WVC PHYS222 Winter 2019 Lab 9.docx - Latent Heats Max Stevens Luke Corbin ABSTRACT The purpose of this lab is to find the amount of energy required for

WVC PHYS222 Winter 2019 Lab 9.docx - Latent Heats Max...

This preview shows page 1 - 3 out of 6 pages.

Latent Heats Max Stevens Luke Corbin 3/6/2019 ABSTRACT: The purpose of this lab is to find the amount of energy required for water to change states. INTRODUCTION: The first concept in this lab is the idea of conservation of energy. No energy is lost. It is only converted into different forms. The next concept is heat of fusion. This is the amount of heat energy required to change water from a liquid to a solid or a solid to a liquid. After this is the concept is heat of vaporization. This is the amount of energy to change water from a liquid to a gas or turn gas to a liquid. These changes of state are called phase changes. Also, latent heat is the name for the amount of energy required for a phase change to occur. The study of changes in state like these is called calorimetry. THEORY: Heat energy, Q is the heat energy transferred into or out of an object, or the change of internal energy, ΔE int . In terms of equations: ¿ Q = Δ E ¿ Eq. 1 The heat energy transferred depends on how much the temperature is changing and how much mass is changing temperature, this can be expressed: Q = mc ΔT Eq. 2 Where m is the mass of the substance, ΔT is the change in temperature, and c is the specific heat, or the amount of energy transferred per unit of mass per unit of change in temperature.
Image of page 1

Subscribe to view the full document.

The first law of thermodynamics is the conservation of energy principle but in the context of heat. In calorimetry, this is expressed with the given equation: Q cold =− Q hot Eq. 3 where Q cold is the heat energy transferred into the cold substance and Q hot is the heat energy transferred from the hot substance. Equation 2 and 3 can be combined and results in: m c c c ΔT c =− m h c h ΔT h Eq. 4 where all symbols subscripted in c are for the cold substance and all items subscripted in h are for the hot substance. ΔT can be expanded: m c c c ( T f T c )= m h c h ( T h T f ) Eq. 5 where T f is the equilibrium temperature that the system eventually reaches. Note that the Q hot side does not need a negative sign because it uses ( T h
Image of page 2
Image of page 3

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

Ask Expert Tutors You can ask 0 bonus questions You can ask 0 questions (0 expire soon) You can ask 0 questions (will expire )
Answers in as fast as 15 minutes