CHEM120L Study Guide - Final Guide: Sodium Hydroxide, Pearson Education, Reagent

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raspberrygoose410

3 Apr 2013

School

University of Waterloo

Department

Chemistry

Course

CHEM120L

Professor

Sue Stathopulos

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Document Summary

The purpose of this experiment is to determine the molar enthalpy of neutralization, and calculate the unknown concentration of the hcl. Changes in energy are always associated with chemical reactions. (clancy et at. , 2011). If energy is liberated in the form of heat the reaction is said to be exothermic. (reece, 2011). If energy is absorbed, it is endothermic. (reece, 2011). Thermochemistry is the branch of chemistry which deals with the gain or loss of heat. (clancy et at. , 2011). A calorimeter is used to measure these changes in heat. (clancy et at. , 2011). It is an insulated container, in which a reaction can occur and the temperature can be measured. (clancy et at. , 2011). A simple coffee cup calorimeter is used in this experiment. The coffee cup is not a sealed system, and therefore the internal pressure is the same as the atmospheric pressure. (clancy et at. , 2011).

Related Questions

Calorimetry is a method used to measure changes inenthalpy, or heat, that occur during chemical processes. Two commoncalorimeters are constant-pressure calorimeters and constant-volume(or "bomb") calorimeters. Bomb calorimeters are used to measurecombustion and other gas-producing reactions, in which the reactionis observed in a strong, sealed vessel. A simple constant-pressurecalorimeter can be made from a foam coffee cup and a thermometer,in which energy changes in a reaction are observed via the changein temperature of the solution in the cup. The idea behindcalorimeters is that if they are sufficiently insulated from theoutside environment, any energy gained or lost in the chemicalreaction will be directly observable as a temperature and/orpressure change in the calorimeter.