which of the following statement is correct?
A. Iron with a density if 7.9h/cm³, will sink in water but float in mercury with a density of 13.57g/cm³.
B. Density of seed is not a good indicator of their quality. Bad seeds tend to be denser that good one.
C. Ballon float because they are filled with hydrogen, a gas which is less dense than air.
D. Oil floats because it is denser than water
A. Iron with a density if 7.9h/cm³, will sink in water but float in mercury with a density of 13.57g/cm³.
B. Density of seed is not a good indicator of their quality. Bad seeds tend to be denser that good one.
C. Ballon float because they are filled with hydrogen, a gas which is less dense than air.
D. Oil floats because it is denser than water
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Answer:
I think A,C,and D
Explanation:
A is correct because in principles of density,a more dense objects than water will tend to sink.The density of water is about 1 g/cm^3,and iron has a density of 7.9 g/cm^3.Since iron's density is higher than water,it will sink.But in the mercury,mercury's density is higher than that of iron so iron will tend to float.
In C,hydrogen gas has a very small density compared to air,so hydrogen will float through the air.However,most balloons are filled with helium,mainly because hydrogen is a very reactive gas in contact with air.
In D,oil floats in water with the same principle,mainly because the molecules of oil occupies more space,decreasing its volume and its density as well.Additionally,oil is hydrophobic or nonpolar in water,which preventd them from having contact with water.