3. Water

Properties of Water- Density

Density

Density of Liquid Water vs. Solid Ice

 Although it is feared that sea ice around Alaska and northern Canada may be greatly reduced by atmospheric warming, the high specific heat of water has so far buffered these sea ice communities from significant impacts. 

 No. The average air temperature in Alaska and northern Canada has increased 1.4&#176;C since 1961, which, despite water's high specific heat, has led to a significant reduction in the Arctic sea ice. 

 An increase in water temperature due to global warming will cause the sea ice formed in the Arctic to be denser and less buoyant. 

 No. An increase in ocean temperature will not affect the relationship between water density and temperature. 

 Although a significant increase of air temperature has occurred in the Arctic over the past 50 years, the specific heat of water has thus far buffered against any significant increases in the Arctic ocean temperatures. 

 No. The increase in Arctic air temperature over the past 50 years has apparently overwhelmed the capacity of seawater to absorb heat without an appreciable change in Arctic sea temperature. 

 Ice floats because it is less dense than liquid water; floating ice insulates water below and provides a habitat for some species. The significant increase in Arctic air temperature over the past 50 years is causing a reduction in sea ice, compromising these beneficial effects of sea ice. 

Consider the emergent properties of water that relate to heat and density.

Which of the following accurately relates the emergent properties of water to the effects of global warming in the Arctic?

Importance of water for life | Chemistry of life | AP Biology | Khan Academy

Properties of Water

Water - Liquid Awesome: Crash Course Biology #2

Why does ice float in water? - George Zaidan and Charles Morton

 No. If the molecules are farther apart, the ice is less dense than liquid water. 

 No. Water expands when it freezes into ice because the molecules are farther apart. 

 Ice vaporizes before liquid water does. 

 No. It takes heat to go from solid ice to liquid water and then to vaporization. 

Consider the definition of density and how it is affected.

Which of the following occurs because molecules of water are farther apart in ice than in liquid water?

Water Density

This characteristic allows lakes to freeze solid.

This characteristic allows the surface water of lakes to freeze.

This characteristic ensures that salt water does not freeze.

This characteristic is not important for life.

Solid substances are normally more dense than liquid substances. However, solid ice is LESS dense than liquid water. Why is this characteristic of solid ice important for life?a) This characteristic allows lakes to freeze solid.b) This characteristic allows the surface water of lakes to freeze.c) This characteristic ensures that salt water does not freeze.d) This characteristic is not important for life.

Properties of Water- Density Example 1

How does temperature affect water density?

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