1 / 17

SIMPLE DIFFUSION

SIMPLE DIFFUSION. WHAT IS DIFFUSION. Diffusion is the movement of molecules or particles from a region of high concentration to a region of low concentration OR We can say molecules or particles move from an area where there is more particles or molecules to an area where there is less.

sun
Télécharger la présentation

SIMPLE DIFFUSION

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. SIMPLE DIFFUSION

  2. WHAT IS DIFFUSION • Diffusion is the movement of molecules or particles from a region of high concentration to a region of low concentration OR • We can say molecules or particles move from an area where there is more particles or molecules to an area where there is less

  3. HOW DIFFUSION OCCCURS • Molecules and particles are in constant random motion. • This is due to the energy that they posses; this is known as KINETIC ENERGY • Solids are closely packed so they vibrate and contain little kinetic energy • Liquids move around to occupy the space of the container and contain more kinetic energy so they move more • Gases move about freely in space and contains lots of kinetic energy so they can move faster

  4. HOW DIFFUSION OCCURS • When molecules or particles are mixed the kinetic energy they posses allows them to move about until they are evenly distributed • So the amount of kinetic energy a molecule posses will determine how fast it diffuses • However there are other factors that will affect the rate of diffusion or how fast diffusion occurs

  5. MORE ON DIFFUSION • Diffusion can occur with: • liquids and solids (water and dye) • different liquids (water and ink) • different gases (gases in the air) • When particles or molecules are evenly mixed no more changes occur • We can compare the rate of diffusion of different substances

  6. MORE ON DIFFUSION • Diffusion occurs everywhere but can be demonstrated in the lab with different chemicals • The rate of diffusion is affected by the size of the molecules and temperature • The larger the molecules the slower it will move therefore smaller molecules will move faster and diffuse faster • At higher temperatures particles or molecules posses more kinetic energy and therefore the higher the temperature the faster the rate of diffusion

  7. EXAMPLES OF DIFFUSION • When you smell a flower • When someone sprays perfume on one side of the room and the person on the other side smells it • When we add dye to water in celebrating Phagwa • When making cool aid

  8. DIFFUSION IN CELLS • Diffusion occurs in the cells of living organism • This is how cells get substances across the membrane • Remember the cell membrane is partially permeable so not every particle will pass through it. • There are molecules in the cell membrane that facilitates or makes it easier for the movement of these particles. This is know as facilitated diffusion and occurs in cells • Facilitated diffusion is a method of transporting substances across the membrane, however diffusion is the movement of particles from a region of high concentration to a region of low concentration

  9. DIFFUSION OF OXYGEN IN THE LUNGS • The oxygen you breathe in diffuses across the cell membrane in your lungs to get to your blood so that it can be transported to other cells. There is a high concentration of oxygen molecules in the lungs and a low concentration in the blood vessel around the lung, therefore the oxygen will diffuse across the membrane from the lung into the blood.

  10. DIFFUSION OF CARBON DIOXIDE • The carbon dioxide is diffused across the cell membrane of plant cells from the atmosphere for photosynthesis

  11. QUESTION 1. Simple diffusion is defined as the movement of • molecules from areas of higher concentration to areas of lower concentration. • molecules from areas of lower concentration to areas of higher concentration. C) water molecules across a membrane. D) gas molecules across a membrane. E) gas or water molecules across a membrane.

  12. 2. The rate of diffusion is affected by which of the following? A) temperature B) size of molecules C)A and B 3. Diffusion is one of the processes whereby materials are exchanged between a cell and its environment. True False 4. Which of the following best describes facilitated diffusion in cells A) a method of transporting molecules and particles across a membrane from a region of high concentration to a region of low concentration B. a method of transporting molecules and particles across a membrane from a region of low concentration to a region of high concentration C. Movement of molecules through the membrane from any direction

More Related