Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people, just like you, are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
Solved

How do gases compare with liquids and solids in terms of the distance between their molecules ?

Posted on 2007-03-31
2
1,395 Views
Last Modified: 2008-02-01
hi,
i am working on a project and i am stuck on this topic.
How do gases compare with liquids and solids in terms of the distance between their molecules ?

thanks
0
Comment
Question by:c_hockland
2 Comments
 
LVL 36

Accepted Solution

by:
Zyloch earned 250 total points
ID: 18831188
Gases molecules are far more apart than solids and liquids. A substance becomes a gas when its molecules have enough energy to escape from any attraction to each other. The collision theory assumes these gas molecules are like little spheres that move randomly and bounce off other objects.

In general, 1 mole of a gas at 0 degrees Celsius and 1 atmosphere of pressure has a volume of 22.4L (low density). Compare that to liquid water, which has a density of about 1 g/mL. 1 mole of liquid water would only be about 18 mL! Liquids and solids are clearly seen to have all their molecules seemingly attached to each other; they are condensed into a small space and are thus distinctly visible with clear boundaries. Gas molecules have no such restrictions.

In particular, if you increase the pressure on a gas enough, the volume decreases, the molecules will not have enough room to move away from each other and will end up sticking to one another. They will in effect become a solid or a liquid. Thus, gas molecules can be seen to be much farther apart than those of solids and liquids.
0
 
LVL 11

Assisted Solution

by:neopolitan
neopolitan earned 250 total points
ID: 18832724
Solid, liquid, gas and plasma are the different states of the matter. Solids hold their shape.The molecules of a solid don't move around very much. They tend to stay relatively close to each other. Liquids donot hold their shape and therefore,they flow. However, at the same temperature,  liquids do keep the same volume. The molecules of a liquid move around relative to each other.  But they are still bound to each other through intermolecular forces.These forces hold liquid molecules together. Gases donot keep their shape or volume. Gas molecules donot interact much and are not held together strongly.
 
When heat is applied, the kinetic energy of the molecules increase; in a solid, the molecules will start moving around relative to each other, and when this happens, the solid melts to become liquid. If heated further,the liquid  molecules start moving so fast that the intermolecular pressure becomes negligible, the liquid becoming gas.  

The difference between the different states is not just the difference in molecular separation, but also in intermolecular forces and kinetic energies. Kinetic molecular theory of matter explains these points:
http://online.redwoods.cc.ca.us/instruct/milo/6/sld005.htm

http://itl.chem.ufl.edu/2041_f97/lectures/lec_g.html

http://www.che.ilstu.edu/teach.chem/Teach.chem%20CD%20burning%202002%20ISU/Charles%20Lee%20-%20Intro%20to%20Kinetic%20Theory/Intro%20Kinetic-Molecular%20Theory/Kinetic-Molecular%20Theory%20of%20Matter.ppt

http://www.chem.arizona.edu/~salzmanr/480a/480ants/kmtmod/kmtmod.html


0

Featured Post

Free Tool: Subnet Calculator

The subnet calculator helps you design networks by taking an IP address and network mask and returning information such as network, broadcast address, and host range.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Error in calculation 3 55
Maths question - easy points 12 70
algorithm 15 116
Maximum possible 10 character string combinations from 36 unique characters 18 91
Have you ever thought of installing a power system that generates solar electricity to power your house? Some may say yes, while others may tell me no. But have you noticed that people around you are now considering installing such systems in their …
We are taking giant steps in technological advances in the field of wireless telephony. At just 10 years since the advent of smartphones, it is crucial to examine the benefits and disadvantages that have been report to us.
This is a video describing the growing solar energy use in Utah. This is a topic that greatly interests me and so I decided to produce a video about it.
Although Jacob Bernoulli (1654-1705) has been credited as the creator of "Binomial Distribution Table", Gottfried Leibniz (1646-1716) did his dissertation on the subject in 1666; Leibniz you may recall is the co-inventor of "Calculus" and beat Isaac…

829 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question