How do objects made of many different molecules (eg. an Apple) stay together and not fall apart into piles of powders and liquids?
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The molecules of the different substances bond. Even simple things like salt water stay together – the salt molecules dissolve into the water molecules, they don’t separate out (unless there’s too much salt). The different types of stuff stay together the same way the same stuff stays together – the molecular bonds keep it together. And in something like an apple, there are things like cell walls and other barriers that help keep things in place.
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