene as a volatile compound and linking to the concept of diffusion.
Upper Secondary Chemistry: Hydrocarbons, complete/incomplete combustion.
Post-secondary: Flash point
EXTEND:
Would limonene be a good option in the search for a sustainable fuel?
Based on its structure, what other chemical properties would limonene have?
CHALLENGE:
Investigate whether this experiment would work using the peels of other citrus fruits.
đ DEMONSTRATION 2: LEMON VS. BALLOON đ
Witness the incredible "power" of a lemon as we squeeze its peel towards a balloon, causing it to burst.
CONNECT:
Upper Secondary Chemistry: Solubility of hydrocarbons
Post-secondary: Polar and non-polar substances
EXTEND:
Would limonene have a similar effect on other materials such as a Styrofoam cup?
Why is it important that certain substances be stored in containers made of an appropriate material?
CHALLENGE:
Investigate whether other organic compounds or essential oils can burst a ballon.
TROUBLESHOOTING:
If the balloon does not burst, ensure that the limonene vapours come into contact with a concentrated spot on the balloon. Also make sure that the balloon is blown up fully.
đ DEMONSTRATION 3: INVISIBLE INK đ
Ever wondered how lemons could have a secret talent for erasing ink? In this experiment, we demonstrate the magical effect of using citric acid in lemon juice to erase highlighter ink.
CONNECT:
Lower/Upper Secondary Chemistry: Acids, Bases, pH, Indicators
Post-secondary: pKa, structural changes of limonene, delocalisation and conjugation, florescence
EXTEND:
What uses does pyranine have besides a highlighter ink?
Use ammonia vapours to develop the colour instead.
CHALLENGE:
Develop your own erasable/colour-changing stationery products by applying this concept.
TROUBLESHOOTING:
If the yellow colour does not reappear after applying sodium carbonate, your ink mixture is too diluted. Try using more ink extract from the highlighter, and less lemon juice.
đšđ»âđŹWhat other concepts can you demonstrate using a lemon?
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âš Always question, always wonder!
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Image on Pyranine:
chemrxiv.org/e...