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870 quizzes
Acetone, the solvent in nail polish remover, boils at 329 K. Its enthalpy of vaporisation is 29.1 kJ/mol. What is its entropy of vaporisation? New
High School (11–12) · Entropy, Gibbs Energy and Spontaneity
Board Exam, AP, A-Level, IB
StemPy LabStemPy Lab
Easy
On a cold morning, Meera sees water vapour turn to droplets on a window. Which other change has the same sign of Δ S? New
High School (11–12) · Entropy, Gibbs Energy and Spontaneity
Board Exam, AP, A-Level, IB
StemPy LabStemPy Lab
Easy
Ice cubes melt in a glass of juice at room temperature, although melting takes in heat. Why is the melting spontaneous? New
High School (11–12) · Entropy, Gibbs Energy and Spontaneity
Board Exam, AP, A-Level, IB
StemPy LabStemPy Lab
Medium
A reaction in the body has Δ H = -45 kJ/mol and Δ S = -130 J/(K mol). What is Δ G at body temperature, 37 °C? New
High School (11–12) · Entropy, Gibbs Energy and Spontaneity
Board Exam, AP, A-Level, IB
StemPy LabStemPy Lab
Medium
Dev studies a change with Δ H > 0 and Δ S > 0. When is it spontaneous? New
High School (11–12) · Entropy, Gibbs Energy and Spontaneity
Board Exam, AP, A-Level, IB
StemPy LabStemPy Lab
Easy
A salt dissolves with Δ H = +31 kJ/mol and Δ S = +97 J/(K mol). Above what temperature does it dissolve spontaneously? New
High School (11–12) · Entropy, Gibbs Energy and Spontaneity
Board Exam, AP, A-Level, IB
StemPy LabStemPy Lab
Medium
For a change in a closed flask, Anu finds Δ G = 0. What does this tell her? New
High School (11–12) · Entropy, Gibbs Energy and Spontaneity
Board Exam, AP, A-Level, IB
StemPy LabStemPy Lab
Easy
Kiran finds that, for one isomer turning into another in solution, Δ G° is exactly zero. Which value of the equilibrium constant goes with that? New
High School (11–12) · Entropy, Gibbs Energy and Spontaneity
Board Exam, AP, A-Level, IB
StemPy LabStemPy Lab
Easy
A reaction has Δ G° = +20 kJ/mol at 25 °C. What does the equilibrium mixture contain? New
High School (11–12) · Entropy, Gibbs Energy and Spontaneity
Board Exam, AP, A-Level, IB
StemPy LabStemPy Lab
Medium
Isha looks up an isomerisation in a data book: its standard Gibbs energy change at 25 °C is -8.56 kJ/mol. Find the common logarithm of its equilibrium constant. New
High School (11–12) · Entropy, Gibbs Energy and Spontaneity
Board Exam, AP, A-Level, IB
StemPy LabStemPy Lab
Medium
Two identical beakers of water at 40 °C are poured into one jug. Which quantity is the same for the jug as for one beaker? New
High School (11–12) · Enthalpy and Hess's Law
Board Exam
StemPy LabStemPy Lab
Easy
A sample burns inside a sealed steel bomb immersed in water. The heat taken up by the water gives which quantity for the reaction? New
High School (11–12) · Enthalpy and Hess's Law
Board Exam
StemPy LabStemPy Lab
Easy
For N₂(g) + 3H₂(g) → 2NH₃(g) at 550 K, what is Δ H - Δ U? Take R = 8.3 J K⁻¹mol⁻¹. New
High School (11–12) · Enthalpy and Hess's Law
Board Exam
StemPy LabStemPy Lab
Medium
Dissolving some calcium chloride makes 90.0 g of solution in a foam cup get hotter by 2.5 K. If its specific heat capacity is 4.2 J g⁻¹K⁻¹, what heat did the solution absorb? New
High School (11–12) · Enthalpy and Hess's Law
Board Exam, AP, A-Level, IB
StemPy LabStemPy Lab
Easy
Which of these has a standard enthalpy of formation of zero? New
High School (11–12) · Enthalpy and Hess's Law
Board Exam, AP, A-Level, IB
StemPy LabStemPy Lab
Easy
Given Δf H° of C₂H₄(g) = +52.3 kJ/mol and of C₂H₆(g) = -84.7 kJ/mol, find Δr H° for C₂H₄(g) + H₂(g) → C₂H₆(g). New
High School (11–12) · Enthalpy and Hess's Law
Board Exam, AP, A-Level, IB
StemPy LabStemPy Lab
Medium
Splitting one mole of a gas X₂ into two moles of X takes in 63.5 kJ. Four moles of X now pair up into X₂. What is Δ H for this change? New
High School (11–12) · Enthalpy and Hess's Law
Board Exam, AP, A-Level, IB
StemPy LabStemPy Lab
Medium
Which kind of standard enthalpy change is always negative? New
High School (11–12) · Enthalpy and Hess's Law
Board Exam, AP, A-Level, IB
StemPy LabStemPy Lab
Easy
For KCl, the lattice enthalpy is +717 kJ/mol and the hydration enthalpy of its ions is -699 kJ/mol. What happens when KCl dissolves in water? New
High School (11–12) · Enthalpy and Hess's Law
Board Exam, A-Level, IB
StemPy LabStemPy Lab
Medium
Why is the enthalpy of vaporisation of a liquid much larger than its enthalpy of fusion? New
High School (11–12) · Enthalpy and Hess's Law
Board Exam, AP, A-Level, IB
StemPy LabStemPy Lab
Hard
A sealed steel bomb with thick walls holds a fuel and oxygen. It sits in a water bath while the fuel burns. Treated as the system, the bomb is New
High School (11–12) · Systems, Work, Heat and the First Law
Board Exam
StemPy LabStemPy Lab
Easy
Which list holds only state functions? New
High School (11–12) · Systems, Work, Heat and the First Law
Board Exam, IB
StemPy LabStemPy Lab
Easy
Which of these properties is intensive? New
High School (11–12) · Systems, Work, Heat and the First Law
Board Exam
StemPy LabStemPy Lab
Easy
A refrigerant gas absorbs 85 J of heat while it is compressed by 75 J of work. What is Δ U? New
High School (11–12) · Systems, Work, Heat and the First Law
Board Exam, AP, A-Level, IB
StemPy LabStemPy Lab
Easy
A balloon of gas cools, giving out 64 J of heat, while the air outside squeezes it with 28 J of work. What is Δ U for the gas? New
High School (11–12) · Systems, Work, Heat and the First Law
Board Exam, AP, A-Level, IB
StemPy LabStemPy Lab
Medium
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