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Why does ice float on the surface of oceans instead of sinking to the bottom?
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3. Water
Properties of Water- Density
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Which of the following occurs because molecules of water are farther apart in ice than in liquid water?
A
Ice is denser than liquid water.
B
Ice expands when it melts.
C
Ice vaporizes before liquid water does.
D
Ice floats.
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Understand the concept of density: Density is defined as mass per unit volume. When molecules are packed closely together, the substance is denser.
Recognize the structure of water molecules in ice: In ice, water molecules form a crystalline structure due to hydrogen bonding, which spaces them farther apart compared to liquid water.
Compare the density of ice and liquid water: Because the molecules in ice are farther apart, ice has a lower density than liquid water.
Relate density to buoyancy: Objects with lower density than the liquid they are placed in will float. Since ice is less dense than liquid water, it floats.
Conclude the relationship between molecular structure and physical properties: The arrangement of water molecules in ice leads to its lower density, causing it to float on liquid water.
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