ANSWERS: 2
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No. Water, by definition, has a density of 1. Anything higher will not float in it. Your question didn't state what liquid you're trying to float the substance in, but I'm assuming it's water.
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density is only part of the issue, to float on water you need to displace more water than the weight of your vessel. A concrete ship will float if it moves more water than it weighs, but a 1ftx1ft concrete block won't float
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