Questions Questions 1 If diffusion is the only force acting on a substance, then

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Questions Questions 1 If diffusion is the only force acting on a substance, then the substance will move from and area of area of 2 The unit of diffusion coefficient is (1) m2 s1 (2) m2 s-1 (3) m2 s-2 (4) m2 s2 concentration to an concentration 3 If the surface area for diffusion increases, 4 The movement of a substance from an area of high concentration to an area of lower concentration is called the rate of diffusion will (increase/decrease) A: osmosis B: diffusion C: equilibrium 5 If the temperature decreases, the rate of diffusion will (increase/decrease) 6 Diffusion of oxygen in air takes place as a result of: (a) convection currents b) air movement c) random movement of molecules d) increase in temperature Tue or false: Under the correct conditions, it is possible for diffusion to move a substance from an area of low concentration to an area of high concentration 7 If the diffusion distance decreases, the rate of diffusion will (increase/decrease) 8

Explanation / Answer

Ans 1

If diffusion is the only force acting on a substance, then the substance will move from and area of high concentration to an area of lower concentration.

Ans 2

Unit of diffusion coefficient = m2/s = m2 s-1

Ans 3

If the surface area for diffusion increases, the rate of diffusion will increase. Because the molar flux is directly proportional to the surface area of diffusion.

4 The movement of a substance from an area of high concentration to an area of lower concentration is called diffusion.

5. If temperature decreases, rate of diffusion will decreases. Diffusion depends on the movements of the molecules. Higher the temperature, higher the movement of the molecules.

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