if have any problem about this topic,just ask here..a.s.a.p,don't let them make you confuse and becomes crazy.ehehehe.PHYSICS is a simple things..just understand the concept
Sachini S3T5 Thank you madam.Just to confirm madam, we don't have to know about the vibration of atoms for the degree of freedom at different temperatures as we can ignore it right?
vibration of molecules : 1)at low temperatures - no vibration in gasses 2) we can consider molecules as atoms on the spring.They are bound by chemical bond but close to equilibrium. This bond behaves very much like a spring. we can initiate vibration by collision with another energetic molecule, but the vibration itself is like a vibration of the spring which it is internal property of the spring. it seem we would exerted force to make the vibration will go on. So for molecules, which have minimum energy so the vibration will not start. that is why we do not consider vibration as degree of freedom
very good. Then check your understanding by doing exercise.click TEST SEMESTER 1 CHP 13..now its time to consolidate your understanding about this concept
mathematical operation needs them in the same unit. if the question didn't mention about SI unit, so you can use both either SI unit or equivalent unit. but my suggestion is make sure all physical quantities are in SI unit to avoid any conflict in your calculation.
1) all gases are made up identical atoms or molecules 2) all atoms or molecules move randomly and haphazardly 3) the volume of atoms is negligible compares with the volume occupied by gas
4) the inter molecular forces are negligible except during collision 5)inter molecular or atomic collision are elastic 6) the duration of a collision is negligible compares with the time spent travelling between collision 7) atoms and molecules move with constant speed between collisions. Gravity has no effect on molecular motion
Perfect!!!very good😍😍😍everyone,make sure you could able to know this before you sleep tonight,okes😜this content should be as multiple choice question in PSPM..compulsory to state all these things okes😍
Sachini S3T5 Hi madam, if I'm not wrong kinetic energy is energy possessed due to the motion of an object and occurs randomly but translational kinetic energy takes count the three direction of translational motion..
kinetic energy is the energy possessed by a body because of its motion while trans kinetic energy is the energy depends on motion through space.. is it true madam?
Fariza S2T1 Average kinetic energy is the sum up of the total kinetic energy of molecules and divide by the number of molecules and we get the kinetic energy for one molecule but the total kinetic energy is the sum up of kinetic energy for all molecules... is it correct,madam?😅
Total kinetic energy is the sum of kinetic energies of all the molecules in substance whereas average kinetic energy is the average of kinetic energies of all the molecules.
state example(degree of feedom) of : 1) monoatomic gas 2)diatomic gas 3)polyatomic gas
very importance to know the type of gas because it is related to degree of freedom.if you master about this you will able to use the correct equation to find average kinetic energy, total kinetic energy and internal energy.
equipartition of energy is the total energy of a gas molecule is equally distributed among all the degrees of freedom.While,the internal energy is the energy contained within the system, excluding the kinetic energy of motion of the system as a whole and the potential energy of the system as a whole due to external force fields..
CONCLUSION: 1) internal energy=total K.E+total P.E(negligible) internal energy=total K.E=(no.of molecules)(average K.E/K.E per molecule) why P.E is negligible in IDEAL GAS?
-vibration of molecules occurs for heavy molecules and at high temperature only -vibration energy -too small values of energy-approaching to zero -weak attractive force-becomes significant only when molecules close each other. at high temperature, kinetic energy of molecules is greater enough to overcome intermolecular attractive force.-weak attractive force(intermolecular force) that is why intermolecular forces between molecules - potential energy are negligible in IDEAL gas.. real gas approching to ideal gas behavior at higher temperature.they are slightly different at high pressure and low temperature.
there are difference between INTERMOLECULAR FORCES & INTRAMOLECULAR FORCES.
AVOID YOUR MISCONCEPTION:refer the concept below (EXTRA KNOWLEDGE) INTERMOLECULAR FORCES : attractive force between molecules-hold multiple molecules together.e.g: HCl-HCl INTRAMOLECULAR FORCES : force that keep the molecule together-keep a molecule intact.e.g H-Cl intermolecular force weak compared to the intramolecular force
2)K.E=translational K.E+Rotational K.E: depends on type of gases(degree of freedom)
3)translational kinetic energy: in straight line only..same for all type of gases=(degree of freedom=3)
tricky question: 1)total translational kinetic energy=total average K.E=N(average K.E)=N(K.E/molecule) 2)average K.E=K.E for a molecule=K.E/molecule
also can watch these videos :
ReplyDeleteDiana s3t5
https://drive.google.com/open?id=12HfJYyEvdSJkNtkLsIcA_IsDZvunbJz4
https://drive.google.com/open?id=12axj04hJi_Z4uqH7BZzRx-yRH8VLM2C1
Thank you madam..
