The density of water is 1.00 g/mL. Carbon tetrachloride is insoluble in water. Would carbon tetrachloride float on water or sink beneath water when they are combined?
Carbon tetrachloride would sink beneath water.
Density of carbon tetrachloride at ambient conditions is approximately 1.5 g/ml, so for a given volume carbon tetrachloride has a higher mass than water. So when combined the carbon tetrachloride would sink below the water.