Which of these has the greatest density? a. an iceberg b. a gallon of water c. an aluminum can d. a small piece of lead

So with bigger space occupied a bigger density. In this case A) an iceberg made of ice has a bigger density. While lead would be the substance with a bigger density per gram.

Explanation:

Density is the level of compactness a specific substance has. In other words space, a specific substant occupies. Some substances have a bigger density than others. Because all off them have different chemical and physical compositions. The formula to calculate it is:

Density = mass of the substance/ volume

From this group

lead has a density of 11.342 gram per cubic centimeter

Ice has a density of 0.92 gram per cubic meter

Aluminum has a density of 2.7 gram per cubic meter

Water has a density of 1 gram per cubic meter.

So with bigger space occupied a bigger density. In this case, ice has a bigger density.

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the best answer is d because the strong cohesion is caused by the ability of water molecules to undergo hydrogen bonding.

a is incorrect because when water solidifies, it becomes   ice, which expands and occupies a bigger volume for the same mass of water in its liquid state.

b is incorrect because water has high surface tension. besides bonding to itself it hydrogen bonds to other molecules at the top decreasing possibility for breaking of attractive forces.

c is incorrect because the water molecule has oxygen which is highly electronegative and so pulls the electron pair towards itself creating a dipole moment, making the molecule polar.

e is incorrect because water has strong adhesion, ability to stick to other molecules such as glass because of this molecules having stronger hydrogen bonding than water.