Obtain phase diagrams for water and carbon dioxide.

Based on the...

Question

Obtain phase diagrams for water and carbon dioxide. Based on the phase diagram for water, explain how it is possible to skate on ice, that is, solid water.

Phase diagram of water showing solid, liquid, and gas states at various pressures and temperatures.

Accepted Answer

Hello. In this problem, we're told the fallen figure is the phase diagram for water. How is skating on ice? Which is solid water possible? Let's look at our possible answers. A says when someone skates on ice skate blades apply heat on it which causes it to melt, creating a layer of liquid that makes it possible to glide across the ice. So this is incorrect. The skate are not going to apply heat to the ice. Be then says when someone skates on ice, the skate blades apply pressure on it which causes its melting point, decrease melting some of it and creating a layer of liquid that makes it possible to glide across the ice. So this is correct, the skate blades will apply pressure which will cause the melting point to decrease, creating some liquid which will make it possible to glide across the ice. So B is the correct answer. We'll look at the phase diagram in a minute to see why. This is the case. C says when someone skates on ice, the skate blades apply pressure on it which causes the melting point to increase melting some of it and creating a layer of liquid that makes it possible to glide across the ice. So it is true that the skate blades apply pressure on it, but it's not going to cause the melting point to increase. It's going to cause the melting point to decrease. So C is incorrect. D states cannot be determined. We determine that B is correct. So that means D is not correct looking at our phase diagram. So when the skate blades apply pressure, if we look at the equilibrium between the solid and our liquid, we see that it has a negative slope, that means then as the pressure increases, the melting point is decreasing, it's shifting to the left that will then allow for some of it to melt, creating a liquid layer that makes it possible to glide across the ice. So when we look again at answer B it says when someone skates on the ice, the skate blades apply pressure on it which causes this multi point to decrease melting some of it and creating a layer of liquid that makes it possible to glide on the ice. So this is our correct answer. Thanks for watching. Hope this helped.

Obtain phase diagrams for water and carbon dioxide. Based on the phase diagram for water, explain how it is possible to skate on ice, that is, solid water.

Concetti chiave

Phase Diagram

Triple Point

Pressure and Ice Skating

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