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...

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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.

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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
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