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HCCFL / Biology / BIOL 1005 / the color spreads outward because

the color spreads outward because

the color spreads outward because

Description


What can you say about the diffusion rate in a liquid based on your results?




∙ In general what is the effect of the type of medium on the diffusion rate?




∙ In the region of high concentration from each substance why is there a net movement of molecules outward?



Diffusion ∙ Concentration gradient is the factor that determines the  direction of the diffusion in all cases ∙ Molecular speed depends on molecular weight,  temperature, and type of medium ∙ DiffusiWe also discuss several other topics like mme unl
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on occurs most easily in air than liquid then a semi solid ∙ The explanation of the mechanism of diffusion of  molecules spread randomly from areas of high  concentration to areas of lower concentration ∙ Diffusion occurs in air liquid and semi-solids ∙ The color spreads outward because there is a net  movement of a substance from an area of high  concentration to low concentration ∙ The greater the concentration of gradient the faster the  diffusion rate ∙ The concentration gradient from high concentration to low  determines the direction of the diffusion ∙ In the region of high concentration from each substance  why is there a net movement of molecules outward? There are more molecules to collide with in the region of high  concentration ∙ In general what is the effect of the type of medium on the  diffusion rate? Diffusion rate is greater in fluid media than  solid ∙ The average diffusion rate in a semi solid like agar is  around 50mm/h over the first 15 minutes. What can you  say about the diffusion rate in a liquid based on your  results? It is greater than the diffusion speed in a semi solid∙ Based on your experiments you can say that the  ammonium chloride Cloud forms? Closer to the HCL source ∙ The ammonium chloride Cloud forms closest to the  substance with the higher molecular weight because the  higher molecular weight substance diffuses more slowly  than the lighter one ∙ The molecular weight of HCL is greater than that of  ammonia and diffusion speed decreases as molecular  weight increases ∙ Dialysis tubing is selectively permeable this means that  some solutes will pass through and others not ∙ For a solid to diffuse across a membrane there must be  unequal concentrations on either side of the membrane in  the membrane is permeable to the solute ∙ Iodine is added to an unknown solution and it turns from a  light yellow color to a blue-black color what does this  indicate about the solution to the iodine was added? The  unknown solution contain starch ∙ Which solute is too large to diffuse through a dialysis  tubing membrane? Starch ∙ What factor determines which solutes can pass through  the membrane of dialysis tubing? Molecular size ∙ What does the dialysis tubing represent in your  experiment? A cell membrane ∙ What is the purpose of adding iodine into this experiment? It will indicate the presence of starch ∙ Dialysis tubing is rather stiff. What will you do to make it  more pliable? I will soak it in water until it’s pliable  ∙ What to do in your experiment diffuse from the dialysis  tubing bag into the beaker? Glucose 2∙ Which solute could diffuse from the beaker into the bag? Iodine ∙ Which solute is too large to diffuse through the  membrane? Starch ∙ Net diffusion will always occur from high to low  concentration ∙ Which of the following is an example of molecular  Movement by diffusion? A bottle of perfume is opened  at the front of the classroom and 10 minutes later  you can smell it in the back of the classroom ∙ Which of the following is true of passive transport  mechanisms like diffusion? The transports substances  from high areas of concentration to low ∙ Send membrane transport mechanisms utilized by cells  are active, but others are passive. Which of the following  are ways in which active and passive mechanisms differ? Active mechanisms require the use of cellular  energy in the form of ATP, active mechanisms can  be used to transport substances from low  concentration to high, passive mechanisms like  diffusion can only transport from high concentration to low ∙ How does a concentration gradient affect diffusion rate? The bigger the gradient the faster the rate ∙ Oxygen diffuses from the blood to the tissues of the body.  Which of the following statements is true of the movement of oxygen? It moves from an area of high  concentration in the blood to low concentration in  the tissues ∙ Diffusion is a passive process because no cellular energy is used for this mechanism 3∙ Diffusion is considered a passive transport mechanism this means that sell do not expend ATP in order for diffusion to  occur ∙ If your experiments were allowed to continue for an  indefinite period of time what would eventually happen? Dynamic equilibrium when all the solutes are evenly dispersed ∙ When there are areas of high and low concentration of a  solute, a concentration gradient exists. As the molecules  found in Collide, there will be a net movement in which  direction? From high solute concentration to low ∙ Where does the energy that drives diffusion come from? The motion of molecules ∙ Diffusion differs from active transport in which of the  following ways? Diffusion occurs due to random  kinetic energy in the molecules 4

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