Energy: Applications & Uses II Lowersixth Science Chemistry

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Test enthalpy concepts and Hess's law.

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YAKILI LMS

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Energy: Applications & Uses II Lowersixth Science Chemistry


Froggy Jumps Energy: Applications & Uses II Lowersixth Science ChemistryOnline version Test enthalpy concepts and Hess's law. by YAKILI LMS 1 What is enthalpy change, ΔH, measured as in a reaction? a Work done by system b Internal energy change only c Heat transferred at constant pressure 2 Which sign indicates an endothermic reaction? a ΔS is zero b ΔH is positive c ΔH is negative 3 What is the standard state for enthalpy formation data? a 1 bar and 25°C b 1 atm and 0°C c 2 bar and 100°C 4 Standard enthalpy of formation refers to formation from what? a Ions in gas phase b Elements in their standard states c Compounds in solution 5 Hess's Law states that enthalpy is what kind of function? a Only volume dependent b Path independent c Path dependent 6 Which equation best expresses Hess's Law for two steps? a ΔH_total = ΔH1 + ΔH2 b ΔH_total = ΔG1 - ΔG2 c ΔH_total = ΔS1 + ΔS2 7 What does indirect determination of enthalpy involve? a Using known enthalpies to find unknown b Measuring entropy directly c Direct calorimetry only 8 What is calorimetry used to measure? a Pressure change b Heat change c Volume change 9 Standard enthalpy of formation of O2(g) is? a -10 kJ/mol b +10 kJ/mol c Zero 10 If ΔHrxn is negative, the reaction is? a Isothermal b Exothermic c Endothermic 11 Which quantity is enthalpy primarily derived from? a Entropy change b Internal energy only c Enclosed heat at constant pressure 12 What is the standard enthalpy of formation of NaCl(s)? a Purely positive value b Zero c A known negative value 13 What does a enthalpy diagram show? a Energy changes during a reaction b Volume changes c Reaction rate 14 Which process has ΔH = 0 by formation of a element in standard state? a Combustion of methane b Formation of O2(g) from elements c Dissolution of salt 15 What is Hess's Law useful for? a Predicting pH b Calculating unknown enthalpies c Determining rate constants 16 Which is a method to determine enthalpy change experimentally? a Chromatography b Titration c Calorimetry 17 What is the unit for standard enthalpy of formation? a kJ/mol b kJ c J/mol 18 Enthalpy change for bond formation is generally? a Exothermic b Endothermic c Zero 19 Which statement describes exothermic dissolution? a ΔH < 0 b ΔH = 0 c ΔH > 0 20 Which data gives the enthalpy of combustion? a ΔHf b ΔHvap c ΔHc 21 Which is true about Hess's Law applicability? a Works for any path between states b Only for one-step reactions c Only for gas phase 22 Standard enthalpy of reaction is derived from? a Sum of ΔS b Sum of ΔHf products minus reactants c Sum of ΔG 23 Heat capacity at constant pressure is related to which term? a R b Cp c Cv 24 What does ΔH°rxn depend on in standard state? a Only 1 atm b Temperatures 25°C and 1 bar c Any temperature 25 Which device measures heat evolved in reactions? a Calorimeter b Barometer c Thermocouple 26 What is the sign of ΔH when bonds break? a Negative b Positive c Zero 27 What is Hess's Law primarily about? a Color change b Energy conservation across routes c Rate laws 28 Which enthalpy is used to compare fuels? a Enthalpy of vaporization b Enthalpy of combustion c Enthalpy of fusion 29 Enthalpy change that makes solutions warmer is? a Endothermic b Isothermal c Exothermic 30 What does enthalpy formation data help predict? a Acidity b Stability of compounds c Color 31 Which condition is constant in ΔH measurements? a Pressure b Temperature c Volume 32 If ΔHrxn = 0, the reaction is? a Isoenthalpic b Endothermic c Exothermic 33 Which is not a standard enthalpy concept? a Standard enthalpy of formation b Hess's Law c Standard entropy change 34 What describes the energy change of a reaction pathway? a Gibbs is additive b Enthalpy is additive c Entropy is additive 35 Which represents the enthalpy of reaction from data tables? a ΔHrxn = ΣΔHf(products) − ΣΔHf(reactants) b ΔHrxn = ΣΔHfus(products) c ΔHrxn = ΣΔHf(reactants) − ΣΔHf(products) 36 Which state change is endothermic? a Condensing steam b Melting ice c Freezing water 37 What unit is used for enthalpy data in tables? a J b J/mol c kJ/mol 38 Which is a typical application of Hess's Law? a Calculating enthalpy when direct data is unavailable b Predicting reaction rate c Measuring pH 39 Standard enthalpy of formation for H2(g) is? a Zero b +20 kJ/mol c -20 kJ/mol 40 What does a negative ΔHf imply for a compound? a Formation requires energy b Formation releases energy c No energy change 41 Which phase change has positive ΔH? a Condensation b Freezing c Vaporization 42 In a calorimeter, heat gained equals heat a Produced by catalyst b Lost by the other substance c Created by instrument 43 Which represents an exothermic formation process? a Dissolution of salt in water b Vaporization of water c Formation of water from H2 and O2 44 Hess's Law allows enthalpy calculations using? a Multiple steps b Only single-step c Only gas-phase data 45 What does ΔHf°(O2, g) equal in standard state? a Zero b -50 kJ/mol c +50 kJ/mol 46 What is the enthalpy change at constant pressure? a Gibbs free energy change b Internal energy change c Heat absorbed or released 47 How is enthalpy typically determined experimentally? a Observing color change only b Measuring pressure alone c Measuring temperature and heat flow in a calorimeter 48 Hess's law states that enthalpy change is what? a Path-independent and equals the sum of steps b Depends on the path c Always zero for formation reactions 49 One application of Hess's law is to: a Always use direct measurement only b Ignore enthalpy changes in steps c Compute reaction enthalpy from known formation/combustion heats 50 Standard enthalpy of formation is the enthalpy change when 1 mole of a compound forms from: a Ions in solution b Elements in their standard states c Pure compounds in any state

