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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.

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SIMPLE DIFFUSION

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  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

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