Lab 18 copy - Solutions Colloids and Suspensions Pre-Lab...

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Solutions, Colloids, and Suspensions Pre-Lab Study Questions 1. In making pickles, a cucumber is placed in a strong salt solution. Explain what happens. The water molecules from the higher concentration move down the gradient to an area of lower concentration. In this case, the water molecules of the cucumber will move outward causing a "pickling" effect (crenation) 2. Why is it important that cell membranes are semipermeable membranes? The membranes must be semi permeable so certain substances are able to pass thru but keep other substances out. It protects the cell 3. What is the difference between osmosis and dialysis? In osmosis a semi permeable membrane is used where in dialysis a differential membrane is used 4. How does an artificial kidney separate waste products from the blood? Arterial blood flows from the patient to the dialysis machine that contains thedialysis tubing (a long, coiled cellophane tube) that acts as a differentially permeable membrane. Around this tube is a solution called
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