Question

Dittusion of Molecules In this exercise you will investigate characteristics of molecules that facilitate diffusion, factors that influence diffusion rates, and diffusion of solutes through a selectively permeable membrane. Experiment A. Kinetic Energy of Molecules Materials dropper bottle of water slide and coverslip carmine powder (KM,04 compound microscope dissecting needle assim perman Introduction Molecules of a liquid or gas are constantly in motion because of the intrinsic kinetic energy in all atoms and molecules. In 1827, Robert Brown, a Scottish botanist, noticed that pollen grains suspended in water on a slide appeared to move by a force that he was unable to explain. In 1905, Albert Einstein, searching for evidence that would prove the existence of atoms and molecules, predicted that the motion observed by Brown must exist, although he did not realize that it had been studied for many years. Only after the kinetic energy of molecules was understood did scientists ask if the motion observed by Brown and predicted by Einstein could be the result of molecular kinetic energy being passed to larger particles. We now know that intrinsic molecular kinetic energy is the driving force of diffusion. In this experiment, you will observe large particles suspended in water in motion similar to that observed by Brown, traditionally called Brownian movement. You will relate the motion observed to the forces that bring about diffusion. Procedure Work in pairs. One person should set up the microscope while the other person makes a slide as follows: 1. Place a drop of water on the slide. 2. Touch the tip of a dissecting needle to the drop of water and then into the dry carmine * Potassium permanganate 3. Add the gamme on the needle to the drop of water on the slide, mix, cover with a coverslip, and observe under the compound microscope. 4. Observe on low power and then high power. Focus as much as possible on one particle oferite. 5. Record your findings in the Results section, and draw conclusions based on your results in the Discussion section. Results Describe the movement of single carmine particles. 1. Is the movement random or directional? 2. Does the movement ever stop?

Answer 1

Answer:

The single acetocarmine particle moves in random direction. There is found continuous movement of the acetocarmine particle because of presence of intrinsic kinetic energy found in this particle. This kind of movement of acetocarmine molecule is said to be Brownian movement.

1) The movement of acetocarmine particle is random.There is not found any specific diewction of the particle. It is directionless movement.

2)The movement does not ever stop. The presence of intrinsic kinetic energy in the particle provide the non stopable movement to acetocarmine particle.