Chemistry Chapter 3 | 1st Year


Chapter 3 Notes | Chemistry 1st Year



  1. States of Matter
  2. Gas Laws
  3. General Gas Equation
  4. Avogadro’s Law
  5. Dalton’s Law of Partial Pressures
  6. Diffusion And Effusion
  7. Kinetic Molecular Theory of Gases
  8. Kinetic Interpretation of Temperature
  9. Liquefaction of Gases
  10. Non-Ideal Behavior of Gases
  11. Plasma State

See Also: Smart Syllabus 2021

Key Points:

  1. The behavior of gas is described through 4 variables i.e. pressure, volume, temperature and its number of moles. The relationships b/w gas variables are know as the simple gas laws. Boyle’s law relates pressure of a gas with its volume, while Charles’s law relates gas volume with temperature. Avogadro’s law is concerned with volume and amount of gas.
  2. By combining the above mentioned three laws, a more general equation about the behavior of gas is obtained PV=nRT.  This equation can be solved for any one of the variables when values of others are known.
  3. Dalton’s law of partial pressure can be used to calculate the partial pressure of gases.
  4. The process of diffusion and effusion are best understood by Graham’s law of diffusion.
  5. Kinetic molecular theory of gases provides a theoretical basis for various gas laws. With the help of this theory a relationship is established b/w average molecular kinetic enegrgy and kelvin temperature.
  6. The real gases show ideal behavior under specific conditions. They become non-ideal at high pressure and low temperature.
  7. Gases can be liquified applying sufficient pressure but temperature should either be critical one or below it.
  8. To calculate the pressure of volume of a real gas under the non-ideal conditions, alternative kinetic equation has been developed. This is known as the van der Waal’s equation.
  9. The plasma, a forth state of mater, consist of neutral particles, positive ions and negative electron, 99% of the known universe is in the plasma state.

See Also: 1st Year Paper Scheme 2021

See Also: 2nd Year Paper Scheme 2021

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  1. sadaf subhani says

    sir kiya ap in notes ka text patteren change kr skty hen plzzz?

  2. danish khan says

    will u please sent me the notes of chemistry of fedral board for fsc part 1

    1. Mudassar says

      sir some pages are missing from this chapter will you please upload this chapter again plz……

      1. Maham Babar says

        Hey Mudassar!
        Thanks for mentioning the problem. We will update these notes.
        Thank You!

  3. noorul haq says

    good site for student progress

  4. zunaira says

    iss ma plasma wala topic toh hy hi nai plz wo b upload kar dyn

    r writng bhi bht negligbel hy

  5. kaleem says

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  6. Umaima. says

    Sir,I think there is a page missing from the notes. Page number 7. Can you please upload that or email it to me, it would be really helpful. Thank you.

  7. iftikhar uddin says

    sir itni kharab writing main Notes ka koi faida ni please writing improve krain .ap ki site main any k baad yea notes dekh kr pharny ko dil he ni krta . Thanks

    1. Amir Shafiq says

      Sorry for this.
      We are working to rewrite our notes.

  8. HamidNadeem says

    sir your hand writing samajh nahi aatee type hwa bohat acha hota hy ye bhi hy but hand writing reply me on my email

    1. Amir Shafiq says

      we are trying to improve the quality of our notes

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