Relief Teaching Ideas

Sharing ideas to help make relief teaching fun, enjoyable, and meaningful.


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Super Lemon Suds!

Science fun, with a little cleaning thrown in! 🙂

This simple science idea, showing the chemical reaction that occurs when you mix citric acid with bicarb soda, has the added fun of bubbles!

Materials:
-Clear container or cup
-Measuring spoon
– Spoon or stirrer (I used a chopstick!)
– Liquid dish soap
– Bicarb soda
– Lemon cut in half

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Method:
1. Put about 1 tsp of bicarb soda in cup.
2. Stir in about 1 tsp of dish soap.

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3. Squeeze lemon juice into cup & give it a stir.
4. Watch the bubbles form & rise up!

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Explanation:
When you mix citric acid (the lemon juice) with bicarb soda a chemical reaction occurs, creating carbon dioxide gas & water. The gas is seen as bubbles but when you add the dish soap it creates even more bubbles.

Experiment:
Students could test out what happens with different brands of dish soap, different amounts & ratios of the ingredients or what happens when you leave one of the ingredients out.
Students could also conduct an experiment on the cleaning power of the lemon/bicarb mixture.
_____________________
After we finished making A LOT of bubbles we used the lemon scented mixture to clean the kitchen benches & sink.
If you did this experiment in the classroom the kids could wipe down their desks at the end of the lesson & it would leave the room smelling lemon fresh. Lemon is a safe, natural antibacterial cleaner!


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Black Pepper Science Trick

Here’s another easy but impressive science lesson that’s been around for a long time. Easy to replicate both at home & in the classroom.

All you need is:
Black Pepper
Bowl or plate
Water
Dish Detergent

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Method:
– Pour water into a plate or bowl.
-Shake some pepper onto the water.

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-Dip your finger into the pepper and water. Nothing happens.

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– Dip a different finger in (secretly dip it into some dish detergent before doing the trick).
-Watch as the pepper rushes to the edges of the bowl.

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Explanation:
When you add detergent to water the surface tension of the water is lowered. Water usually beads up (you can show this to students by dropping some water on a coin) but when the surface tension is lowered, the water wants to spread out. As the water spreads out/flattens in the bowl, the pepper that is floating on top of the water is carried to the outer edge of the bowl.