Gaines-Osmosis Practical Practice

Hypertonic...hypotonic

-If you soak your hands in dishwater, you may notice that your skin absorbs water and swells into wrinkles. This is because your skin cells are _______________ to the _______________ dishwater.

Flask X: Swell Flask Y: Unchanged Flask Z: Contract

•Flasks X, Y, and Z contain solutions with different concentrations of the solute NaCl. -Flask X has 0.5% NaCl -Flask Y has 0.9% NaCl -Flask Z has 1.5% NaCl •Red blood cells (0.9% NaCl) will be placed into each flask. Predict what will happen to the blood cells in each of the flasks.

Both bags will gain weight.

•Inside one osmosis bag*, A, is a 50% glucose solution and inside bag B is a 20% glucose solution. Both bags are put into beakers containing 100% water. •Osmosis bags are membranes that let water through but not glucose.

sea water is hypertonic to your body tissues and drinking it will cause you to lose water.

•Sea water is dangerous to drink because

a hypertonic sucrose solution

•The concentration of solutes in a red blood cell is about 2%. Sucrose cannot pass through the membrane, but water and urea can. Osmosis would cause red blood cells to shrink the most when immersed in which of the following solutions?

crenate.

•Wallway is a new general herbicide for aquatic plants. Its main ingredient is a marine salt solution. It is effective against freshwater but not saltwater plants. It works by breaking down the cell walls of the plants. The freshwater plants die because their cells

A.isotonic, hypotonic

•You decide to buy a new fish for your freshwater aquarium. When you introduce the fish into its new tank, the fish swells up and dies. You later learn that it was a fish from the ocean. •Based on what you know of tonicity, the most likely explanation is that the unfortunate fish went from a(n) _______________ solution into a(n) _______________ solution.

They will shrink.

•A 0.9% NaCl solution is isotonic to red blood cells. Which of these describes the results if red blood cells are placed into a 9% solution of NaCl?

crenate if its membrane is impermeable to the salt and permeable to the water.

•A red blood cell has a salt concentration of 0.9%. What will happen if it is placed into a 1% salt solution? The red blood cell will

hypotonic

•If the volume of a cell increases when it is placed in a solution, that solution is said to be __________ to the cell.

hypertonic, greater

•In osmosis, water always moves toward the ____ solution: that is, toward the solution with the ____ solute concentration.