3 MULTIPLE CHOICE QUESTIONS 1. Circle the correct statement(s): a Calorimeter wi

Question

3 MULTIPLE CHOICE QUESTIONS 1. Circle the correct statement(s): a Calorimeter with reactants and products in condensed phases is a constant pressure b) Calorimeter with reactants and products in condensed phases is a constant volume calorimeter. calorimeter c) Heat flow measured in a constant volume calorimeter is given by AU d) both a) and c) are correct e) both b) and c) are correct. 2. What is/are the least accurate, yet correct, means of numerically determining AHn a) Via Hess's law b) Via Bond enthalpies c) Via Enthalpies of formation AH,-H (product)-H (reactants) d) Via relation Atom = H (bonds formed)-H (bonds broken) e) all are equally accurate f) both a) and c) are correct g) both b) and d) are correct h) a), c), and d) are correct 3. Which of the following represents AU a) heat flow at const. V, reversible work, isothermal process b) heat flow at const. V, irreversible work, isothermal process c) heat flow at const. V, reversible work, adiabatic process d) heat flow at const. V, irreversible work, adiabatic process e) none of the above

Explanation / Answer

Q2

least accurate, but correct on HRxn:

a) Hess law is 100% exact

b) This is innacurate, since it assumes all other interactions between atoms neglegible

c) this is 100% true

d) as stated on b, this is not 100% correct, since it only assumes breaking of bonds

e) false,

therefore, choose b and d only

which is G

since bond enthalpies assume only breaking of atoms

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