- 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 Method: 1. Put about 1 tsp of bicarb soda in cup. 2. Stir in about 1 tsp of dish soap. 3. Squeeze lemon juice into cup & give it a stir. 4. Watch the bubbles form & rise up! 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
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 Method: - Pour water into a plate or bowl. -Shake some pepper onto the water. -Dip your finger into the pepper and water. Nothing happens. - 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. 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
This science trick is so simple, but so much fun. It's also easy for students to replicate at home. Equipment: -Two empty 375ml cans -Approx 100ml of water Method: -Secretly pour about 100mls of water into one can. -Have a student try to balance the other empty can tilted on its bottom rim. It is impossible. -Then amaze them, by easily balancing your ‘magic’ can on its bottom rim (they don’t need to know it has water in it). Explanation: It works because the water adds weight to the bottom of the can, changing its centre of gravity and allowing it to balance in otherwise impossible ways.