Something that doesn't make sense to me:
Whys do liquids expand when they solidify?
Why it doesn't make sense to me is that molecules in solids are tightly packed together while molecules in liquids are more free. So, theoretically, liquids should take up more space than solids right?
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Explanation:
Because of the shape of the water molecule and the angles that it forms when it bonds, the solid form of water actually ends up taking up more space than liquid.
The molecules are most tightly packed in solid state because of the strong intermolecular forces of attraction.
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