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Why are water molecules less dense in ice than in water? Specific heat Van der Waals forces Hydrogen bonding Ice floats Which

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Hydrogen bonding

Explanation: The density of water is decreased when it is melt because the orientation of hydrogen bonding which push them further apart. Water molecules are more efficiently packed in liquid than in ice. In ice, each water molecule is joined by four other by hydrogen bonds while in water, each water molecule is joined to 5 or more other by hydrogen bonds. This lighter density helps the ice to float. Vander wall forces is the weak electrostatic attraction between neutral molecules that doesn't involved in bonding between water molecules. Specific heat doesn't involved in water density.

Cohesion

Surface tension

Capillary action

Adhesion

Explanation: Water is the oxide of hydrogen where two hydrogen atoms are joined to oxygen atom and has several unique properties like cohesion, adhesion, surface tension, capilarity etc. Cohesion is the attraction between water molecules whereas adhesion is the attraction of water molecules to a solid phase like cell wall. Surface tension results due to force of attraction existing between the water molecules and the open boundary surface. This unequal attraction of water molecules tends to minimize surface area and create surface tension. These adhesion, cohesion and surface tension capillarity action of water molecules and helps upward movement of water through narrow tube.

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