Question

6 microscopes slides and coverslips Vinegar Compound microscope PRE-LAB QUESTIONS 1. Define diffusion. Define osmosis. 2. diffusion being Which factors that influence the rate in 3. n. INTRODUCTION Living organisms are roughly 75-85% water. This makes water the universal solvent for biological solutions. Sugars, proteins, electrolytes, and organic molecules such as hormones are examples u In fa st all.cubctancer entering or leaving cells of difforont hielegieal ce.. dieeiad in

Answer 1

1. Diffusion is the process of the movement of molecules down the concentration gradient in the form of passive movement i.e. without using any energy from a higher concentration to a lower concentration separated by a semi-permeable membrane.

2. Osmosis is a type of diffusion where the molecules of a solvent pass from a lower concentrated solution to a higher concentrated solution through a semi-permeable membrane.

3. (**note: Without knowing the practical it is impossible to determine which will be the factor being tested affecting the rate of diffusion. So, I am listing all the possible factors. Hope it helps.)

Factors affecting the rate of diffusion:

a. Temperature: Higher the temperature more the diffusion of particles.

b. Permeability: More permeable the membrane is, faster will be the diffusion of particles.

c. Surface area: More the surface area, more the diffusion.

d. Concentration gradient: Higher the concentration gradient, faster the diffusion.

e. Size of particle: Smaller the particle, faster the diffusion.

f. Diffusion medium: In solid medium diffusion is slower. In liquid medium, diffusion is relatively faster. And in gas, the diffusion is fastest.

g. Distance: Greater the distance to cross during diffusion, slower the rate of diffusion.