Topic
Chemistry & materials
Mixing, states, crystals, fire — why stuff changes.
📖 storybook Why does ice float?
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If you dissolve a whole sugar cube in water, does the water weigh more?
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Why does hot cocoa mix in fast but cold milk leaves clumps?
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Can you keep stirring sugar into water forever?
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Why does a metal spoon feel colder than a wooden one sitting right next to it?
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Why does sugar vanish in water but sand just sits there?
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Why does an iron nail turn orange and crumbly but a gold ring never does?
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Why does lemon juice fizz on baking soda but water just sits there?
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📖 storybook Why does soap wash off greasy hands but water alone just rolls off the grease?
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📖 storybook Why does a candle flame die under a glass but burn forever in the open?
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📖 storybook Why do crystals have flat sides?
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Why does oil and vinegar split apart no matter how hard you shake them?
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Why does white glue dry hard but stay gooey in the bottle?
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Why does red cabbage juice turn pink in lemon and green in soap?
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Why does a cut apple turn brown — and can you stop it?
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Why does freezer ice turn out cloudy but fancy ice is crystal clear?
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Why does salt melt the ice on a sidewalk but sugar barely helps?
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Why does hand sanitizer feel freezing cold but water doesn't?
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📖 storybook Can stacked liquids catch an object that sinks in water?
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📖 storybook How do temperature and surface area work together to change fizz speed?
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📖 storybook Why can a safe sealed process become warmer or cooler?
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📖 storybook How can soap change the pull across a water surface?
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📖 storybook Why can cornstarch goo feel solid and liquid?
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📖 storybook What happens to a birthday candle's smoke right after you blow it out?
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