QUESTIONS FOR FURTHER THOUGHT AND REVIEW Why must particles be extremely small t
ID: 208224 • Letter: Q
Question
QUESTIONS FOR FURTHER THOUGHT AND REVIEW Why must particles be extremely small to exhibit Brownian movement ? . A gardener's favorite plant wilted several days after he applied twice the recommended amount of fertilizer. What probably happened ? Can you suggest a remedy ? . What is the difference between molecular motion and diffusion ? Indicate with an arrow the net movement of water between hypotonic and hypertonic solutions separated by a selectively permeable membrane. Hypotonic Solution Hypertonic Solution 5. What results do you have to support the conclusion that diffusion is inversely related to molecular weight? 6. Why are diffusion and osmosis referred to as physical, passive processes ? 7. In kidney dialysis, a patient's blood is passed through a bath that contains a mixture of several ions and molecules. The blood is separated from this fluid by a dialysis membrane that is permeable to water, small ions and small molecules, but is impermeable to proteins and blood cells. What should the composition of the dialysis fluid be for it to remove urea (small molecule) without changing blood volume (removing water)? 43Explanation / Answer
1) Brownian motion take places when molecules collide with small particles in a fluid. Each molecule has small mass, hence if the particle has significant size, the molecule won't have enough energy to move the particle by any significant amount and larger particles are being hit more frequently from all directions, there are more collisions and they tend to regular each other out.
2) A gardeners favorite wilted several days after she applied twice the recommended amount of fertilizer. The extra fertilizer forms a hypertonic surroundings, because the extra fertilizer doesn't dissolve in the water. This causes the plants become dehydrated because all the water has taken over by the fertilizer and the extra chemicals from the fertilizer slowly wilted and killed the plants.
3) Molecular motion is the movement of molecules in a substance without any external pressure whereas diffusion is the movement of molecules from a high concentrated area to a low concentration area.
Molecular motion is a random movement due to bumping of molecules. While diffusion is predictable movement, due to area of high concentration to low.
Diffusion is the process of molecules, which distribute themselves within a closed system by random motion. Since the motion is random, they tend to be evenly distributed. Diffusion is the result of molecular motion.
4) The flow of water will be from hypotonic solution to hypertonic solution. The arrow direction will be from left to right.