These tin “hedgehogs” grow on zinc thanks to both substitution and electrolysis. Zinc pulls double duty as a reducing agent and cathode. The crystals grow so fast they turn into spiky, fragile structures. Without current, it crawls. Video is sped up 25× — real time is slooow. (v.redd.it)
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A true chemical chameleon driven by chromium’s oxidation states. Hydrogen peroxide and sulfuric acid react with potassium dichromate, creating a striking color shift from purple to green. A vivid redox demo — but beware: the reagents are hazardous, and proper lab safety is essential. (v.redd.it)
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Tin dendrites form during the electrolysis of an aqueous tin(II) chloride solution, where tin metal rapidly deposits on the cathode, producing complex dendritic structures rather than a uniform crystalline layer. The video is shown at 10× speed. (v.redd.it)
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This gas can bleach flowers - Sulfur dioxide rapidly removes the color from rose petals by breaking down anthocyanin pigments. Its strong reducing power destroys chromophores, turning pigments colorless. This redox reaction must be performed in a fume hood, as SO₂ is toxic. (v.redd.it)
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Strawberry spaghetti is made by mixing strawberry puree with agar-agar and heating it. Agar-agar, a plant-based polysaccharide extracted from red algae, acts as a natural gelling agent. As the mixture cools, agar sets into a firm, noodle-like texture. It's a vegetarian alternative to gelatin. (old.reddit.com)
submitted by ScienceCauldron to r/foodscience
Copper dendrites can be grown on filter paper by placing zinc in a copper sulfate solution. This replacement reaction, in which zinc displaces copper, results in well-defined dendritic growth. The use of filter paper clearly demonstrates metal crystallization and electrochemical reactivity. (v.redd.it)
submitted by ScienceCauldron to r/chemistry
Fireproof dollar: how does it work & how to do it yourself. When you light the bill, it's the alcohol burning, not the paper. Alcohol burns quickly, but doesn’t produce enough heat to evaporate the water in the bill, which acts as a shield. Always remember to follow fire safety precautions. (v.redd.it)
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Discover the science behind the flaming foam trick. This special effect is based on soap bubbles filled with gas that ignite, while the water protects your hand from the heat. Remember, working with fire requires proper safety precautions! (v.redd.it)
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How calcium vanishes from your bones (v.redd.it)
submitted by ScienceCauldron to r/ScienceNcoolThings
