Sciences - Co-ordinated (9-1) - 0973 CIE

Diffusion

Bayani Gaba-gaba

Open a bottle of perfume in one corner of a room and soon you can smell it everywhere. The scent particles have spread out by diffusion, moving from where they were crowded to where they were sparse, with no pump or effort. Your cells use this same free process every second to take in oxygen and get rid of carbon dioxide.

In this lesson you will learn exactly what diffusion is, where its energy comes from, why it is vital to living organisms, and how surface area, temperature, concentration gradient and distance change its rate.

Manufura

Describe diffusion as the net movement of particles from a region of their higher concentration to a region of their lower concentration (i.e. down a concentration gradient), as a result of their random movement
State that the energy for diffusion comes from the kinetic energy of random movement of molecules and ions
State that some substances move into and out of cells by diffusion through the cell membrane
Describe the importance of diffusion of gases and solutes in living organisms
Investigate the factors that influence diffusion, limited to: surface area, temperature, concentration gradient and distance

Takardar Darasi

Diffusion moves gases and dissolved substances into and out of every cell without using any of the cell's energy. Gas exchange in lungs, leaves and gills, and the absorption of digested food, all depend on it. Examiners want the precise definition and a clear explanation of how each factor changes the rate, so this is a high-value topic.

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Nazarin Darasi

Barka da kammala darasi akan Diffusion. Yanzu da kuka bincika mahimman raayoyi da raayoyi, lokaci yayi da zaku gwada ilimin ku. Wannan sashe yana ba da ayyuka iri-iri Tambayoyin da aka tsara don ƙarfafa fahimtar ku da kuma taimaka muku auna fahimtar ku game da kayan.

Za ka gamu da haɗe-haɗen nau'ikan tambayoyi, ciki har da tambayoyin zaɓi da yawa, tambayoyin gajeren amsa, da tambayoyin rubutu. Kowace tambaya an ƙirƙira ta da kyau don auna fannoni daban-daban na iliminka da ƙwarewar tunani mai zurfi.

Yi wannan ɓangaren na kimantawa a matsayin wata dama don ƙarfafa fahimtarka kan batun kuma don gano duk wani yanki da kake buƙatar ƙarin karatu. Kada ka yanke ƙauna da duk wani ƙalubale da ka fuskanta; maimakon haka, ka kallesu a matsayin damar haɓaka da ingantawa.

Diffusion is the net movement of particles: A. from low to high concentration B. from high to low concentration C. only of water D. using energy from respiration Answer: B
The energy for diffusion comes from: A. respiration in the cell B. active transport C. the kinetic energy of the particles D. sunlight Answer: C
Which change would speed up diffusion? A. lower temperature B. smaller surface area C. steeper concentration gradient D. greater distance Answer: C
A larger surface area increases the rate of diffusion because: A. particles move slower B. more particles can cross at once C. the gradient disappears D. energy is added Answer: B
Which substance does NOT normally cross the cell membrane by diffusion? A. oxygen B. carbon dioxide C. large protein molecules D. water Answer: C