Question

Please select ONE of the questions below to answer. Use GCU style (no first-person, no contractions, no quotes). Support your response with references from course articles or text readings. Every student’s response is expected to have examples and demonstrate understanding of chemistry.

DQ1

1. Pressure changes are utilized in many common items, internal combustion engines, vacuum cleaners, etc. Describe a unique example of a commonly exploited pressure change and how it is works.

2. Provide a unique and common example of diffusion. Your answer should include the molecules involved and the types of factors that might affect the diffusions of said molecules.

3. The ideal gas law encompasses many other laws. Provide a unique example that follows the ideal gas law and specify how it is applied.

use 100 words or more, include a source, don not copy and paste

Answer 1

I am going to answer the second question.

Suppose perfume is sprayed in one corner of the room. You can smell the scent of it at the other end of room because of diffusion. Diffusion is a process of movement of particles from a region of higher concentration to a region of lower concentration. When perfume is sprayed across one end of the room, the concentration of perfume particles increases at this end of the room creating a concentration difference. So this end of the room is at a higher concentration than the other end of the room which is at a lower concentration; So the molecules of the scent travel from this end to the other end because of concentration difference.

The temperature inside the room is increased, it takes less time for particles to diffuse from this end to the other end. If the temperature if the room is decreased, then it takes longer time for particles to diffuse from this end to the other end.

So Diffusion increases with increase in temperature.

The medium in which diffusion takes place also plays a vital role. The room is filled with air which acts as a diffusion medium. The particles of the scent collide with the particles of the air which reduces rate of diffusion.The air particles have large spaces between them so less number of collisions occur which leads to better diffusion.