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Courtesy of Alzet Osmotic Pumps Pharmaceutics Cancer Treatments Painkillers Agriculture Fertilization of crops Fragrances Air freshener Bug repellant
#1: Semi-permeable membranes and controlled concentrations can create a zero-order rate of diffusion. #2: Polar membranes diffuse polar substances like alcohols at a zero- order rate.
J = mass flux D = diffusion co- efficient dC = C IN - C OUT dX = thickness of membrane
(Ra) 2 = 4(δ D1 -δ D2 ) 2 + (δ P1 -δ P2 ) 2 + (δ H1 - δ H2 ) 2 RED = Ra/Ro δ D = London dispersion forces δ P = Dipole-dipole interactions δ H = Hydrogen bonding Ra = Solubility difference Ro = Solubility radius RED = Relative energy difference
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Citric AcidAscorbic Acid Acetylsalicylic Acid g/100 mL33.O g/100 mL0.30 g/100 mL
Chemistry of Water Chapters What Makes Water So Special? Polarity- waters bent shape creates δ- and δ+ areas in the molecule.
Osmosis Osmosis is the net movement of water molecules over a partially permeable membrane from an area of less osmotic potential to an area of more negative.
Cell Membrane & Cellular Transport Homeostasis – the maintenance of internal stable conditions The cell membrane keeps the cell in balance.
Plasma Membrane Notes. CHARACTERISTICS: Maintains homeostasis (balance with environment) Selective permeability – allows some molecules into the cell.
Kinetic Molecular Theory & Intermolecular Forces OR KMT & IMFs Chapter 13 – 2010 – Mr Nelson.
Regents Biology Cell Membranes & Movement Across Them.
Passive Transport Substances cross the cell membrane without the cell expending energy.
Chapter 7: Cells and Their Environment. Cell Membrane 1. Function Selectively (semi-) permeable a. Some substances can pass through but others cannot.
1.14. Simple diffusion is defined as “the movement of particles from an area where they are more highly concentrated to an area where they are less.
Cell Membranes Osmosis and Diffusion. Functions of Membranes 1. Protect cell 2. Control incoming and outgoing substances 3. Maintain ion concentrations.
Cell Structure & TRANSPORT. Cell Structure Cytoplasm Fluid material in which the cell contents are suspended 75% - 90% water Cytoskeleton framework of.
Ground Rules of Metabolism Chapter 5. What is Energy? Capacity to do work Forms of energy –Potential energy –Kinetic energy –Chemical energy.
MOVING MATERIALS INTO AND OUT OF CELLS. MATERIAL MOVEMENT PASSIVE TRANSPORT ACTIVE TRANSPORT.
Water and Aqueous Systems Chapter 15. Properties of Water High surface tension Low vapor pressure High boiling point **All due to high intermolecular.
Water – The Unique Substance VCE Chemistry Unit 2: Environmental Chemistry Area of Study 1 – Water.
B4 a-d Pig (H). What is the job of air spaces?
Cell Transport Study Guide. 1. Which forms of transport do NOT require energy? Diffusion Osmosis Facilitated Diffusion *All of these are passive!
Matter (Review and New) Recall that all matter can be classified as a mixture or a substance. Up to now we have concentrated on how to classify matter.
Chapter 36 Transport in Vascular Plants. A. Physical Forces H2OH2O CO 2 O2O2 light sugar H2OH2O CO 2 O2O2 minerals.
Terms Active transport Amphipathic Aquaporin Concentration gradient Co-transport Diffusion Electrochemical gradient Endocytosis Exocytosis Facilitated.
+ Chapter 13: States of Matter Gases Kinetic Molecular Theory—attempts to explain the properties of gases. Assumes: Particles are small and separated.
Biological Membranes. Biological membranes Biological membranes Complex, dynamic structures made of lipid and protein molecules Complex, dynamic structures.
Cell membranes and exchange of material HBS 3A. Exchange of material Occurs at the cell membrane Involves the intake of essential materials eg nutrients.
HQ State two functions of the xylem tissue.
SC.912.L How does something as thin as a cell wall or membrane protect a cell?
Homeostasis depends in part on appropriate movement of materials across the cell membrane. Homeostasis refers to the necessity of an organism to maintain.
Diffusion, osmosis, and the cell membrane. A membrane is a collage of different proteins embedded in the fluid matrix of the lipid bilayer. Membranes.
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