ReplyDeleteif have any problem about this topic,just ask here..a.s.a.p,don't let them make you confuse and becomes crazy.ehehehe.PHYSICS is a simple things..just understand the concept
DeleteSachini S3T5
DeleteThank you madam.Just to confirm madam, we don't have to know about the vibration of atoms for the degree of freedom at different temperatures as we can ignore it right?
We neglect the vibration because the molecules have less vibration at low temperature.
DeleteOoo ok thank you madam..
DeleteThe discussion is about ideal gas not real gas.we just focused on parameters involved based on ideal gass assumption..
Deletevibration of molecules :
Delete1)at low temperatures - no vibration in gasses
2) we can consider molecules as atoms on the spring.They are bound by chemical bond but close to equilibrium. This bond behaves very much like a spring. we can initiate vibration by collision with another energetic molecule, but the vibration itself is like a vibration of the spring which it is internal property of the spring. it seem we would exerted force to make the vibration will go on. So for molecules, which have minimum energy so the vibration will not start.
that is why we do not consider vibration as degree of freedom
but it could be different when the temperature is extremely high
DeleteDiana S3T5
ReplyDeleteThank you madam saya faham dah chap ni
Very good..
DeletePrissha S3T5
ReplyDeleteThank you madam.Able to understand well
You are welcome
Deletenabilah S3T5
ReplyDeletebole madam share soalan2 yang berkaitan dgn degree of freedom?
Intan S3T5
ReplyDeleteThank you madam for sharing info about this chapter.
😃
DeleteThis comment has been removed by the author.
ReplyDeleteHanis S3T5
ReplyDeleteThank you madam..boleh x madam share contoh2 soalan yg slalu ditanya dlm exam utk tajuk ini.😄
click TEST SEMESTER 1
DeleteSyakinah S3T5
ReplyDeleteTq madam i am able to understand this subtopic better after watching the video
😃
DeleteSyazleen S3T5
ReplyDeleteThank you madam for sharing this video
😃
Deletethank you madam. good teaching skills and easy to understand.
ReplyDeleteputeri S3T5
Delete😃
Delete😃
DeleteAthirah S3T5
ReplyDeleteThank you for the info madam. Able to understand better after watching the video
😃
DeleteAzera S3T5
ReplyDeleteThank you madam, through this video i can understand this subtopic well ..
😃
DeleteMun S3T5.
ReplyDeleteTq madam. Tapi kan, boleh ke guna formula K=(1/2)mv^2 instead of K=(f/2)kT for translational??????
Uhukss..confuse
Actually can use both equations..but in this chapter,we focused on the effect on the kinetic energy due to Temperature and degree of freedom..
DeleteOk..tq madam😊
DeleteSyuhada S3T5
ReplyDeleteThank you Madam.. This video is very helpful for me to understand this subtopic better..
😃
DeleteShanthiraa S3at5
ReplyDeleteThank you madam..i can understand well after watching the video
😃
DeleteChing Jia Ying S3T5
ReplyDeleteThank you madam, I've understand more on this topic~
very good. Then check your understanding by doing exercise.click TEST SEMESTER 1 CHP 13..now its time to consolidate your understanding about this concept
Deletefatah S3T5
ReplyDeleteim little bit confused wheter we nees to change all the unit to SI unit???
mathematical operation needs them in the same unit. if the question didn't mention about SI unit, so you can use both either SI unit or equivalent unit. but my suggestion is make sure all physical quantities are in SI unit to avoid any conflict in your calculation.
DeleteThis comment has been removed by a blog administrator.
ReplyDeleteThanks madam for sharing this topic 😊 alia F3T3
ReplyDeleteKeywords for assumption of ideal gas:
ReplyDelete1)build up
2)motion
3)volume
4)collision
5)type of collision
6)force
7)time
8)gravity
Explain these breifly...i'm waiting for your answer😍😍😍
1) all gases are made up identical atoms or molecules
Delete2) all atoms or molecules move randomly and haphazardly
3) the volume of atoms is negligible compares with the volume occupied by gas
4) the inter molecular forces are negligible except during collision
Delete5)inter molecular or atomic collision are elastic
6) the duration of a collision is negligible compares with the time spent travelling between collision
7) atoms and molecules move with constant speed between collisions. Gravity has no effect on molecular motion
Perfect!!!very good😍😍😍everyone,make sure you could able to know this before you sleep tonight,okes😜this content should be as multiple choice question in PSPM..compulsory to state all these things okes😍
DeleteWhat is the difference between KINETIC ENERGY and TRANSLATIONAL KINETIC ENERGY for gases?
