RSG6.2MOD.docx


 * RSG CHAPT. 6 **** .2 Name ___ **


 * // PART 1. //**
 * // In your textbook, read about water and its importance. //**


 * // PART 2. //**
 * For each statement below, circle T - true or F - false. **
 * Correct the part that makes the sentences false **


 * T - F **** 1. ** In a water molecule, electrons are shared equally between each hydrogen atoms and oxygen atom.


 * T - F **** 2. ** The attraction of opposite charges between hydrogen and oxygen forms a weak oxygen bond.


 * T - F **** 3. ** Because of its polarity, water can move from the roots of a plant up to its leaves.


 * T - F **** 4. ** Water changes temperature easily.


 * T - F **** 5. ** Unlike most substances, water expands when it freezes.


 * // PART 3. //**
 * Circle the letter of the best choice to completes the statement. **


 * 6. ** All objects in motion have
 * a. ** potential energy.
 * b. ** heat energy.
 * c. ** kinetic energy.
 * d. ** random energy.


 * 7. ** The first scientist to observe the random motion of molecules was
 * a. ** Brown.
 * b. ** Darwin.
 * c. ** Mendel.
 * d. ** Hooke.


 * 8. ** The net movement of particles from an area of higher concentration to an area of lower concentration is called
 * a. ** dynamic equilibrium.
 * b. ** nonrandom movement.
 * c. ** concentration gradient.
 * d. ** diffusion.


 * 9. ** Diffusion occurs because of
 * a. ** nonrandom movement of particles.
 * b. ** random movement of particles.
 * c. ** a chemical reaction between particles.
 * d. ** chemical energy.


 * 10. ** When a few drops of colored corn syrup are added to a beaker of pure corn syrup, the color will
 * a. ** move from low concentration to high concentration.
 * b. ** form a polar bond.
 * c. ** start to diffuse.
 * d. ** remain on the bottom of the beaker.


 * 11. ** Diffusion can be accelerated by
 * a. ** decreasing the pressure.
 * b. ** increasing the temperature.
 * c. ** decreasing the movement of particles.
 * d. ** increasing the dynamic equilibrium.

The cell is in a state of
 * 12. ** When materials pass into and out of a cell at equal rates, there is no net change in concentration inside the cell.
 * a. ** dynamic equilibrium.
 * b. ** metabolism.
 * c. ** imbalance.
 * d. ** inertia.


 * 13. ** The difference in concentration of a substance across space is called
 * a. ** dynamic equilibrium.
 * b. ** concentration gradient.
 * c. ** diffusion.
 * d. ** Brownian movement.