(Photo Courtesy Loupe Clean)
In the previous post, i have discussed on the overview checklist that students need to know about this topic of Particulate Nature of Matter (commonly known as Kinetic Particle Theory).
Besides the “connection between relative molecular mass of a gas & its rate of diffusion” which is listed as very important, students should also know how to describe & differentiate the 3 States of Matter: Solids, Liquids & Gases, with respect to:
- Arrangement of the particles
- Forces between the particles
- Movement of the particles
- Energy of the particles
- Density
Let’s take a look at it now.
|
Comparison
|
Solids |
Liquids |
Gases |
| Arrangement of particles | Closely packed together in an orderly arrangement | Close together in a disorderly arrangement | Far apart in a random arrangement |
| Forces between particles | Strong forces | Strong forces | No forces |
| Movement of particles | Vibrates about their fixed positions | Slide past each other randomly | Move about quickly & randomly |
| Energy of particles | Low | Moderate | High |
| Density | High (bcos particles are close together) | Quite high (bcos particles are close together) | Low (bcos particles are far apart) |
With the above comparisons, we shall now discuss which States of Matter can be compressed upon the application of pressure – something that we learn from parents and junior schools when we are young.
Solids - Not compressible
Reason: Particles are closely packed together and no empty spaces for particles to move in
Liquids - Not compressible
Reason: Particles are closely packed together and no empty spaces for particles to move in
Gases - Compressible
Reason: Particles are very far apart from each other and they are alot of empty spaces for particles to move in, upon the application of any kind of pressure
Hope you have learned something here! I would love to hear from you on how find it. =)
Now, it’s time for you to try out some Chemistry exam-based questions.
Quick Check 1:
Which of them has a fixed volume? Solids, Liquids or Gases? Explain your choices with respect to how their particles are being arranged. (2 marks)
&
Quick Check 2:
Many of Singapore homes as well as eateries and coffee shops are having cylinders in their premises known as LPG (Liquefied Petroleum Gas).
Suggest why large amounts of butane gas, used for cooking, are stored in liquid in cylinders. (1 mark)
PS: You can write your suggested answer below in the Comments Section. We will get back to you soon with our suggested answers.
Quick Check 1:
Which of them has a fixed volume? Solids, Liquids or Gases? Explain your choices with respect to how their particles are being arranged. (2 marks)
Solids have fixed volume. The force of attraction of the particles in the solids are very strong and they are closely packed until they can only vibrate in their fixed position.
Quick Check 2:
Many of Singapore homes as well as eateries and coffee shops are having cylinders in their premises known as LPG (Liquefied Petroleum Gas).
Suggest why large amounts of butane gas, used for cooking, are stored in liquid in cylinders. (1 mark)
When a gas is being compressed, the particles will be closer and thus form liquid under a high pressure. As we can see, a large amount of petroleum gas compressed into a cylinder is definitely saving the spaces and easier to be used.
Reply
sean Reply:
May 5th, 2010 at 11:33 pm
Hi Kerk Yan Juin,
Good attempt.
Quick Check 1:
Solids indeed have fixed volume and i agree with your explanations.
But what about Liquids? Do they have fixed volume? Think about it?
Quick Check 2:
Well Done. Space saving to pack more in the cylinder is indeed the explanation for it.
Keep Learning,
To Your Academic Success in Chemistry,
Sean Chua
Master Trainer & Author
Reply
Kerk Yan Juin Reply:
January 28th, 2012 at 10:42 pm
thanks
Reply
[1] liquid have fixed volumes because they cannot move about their fixed points and are not compressible [2] butane is stored in cylinders so that their will not be any oulet for gas to move out becuase they move randomly
Reply
sean Reply:
May 5th, 2010 at 11:34 pm
Hi Jennifer,
Good Attempt.
I agree with your answer for Quick Check 1.
Refer to above answer for Quick Check 2.
Keep Learning,
To Your Academic Success in Chemistry,
Sean Chua
Master Trainer & Author
Reply