Energy: Applications & Uses II Lowersixth Science Chemistry

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Energy: Applications & Uses II Lowersixth Science ChemistryOnline version

by YAKILI LMS

What is enthalpy change, ΔH, measured as in a reaction?

Which sign indicates an endothermic reaction?

What is the standard state for enthalpy formation data?

Standard enthalpy of formation refers to formation from what?

Hess's Law states that enthalpy is what kind of function?

Which equation best expresses Hess's Law for two steps?

What does indirect determination of enthalpy involve?

What is calorimetry used to measure?

Standard enthalpy of formation of O2(g) is?

If ΔHrxn is negative, the reaction is?

Which quantity is enthalpy primarily derived from?

What is the standard enthalpy of formation of NaCl(s)?

What does a enthalpy diagram show?

Which process has ΔH = 0 by formation of a element in standard state?

What is Hess's Law useful for?

Which is a method to determine enthalpy change experimentally?

What is the unit for standard enthalpy of formation?

Enthalpy change for bond formation is generally?

Which statement describes exothermic dissolution?

Which data gives the enthalpy of combustion?

Which is true about Hess's Law applicability?

Standard enthalpy of reaction is derived from?

Heat capacity at constant pressure is related to which term?

What does ΔH°rxn depend on in standard state?

Which device measures heat evolved in reactions?

What is the sign of ΔH when bonds break?

What is Hess's Law primarily about?

Which enthalpy is used to compare fuels?

Enthalpy change that makes solutions warmer is?

What does enthalpy formation data help predict?

Which condition is constant in ΔH measurements?

If ΔHrxn = 0, the reaction is?

Which is not a standard enthalpy concept?

What describes the energy change of a reaction pathway?

Which represents the enthalpy of reaction from data tables?

Which state change is endothermic?

What unit is used for enthalpy data in tables?

Which is a typical application of Hess's Law?

Standard enthalpy of formation for H2(g) is?

What does a negative ΔHf imply for a compound?

Which phase change has positive ΔH?

In a calorimeter, heat gained equals heat

Which represents an exothermic formation process?

Hess's Law allows enthalpy calculations using?

What does ΔHf°(O2, g) equal in standard state?

What is the enthalpy change at constant pressure?

How is enthalpy typically determined experimentally?

Hess's law states that enthalpy change is what?

One application of Hess's law is to:

Standard enthalpy of formation is the enthalpy change when 1 mole of a compound forms from: