A step-by-step description of chemical experiments for kids. Several additional sections, such as FAQ and troubleshooting, scientific description of what happens, Interesting facts, etc. All text should be clear for 12 y.o. kids. Samples texts:
Every metal possesses a set of unique chemical and physical properties, such as a specific structure for its crystals. Crystals of tin are strong and relatively elastic, and the speed of crystal growth in one direction is faster than the speed of crystal growth in other directions, which results in the appearance of long needles.
When we dilute the salt solution, we increase its volume, but because the overall number of salt molecules remains the same the solution becomes less concentrated. This decrease in tin chloride concentration results in longer tin needles, which makes the hedgehog look awesome, but the needles grow much slower. If the solution is diluted more than four-fold, the hedgehog forms much too slowly.
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