1. Dancing Raisins (Buoyancy & Gas Formation)
Materials: Clear glass, soda (e.g., Sprite or club soda), raisins
How it works:
Fill a glass with soda.
Drop raisins in and watch them "dance" as bubbles (CO₂) attach to them, making them float, then sink when the bubbles pop.
Lesson: Density, gas bubbles, buoyancy.
2. Homemade Lava Lamp (Density & Chemical Reactions)
Materials: Clear bottle, water, vegetable oil, food coloring, Alka-Seltzer tablets
How it works:
Fill the bottle ¼ with water, then ¾ with oil (they won’t mix due to density differences).
Add food coloring (it will sink through oil and mix with water).
Drop in an Alka-Seltzer tablet—bubbles will carry colored water blobs up and down.
Lesson: Density, immiscible liquids, gas release.
3. Invisible Ink (Acid-Base Reaction)
Materials: Lemon juice, cotton swab, paper, heat source (lamp or iron)
How it works:
Dip a swab in lemon juice and write on paper.
Let it dry—the writing becomes invisible.
Heat the paper to reveal the message (lemon juice oxidizes and turns brown faster than paper).
Lesson: Oxidation, acids, secret messages!
4. Rainbow Milk (Surface Tension & Chemistry)
Materials: Milk, food coloring, dish soap, cotton swab
How it works:
Pour milk in a dish and add drops of different food coloring.
Dip a cotton swab in dish soap and touch the milk—colors explode outward!
Lesson: Surface tension, soap molecules breaking fat bonds in milk.
5. Baking Soda & Vinegar Volcano (Chemical Reaction)
Materials: Baking soda, vinegar, dish soap, food coloring, container
How it works:
Mix baking soda with a bit of dish soap and red food coloring in a small container.
Pour vinegar in—foam erupts like a volcano!
Lesson: Acid-base reactions, CO₂ gas production.
6. DIY Slime (Polymer Science)
Materials: White glue, borax (or contact lens solution + baking soda), water, food coloring
How it works:
Mix glue with water and food coloring.
Add borax solution (or contact lens solution + baking soda) to form slime.
Lesson: Polymers, non-Newtonian fluids.
7. Ice & Salt Experiment (Melting Point & Temperature)
Materials: Ice cubes, salt, string
How it works:
Place an ice cube on a plate.
Lay a string on top and sprinkle salt—wait a minute, then lift the string to pick up the ice!
Lesson: Salt lowers ice’s melting point, then water refreezes around the string.
8. Balloon Rocket (Newton’s Third Law)
Materials: Balloon, string, straw, tape
How it works:
Thread a string through a straw and tie it between two chairs.
Blow up a balloon, tape it to the straw (no knot!), then release—it zooms!
Lesson: Action-reaction forces, thrust.
9. Walking Water (Capillary Action)
Materials: 3 cups, water, food coloring, paper towels
How it works:
Fill two outer cups with colored water, leave the middle empty.
Fold paper towels from outer cups into the middle—water "walks" and mixes!
Lesson: Capillary action, color mixing.
10. Egg in a Bottle (Air Pressure)
Materials: Hard-boiled egg, glass bottle with a narrow neck, matches/lighter
How it works:
Light a match, drop it in the bottle, then place the egg on top.
The egg gets sucked in as the fire consumes oxygen, lowering air pressure inside.
Lesson: Air pressure, combustion (requires adult help!).
Bonus: DIY Stethoscope (Sound Waves)
Materials: Funnel, plastic tubing, balloon
How it works:
Attach a funnel to tubing and stretch a balloon over the wide end.
Place the funnel on a heartbeat and listen through the tube!
Lesson: Sound vibrations, human biology.
These experiments encourage curiosity, critical thinking, and hands-on learning. Always supervise kids, especially with fire or chemicals. Have fun exploring science! 🚀🔬
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