Bio Lab

EXERCISE 3
PHYSICO-CHEMICAL REACTIONS IN THE CELL
ACTIVITY SHEET

BROWNIAN MOVEMENT:

1. What is Brownian movement?
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2. Is there a difference in the speed of movement among the different sized particles of India ink? If so, explain the difference.
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3. Is there a difference in the speed of movement of the India ink particles in hot and cool slides? If so, explain.
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DISPERSION SYSTEMS IN PROTOPLASM

4. DEFINE THE FF: a. Solute: The dissolve matter in a solution; The component of a solution that changes its state b. Solvent: A liquid substance capable of dissolving other substances c. Mixture: a substance consisting of two or more substance mixed together d. Solution: A homogeneous mixture of two or more substances e. Emulsion: a colloid in which both phases are liquids f. Suspension: a mixture in which fine particles are suspended in a fluid where they are supported g. Colloidal dispersion: a colloid that has continuous liquid phase in which a solid is suspended in a liquid.

5. How do you classify the four mixtures used: a. Salts and water

b. Clay and water

c. Mineral oil and water

d. Gelatin and water

ORGANIC AND INORGANIC COMPOUNDS 6. List below the substances which were heated and indicate which left a black residue in the test tube, showing that they are organic
Substance: black residue (YES or NO)
*Sugar-------------------------------------- Yes
*Gelatin----------------------------------- Yes
*Meat-------------------------------------- Yes
*Baking Soda------------------------------ No
*Salt----------------------------------------- No

7. What element in organic compounds causes the formation of black residue?
-The element in organic compound that causes the formation of black residue is Carbon

TEST FOR PRENSENCE OF LIPIDS

8. Indicate the results that were obtained in the grease spot test. Explain... [continues]
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