The following headers are meant as a guide to the sections that you need in your module. Here, before the table of contents, give a two-four sentence overview of the Module. Be straight to the point. No examples and no figures in this section. Keep the following text for automatic table of contents based on the headings below (seen in edit mode only).
Calorimetry is the measurement of heat associated with either a chemical reaction or physical process. Measuring the heat change means that you can tell how much heat is being absorbed and released in or from the system. Measuring the temperature before and after the process is a way to determine the heat change which can be used to find the amount of energy lost or energy gained. Constant-Volume and Constant-Pressure are the two main types of calorimetry. The tool used to make this measurement is called a calorimeter.
The first law of Thermodynamics is useful to know since it can be used to calculate heat flowing in and out of a system which is displayed below
where ΔU is the internal energy change of the system, q is heat and w is work. Positive q is heat flowing into the system and positive w is work done on the system.
q can be calculated using the heat capacity of the calorimeter, the heat required to change the temperature by one degree, in cal/K.
where C is the heat capacity.
Enthalpy, the total heat content, can also be calculated using calorimetry which is displayed below
where ΔH is enthalpy and W is work done on the system. Calculating the heat capacity of the calorimeter can be used to find the change of internal energy and change in enthalpy.
Constant - Pressure Calorimetry
Constant Pressure calorimetry means that all variables can change except the pressure of the system. A solution calorimeter is a popular tool of measuring the constant pressure release in the liquid phase. To find the change in enthalpy, ΔH can be found knowing the heat capacity of the calorimeter, C, and the change of temperature of the system. Since the pressure of a solution calorimeter is constant, the equation to find the heat q, can be rewritten as
∆H = (-C∆T)/n
where n is the number of moles.
A system that can be used for solution calorimetry are two Styrofoam cups which keep the two liquids that are added, insulated. A diagram of the system is displayed below.
Be careful not to copy from existing textbooks. Originality is rewarded. Make up some practice problems for the future readers. Five original with varying difficulty questions (and answers) are ideal.