UH BTEC 1322 - phase changes (2 pages)

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phase changes



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phase changes

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Brief introduction to chemistry and phase changes.


Lecture number:
1
Pages:
2
Type:
Lecture Note
School:
University of Houston
Course:
Btec 1322 - Introduction to Biotechnology

Unformatted text preview:

BTEC 1332 1nd Edition Lecture 1 Outline of Current Lecture I Introduction to chemistry II Three states of matter in macroscopic and submicroscopic III Phase changes Current Lecture I Chemistry is where we take macroscopic observations and we explain them at the sub microscopic level There are limits with what we can do in chemistry we can get the theory of atoms but they are so small that no one has ever really seen an atom The atomic theory is but a theory and has not been proven II Solid in the macroscopic view has a definite shape and volume Liquid in the macroscopic view has a definite volume but adopts the shape its container Gas in the macroscopic view has no definite volume and takes the shape of its container Solid in the microscopic view the particles are in a regular arrangement with strong attraction as four balls held together by springs Liquid in the microscopic view has a more random arrangement and has an ok attraction as four balls held together by stretchy wire Gas in the microscopic view has a random arrangement with no attraction as just fours balls with no attachment III These states of matter go through phase changes as they are heated or cooled Add Solids heat Balls connected by spring Hotter solid Add particles move heat more quickly Melt s l Add balls have heat stretchy wire Hotter liquid l g balls particles move are free more quickly The first step the equation is q m x c x T m is the specific heat and T is the temperature Step two q Hfus x n where H fus is heat fusion and n is moles Step three q m x cliq x T where c liq is the specific heat of a liquid mass c is the These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute Step four q Hvap x n this step is longer because it takes more time to turn a liquid into gas than a solid to liquid H vap is heat vaporization Step five q m x cgas x T where cgas is the specific heat of gas refer to diagram for



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