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14.5 Expressing Solution Concentration -- Part 3
Wood frog are able to partially freeze in cold winters.
A wood frog has no heartbeat, no blood circulation, no breathing, and no brain activity in its partially frozen state.
The vital functions are back within 1-2 hours.
The water within the cells of cold-blooded animals can't survive in the cold.
When water is frozen, it expands irreversibly, damaging cells.
When the wood frog is not active during the winter, it produces large amounts of sugar in its bloodstream and fills the inside of its cells.
When the temperature drops below freezing, the frog's abdominal fluids freeze solid.
The wood frog is able to survive the winter by partially freezing.
It is freezing point.
Frog's cells act as antifreeze, preventing the water within the cells from acting as an antifreeze, by flooding them with concentrated glucose.
Nature's tendency to mix makes concentrated solutions draw solvent from more dilute solutions.
An osmosis cell is shown in Figure 14.16V.
There is a concentrated saltwater solution on the left side of the cell, and pure water on the right side.
The two halves of the cell are separated by a membrane that allows some substances to pass through but not others.
The left side of the cell has a higher water level than the right side.
The process can be reversed if external pressure is applied to the water in the left side.
The osmotic pressure of the solution is 2.95 torr.
The total amount of theprotein per solution is 10.0 mL.
The given osmotic pressure and temperature can be used to find the molarity of the solution.
From step 2 to 3, use the given mass and the number of Molar mass to calculate the molar mass of the moles.
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