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What is the main difference between ice and water?

Answer and explanation

Correct answer: Physical state

The governing concept is change of physical state without change in chemical identity. Ice and liquid water are both H₂O, so their molecules have the same composition and the same chemical identity. The difference is that ice is the solid state, in which molecules occupy a more fixed arrangement, whereas water is the liquid state, in which molecules can move past one another. Heating or cooling can bring about this reversible change of state without changing H₂O into a different substance. Therefore, option B, physical state, is correct. Colour, element, and atomic number do not describe the main difference: water and ice are not different elements, and a change from solid to liquid does not alter atomic numbers.

Related tags

ChemistryIce And WaterPhysical ChangeStates Of MatterNature Of MatterSome Basic Concepts Of ChemistryClass 11 Mcq

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