Calorimetry

Some Definitions

n System: A set of objects under consideration

n Open System: Mass and energy may enter or leave the system

n Closed System: No mass enters or leaves but energy may be exchanged with the environment

n Isolated System: No energy in any form passes the boundaries. Neither mass nor energy can enter or exit; they can only move around inside

n Calorimetry:  The quantitative measurement of heat exchange.

n Calorimeter: Instrument used to measure heat exchange. A simple water calorimeter is shown below.

n Bomb Calorimeter: Used to measure the thermal energy released when a substance burns.

An instrument which measures the heat released or absorbed during a chemical reaction - diagram shown on the right It is used for determining the potential energy of organic substances, including those in foods. It consists of a hollow steel container, lined with platinum and filled with pure oxygen, into which a weighed quantity of substance is placed and ignited with an electric fuse. The heat produced is absorbed by water surrounding the bomb and, from the rise in temperature, the calories liberated are calculated.

An Example

What is the final temperature at equilibrium? Conservation of Energy: Heat Loss = Heat Gained (assume isolated) mteactea(95 - Tcommon) = mcupccup(Tcommon - 25) Solve for T
	Cup Cools the Tea