BIOCHEMISTRY
PROPERTIES OF WATER
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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As water freezes, the space between molecules expand, decreasing its density
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As water freezes, it takes up more oxygen from the air, increasing its density
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As water freezes, it takes up more hydrogen, increasing its density
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Detailed explanation-1: -As water freezes it expands. So, ice has more volume (it takes up more space, but has less density) than water. Share with the children that this is a very special property of water.
Detailed explanation-2: -Water expands when it freezes making it less dense than the water from which it freezes. In fact, its volume is a little over 9% greater (or density ca. 9% lower) than in the liquid state. For this reason, ice floats on the water (like an ice cube in a glass of water).
Detailed explanation-3: -The extra hydrogen bonds that occur when water freezes increase the space between molecules, causing a decrease in overall density.
Detailed explanation-4: -What’s so special about ice that causes it to float? Believe it or not, ice is actually about 9% less dense than water. Since the water is heavier, it displaces the lighter ice, causing the ice to float to the top.
Detailed explanation-5: -When frozen, water molecules take a more defined shape and arrange themselves in six-sided crystalline structures. The crystalline arrangement is less dense than that of the molecules in liquid form which makes the ice less dense than the liquid water. When water freezes, the volume expands by approximately 9%.