Computer Additivity of Heats of Reaction: Hess’s Law 18 (1) Solid sodium hydroxide dissolves in water to form an aqueous solution of ions. (2) Solid sodium hydroxide reacts with aqueous hydrochloric acid to form water and an aqueous solution of sodium chloride. NaOH(s) + H+(aq) ) + Cl–(aq) → H2O(l) + Na+(aq) + Cl–(aq) ∆H2 = ? OBJECTIVES • • • • In this experiment, you will Combine equations for two reactions to obtain the equation for a third reaction. Use a calorimeter to measure
Experiment Title: Heat of Reactions and Enthalpy Changes Aims: To determine the heat of solution and heat of neutralization Objectives: On completion of this experiment the student should be able to: Identify the definitions of calorimetry, specific heat capacity, heat of reaction, heat of solution and heat of neutralization Calculate the heat of solution and heat of neutralization To test Hess’s law by measuring the enthalpy changes for the same net chemical reaction carried out by two
Chemistry Lab Report: Experiment 6 Experiment name: Calorimetry. ------------------------------------------------- Date of experiment: 22/5/2012 Experiment Summary: The main goal of this experiment is to learn the use of basic thermochemistry rules in order to calculate the change of enthalpy in a reaction. (The last section of this experiment was cancelled due to a malfunction in the bomb calorimeter) Theoretical Background: In bodies the temperature rise in a body as heat energy is transferred
Lab 2: Determine Specific Heat of Substance Sѐnchez Blades, Kayla Meeks, and George Colon-Pena, Tanardjah Washington Tanardjah Washington X: _______________________________________________________________ Date: July 1, 2015 Tanardjah Washington July 6, 2015 Chemistry 1211 L Dr. Song Introduction: The study of measuring the heat change of certain chemical reactions or physical changes is known as calorimetry (Laidler, 1995). A commonly used calorimeter
HEATS OF REACTION Pre-Lab Discussion: The energy involved in a chemical reaction is expressed in terms of the amount of heat released or absorbed during the course of the reaction. The heat of reaction, ( H), is measured in calories per mole. By convention, when H is included as part of the equation for a reaction, it is placed on the product side of an exothermic reaction and on the reactant side of an endothermic reaction. To illustrate, consider the equations for the synthesis (exothermic
Hess's Law Lab Report Purpose Data and Observations Part I Heat of Solution of Solid Sodium Hydroxide Table 1 Original temperature of water (t1) 21.0ºC Final temperature of solution (t2) 26.0ºC Temperature change (t2-t1=∆t) 5.0ºC Mass of 100 mL of water 100.0g Heat evolved by reaction 2092J Mass of NaOH(s) 2.0g Moles of NaOH 0.05001250313 moles Energy per mole of NaOH 41829.52 J/mole ∆ H1 (kJ/mole) NaOH 41.83 kJ/mole Part II Heat of Reaction between Hydrochloric Acid and Sodium
Experi ments in General Chemistry Featuring MeasureNet 2T\ND EDITION Bobby Stanton I Lin Zhu I Charles H. Atwood *.% CENGAGE sh Learning. a 2 ?:!p rt!: R.\' CENGAGE Lea rn i ng' Experiments in General Chemistry: Featuring MeasureNet: 2nd Edition Experiments in General Chemistry: Featuring MeasureNet, 2nd Edition Bobby Stanton I Lin Zhu I Charles H. Atwood O 2010, 2006 Brooks/Cole, Cengage Learning. All rights reserved. Executive Editors: Maureen
Properties of Alpha and Beta Particles............................................................... 21 1-5 Blackbody Radiation...................................................................................................................... 23 1-6 Photoelectric Effect........................................................................................................................ 27 1-7 The Rydberg Equation
THE CUCKOO'S EGG Page 1 of 254 THE CUCKOO'S EGG by Cliff Stoll THE CUCKOO'S EGG Page 2 of 254 Acknowledgments DO YOU SPREAD THE WORD WHEN A COMPUTER HAS A SECURITY HOLE? SOME SAY nothing, fearing that telling people how to mix explosives will encourage them to make bombs. In this book I've explicitly described some of these security problems, realizing that people in black hats are already aware of them. I've tried to reconstruct this incident as I experienced it. My main sources