Chemistry: Lab Quiz – Flashcards
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In making pickles, a cucumber is placed in a strong salt solution. Explain what happens.
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The water in the pickle migrates into the saline solution by way of osmotic action through the semipermeable membrane in the pickle's skin.
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Why is it important that cell membranes are semipermeable membranes?
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It is important because cells need certain materials to survive, but if other materials enter the cell they could destroy the cell.
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What is the difference between osmosis and dialysis?
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Osmosis affects only soluble molecules that can pass through a membrane that is impenetrable to solutes. In dialysis, both solvents and solutes are diffused through porous membranes.
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How does an artificial kidney separate waste products from the blood?
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The dialysis machine takes the blood in your veins. Then it takes it through a series of tubes which undergoes filtration by use of reverse osmosis. The clean blood is returned to the body.
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What does the pH of a solution tell you?
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It tells you if the hydronium ion concentration of a solution is acidic, basic or neutral.
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What is neutralization?
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It is a reaction which results when the protons from the acid combine with the hydroxide ions from the base to produce water and a salt.
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What is a buffer?
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It contains a weak acid and the salt of that acid. It maintains the pH of a solution by reacting with small amounts of acids or bases.
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Osmosis
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The flow of a solvent, usually water, through a semipermeable membrane into a solution of higher solute concentration
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Solution
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A homogeneous mixture in which the solute is made up of small particles that can pass through filters and semipermeable membranes.
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Suspension
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A mixture in which the solute particles are large enough and heavy enough to settle out and be retained by both filters and semipermeable membranes.
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Colloid
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A mixture that has particles that are moderately large. They can pass through filters but cannot pass through semipermeable membranes.
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Hypertonic
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Hypertonic refers to a solution with higher osmotic pressure than another solution.
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Isotonic
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Isotonic refers to a solution with the same osmotic pressure of another solution.
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Hypotonic
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A hypotonic solution is any solution that has a lower osmotic pressure than another solution.
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Crenation
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The shriveling of a cell because of waters leaving the cell when the cell is placed in a hypertonic solution.
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Hemolysis
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A swelling and bursting of red blood cells in a hypotonic solution because of an increase in fluid volume.