ReplyDeleteReminder:introduce yourself e.g name and cls
Sachini S3T5
DeleteHi madam, if I'm not wrong kinetic energy is energy possessed due to the motion of an object and occurs randomly but translational kinetic energy takes count the three direction of translational motion..
syafiqah S2T1
Deletekinetic energy is the energy possessed by a body because of its motion while trans kinetic energy is the energy depends on motion through space.. is it true madam?
Aiman f3t3
ReplyDeleteKinetic energy is the energy of an object that has motion while translational kinetic energy is the energy due to motion from one location to another.
This comment has been removed by the author.
ReplyDeleteTypo: diraction=direction
ReplyDeleteConclusion:
ReplyDelete1)Average kinetic energy-must consider all degree of freedom (translational+rotational)-different for all type of gases
2)translational kinetic energy-must consider degree of freedom for translational only(f=3 same for all type of gases)
What is the difference between average kinetic energy and total kinetic energy?
ReplyDeleteFariza S2T1
DeleteAverage kinetic energy is the sum up of the total kinetic energy of molecules and divide by the number of molecules and we get the kinetic energy for one molecule but the total kinetic energy is the sum up of kinetic energy for all molecules... is it correct,madam?😅
Ainaa S2T1
DeleteTotal kinetic energy is the sum of kinetic energies of all the molecules in substance whereas average kinetic energy is the average of kinetic energies of all the molecules.
good try aina..refer to fariza's answer..exactly, fariza..very good..means that calculation for total kinetic energy:
ReplyDeletetotal K.E=N(average K.E)
state example(degree of feedom) of :
ReplyDelete1) monoatomic gas
2)diatomic gas
3)polyatomic gas
very importance to know the type of gas because it is related to degree of freedom.if you master about this you will able to use the correct equation to find average kinetic energy, total kinetic energy and internal energy.
nabilah s3t5
Deleteex monoatomic gas - He , Ne &Ar
diatomic gas - H2,O2&N2
polyatomic- H20,CO2 & NH3
Very good nabilah..👍🤩
Delete1)what means by equipartition of energy?
ReplyDelete2)what means by internal energy?
athirah S3T5
Delete1) Equipartition of energy is the average kinetic energy of every degree of freedom of a molecule which is 1/2kT.
2) Internal energy is the sum of total kinetic energy and total potential energy of the gas molecule.
👍💯🤩
DeleteSyam S3T5
ReplyDeleteequipartition of energy is the total energy of a gas molecule is equally distributed among all the degrees of freedom.While,the internal energy is the energy contained within the system, excluding the kinetic energy of motion of the system as a whole and the potential energy of the system as a whole due to external force fields..
Correct..but i was detect a mistake about last sentence..not excluding but including..U
DeleteCONCLUSION:
U=K+P.E
How is about potential energy?i it we consider as energy of the gas for ideal gas?
ReplyDeleteIs it we consider potential energy for ideal gas?
ReplyDeleteAiman f3t3
DeleteThe intermolecular forces are assumed to be negligible thus the potential energy of the molecules can be neglected
👍💯🤩very good aiman..means that internal energy =total K.E
DeleteThe assumption👆valid for ideal gas only not for real gas
DeleteThis comment has been removed by the author.
ReplyDeleteCONCLUSION:
ReplyDelete1) internal energy=total K.E+total P.E(negligible)
internal energy=total K.E=(no.of molecules)(average K.E/K.E per molecule)
why P.E is negligible in IDEAL GAS?
-vibration of molecules occurs for heavy molecules and at high temperature only
-vibration energy -too small values of energy-approaching to zero
-weak attractive force-becomes significant only when molecules close each other.
at high temperature, kinetic energy of molecules is greater enough to overcome intermolecular attractive force.-weak attractive force(intermolecular force)
that is why intermolecular forces between molecules - potential energy are negligible in IDEAL gas..
real gas approching to ideal gas behavior at higher temperature.they are slightly different at high pressure and low temperature.
there are difference between INTERMOLECULAR FORCES & INTRAMOLECULAR FORCES.
AVOID YOUR MISCONCEPTION:refer the concept below (EXTRA KNOWLEDGE)
INTERMOLECULAR FORCES : attractive force between molecules-hold multiple molecules together.e.g: HCl-HCl
INTRAMOLECULAR FORCES : force that keep the molecule together-keep a molecule intact.e.g H-Cl
intermolecular force weak compared to the intramolecular force
2)K.E=translational K.E+Rotational K.E: depends on type of gases(degree of freedom)
3)translational kinetic energy: in straight line only..same for all type of gases=(degree of freedom=3)
tricky question:
1)total translational kinetic energy=total average K.E=N(average K.E)=N(K.E/molecule)
2)average K.E=K.E for a molecule=K.E/molecule