use 2 or 3 reactions to calculate/predict the enthalpy change of the sum of these reaction Hess's Law TUTORIAL(click on Hess' Law) Time for a reaction in solution (in a calorimeter cup) to determine a more accurate final Temp from the y-intercept. Be able to EXTRAPOLATE a graphs of Temp vs. state INCOMPLETE COMBUSTION as another reason for error in an Enthalpy of Combustion lab

describe the main source of error in calorimetry as the energy transferred to the environment instead of to the water The results of experiments to determine enthalpy changes. use 720 mL of 1.7 M acid and 0.82 L of 2.7 M base to collect data and determine the MOLAR Standard Heat of Neutralization of H2SO4 when neutralized with KOHДetermine the Heat of Solution of two different salts. Calculate the enthalpy of combustion of ethanol in kJ/mol An alcohol burner (37.25 g) burns ethanol as it heats 200g of water from 20 to 75 degrees C. be able to work with Enthalpy of Reaction and Molar Enthalpy of ReactionДў. Enthalpy(Heat) of Formation, where SINGLE atoms combine to form a molecule and release energy Enthalpy(Heat) of Solution where a solute is dissolved in water and causes it to cool or heat up Enthalpy of Combustion reaction where a fuel is combusted to heat water Enthalpy(Heat) of Neutralization reaction of an Acid + Base in water Enthalpy of a Rxn in solution(aq) in a cupД«e able to solve Enthalpy of reaction problems such as: be able to describe and draw a calorimeter set up for :ДЎ. calculate your % error by comparing to the the standard dH of this reactionДescribe an experimental set-up for measuring the heat energy changes of

calculate the dH of this reaction in Joules/mol of reactant. determine how much energy the reactants lost/gained we can use it to calculate how much energy the water LOST or GAINED using Q w=m wc w(dT) w. graph the T change of the water and extrapolate to get the dT Determine the dHsol of a salt and calculate your percent error. Determine the dHneut of HCl + NaOH Neutralization reaction and calculate your % error.Д¬. Calculate the c of a metal and compare with its lit valueД«. UNDERSTAND ENERGY TRANSFER and how experimental data and lit values fit inДЄ. why does it not matter if we use C or K ?

c and mass must be in the same units !Д¬ is typically given in J/gC or J/gK or kJ/gC or kJ/kgK EXPLANATION with SAMPLE PROBLEMS (simple) = (mass of substance being heated or cooled) x (SHC of that substance) x (В change in Temp) specific heat capacity(SHC) c is the amount of energy Q needed to raise 1 g* of a substance by 1 C* be able to use Q=mc dT to solve simple problems of pure substances that are heated or cooled Identify +/- dH, exo- or endothermic, and relative stability of reactants and Make and read Enthalpy Level Diagrams(Enthalpy Profiles). Use this data to calculate the Standard Molar Enthalpy of Combustion of the ethanol.ДЇor exo- and endothermic rxns, know the temperature change and enthalpy change After heating the mass of the burner is recorded again and it reads 14.88 g. The burner heats the water in the calorimeter from 22.0 to 29.5 Celcius. It is burned to heat 80 mL of water in a calorimeter with a Heat Capacity of 8.3 J/K. Sample Problem 1: A spirit burner with ethanol has a mass of 16.45 g. HINT: part of the energy released by the reaction is transferred to the water and some is transferred to the metal calorimeter. Solve this question:Д¬alculate the Standard Molar Enthalpy of Combustion of Methanol. Mini-Lab: Observe a demonstration and take notes on data. using a spirit burner and considering the Specific Heat of a calorimeter compare with a lit valueД¬alculate the enthalpy of neutralization of sulfuric acid in 'kJ / mol of sulfuric acid' using a strong base NaOH or KOH. This is the Enthalpy of Solution of NH4NO3. State this value in 'kJ / mol of NH4NO3'. calculate how much energy 1 mol of NH4NO3 would absorb when it dissolves. assume this is the same Q that the reaction absorbed Qw=QrxnД. use Q=mc dT for water to determine how much energy Q the water transferred.Д¬. write out the 'solution'(dissolving) reaction for this saltД«. Clarification on Standard Enthalpy of Reaction and the Molar RatiosД¬alculate the ENTHALPY OF SOLUTION of NH4NO3 by dissolving a small measured mass of this salt in a sample of room temperature water in a calorimeter cup.ДЄ. 5.1 Intro to Specific Heat Capacity Mini-Lab

Solve born haber cycle problems