Assignment #2- Properties of Water
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- Date Submitted: 03/23/2016 09:30 AM
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Douglas Lesko
BIOL-111-550
Assignment #2- Properties of Water
Background
Diffusion is characterized by “the movement of solute molecules from an area of high concentration to an area of low concentration” (Harris-Haller 27). While diffusion deals with solute molecules and passive transport deals with those solute molecules “moving across the plasma membrane” (Harris Haller 26), osmosis is the diffusion of water molecules across the plasma membrane (Harris-Haller 26). “Biologists use water potential to describe the tendency of water to move from one place to another” (Harris-Haller 30) and the “pressure needed to stop the net movement of water is the osmotic pressure” (Harris-Haller 30). The point of this experiment is to explore the properties of water by measuring its rate of diffusion with its relationship to its relative temperature.
Diffusion Across a Membrane Experiment
Hypothesis: If I put potassium permanganate in petri dishes of water with different temperature and one dish with agar, the potassium permanganate will diffuse faster in the warmer water and diffuse slower in the agar and colder water.
Null Hypothesis: If I put potassium permanganate in petri dishes of water with different temperatures and one dish with agar, the potassium permanganate will diffuse slower in the warmer water and diffuse faster in the agar and colder water.
In an animal cell, the outer most layer of the cell is the plasma membrane, which is the “bilayer sheet of phospholipid molecules” (Harris-Haller 26). These “molecules have a polar and nonpolar end, the polar end is hydrophilic and the nonpolar end is hydrophobic” (Harris-Haller 26).
The protocol includes the following: first obtain 5 petri and dishes, potassium permanganate, a timer, five rulers, agar, water at room temperature, ice, and warm water. Set the experiment up by placing the five petri dishes out and putting the five different variables separately in each. Leave one dish empty to act as the control....
BIOL-111-550
Assignment #2- Properties of Water
Background
Diffusion is characterized by “the movement of solute molecules from an area of high concentration to an area of low concentration” (Harris-Haller 27). While diffusion deals with solute molecules and passive transport deals with those solute molecules “moving across the plasma membrane” (Harris Haller 26), osmosis is the diffusion of water molecules across the plasma membrane (Harris-Haller 26). “Biologists use water potential to describe the tendency of water to move from one place to another” (Harris-Haller 30) and the “pressure needed to stop the net movement of water is the osmotic pressure” (Harris-Haller 30). The point of this experiment is to explore the properties of water by measuring its rate of diffusion with its relationship to its relative temperature.
Diffusion Across a Membrane Experiment
Hypothesis: If I put potassium permanganate in petri dishes of water with different temperature and one dish with agar, the potassium permanganate will diffuse faster in the warmer water and diffuse slower in the agar and colder water.
Null Hypothesis: If I put potassium permanganate in petri dishes of water with different temperatures and one dish with agar, the potassium permanganate will diffuse slower in the warmer water and diffuse faster in the agar and colder water.
In an animal cell, the outer most layer of the cell is the plasma membrane, which is the “bilayer sheet of phospholipid molecules” (Harris-Haller 26). These “molecules have a polar and nonpolar end, the polar end is hydrophilic and the nonpolar end is hydrophobic” (Harris-Haller 26).
The protocol includes the following: first obtain 5 petri and dishes, potassium permanganate, a timer, five rulers, agar, water at room temperature, ice, and warm water. Set the experiment up by placing the five petri dishes out and putting the five different variables separately in each. Leave one dish empty to act as the control....