{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Lecture 9 Notes - States of Matter Solid Liquid Gas...

Info icon This preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
2/2/2009 1 States of Matter: Solid - Liquid - Gas SOLID GAS LIQUID SUBLIMATION CONDENSATION FREEZING MELTING SUBLIMATION BOILING OR EVAPORATION DEPOSITION XXXXXXXXXXXX Conservation of Energy and Changes of State When heat is: Added to a system q is positive the change is endothermic Removed from a system q is negative the change is exothermic . Water Boils: H 2 O( l ) H 2 O(g) endothermic Steam Condenses: H 2 O(g) H 2 O( l ) exothermic Work occurs as the sample expands or contracts. Overall: Δ E = q + w A liquid cools from 45°C to 30°C, transferring 911 J to the surroundings. No work is done on or by the liquid. What is Δ E liquid ? Δ E liquid = q liquid + w liquid here w liquid = 0 Heat transfers from the liquid to the surroundings: q liquid = 911 J (q surroundings = +911 J) Δ E liquid = 911J Conservation of Energy and Changes of State A system does 50.2 J of work on its surroundings and there is a simultaneous 90.1 J heat transfer from the surroundings to the system. What is Δ E system ?
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern