91 Created by Kamran FatehThermodynamics and Thermochemistry Quiz Batch 07Thermodynamics studies energy, heat, and work, focusing on their transformations in physical and chemical processes. Thermochemistry deals with heat changes in chemical reactions, determining whether they are exothermic or endothermic. 1 / 27Entropy (S) is a measure of: a) Heat content b) Disorder c) Enthalpy d) Work done 2 / 27IfΔG∘=−RTlnK, andK=1, thenΔG∘is: Zero Positive Negative Undefined 3 / 27Which of the following is NOT part of the surroundings? a) The reaction flask b) The air outside the flask c) The reactants d) The table holding the flask 4 / 27Enthalpy (H) is defined as: a) The heat content of a substance b) The work done by a system c) The entropy of a system d) The internal energy of a system 5 / 27The first law of thermodynamics states: a) Entropy always increases b) Energy cannot be created or destroyed c) Absolute zero cannot be achieved d) Gibbs free energy determines spontaneity 6 / 27The second law of thermodynamics states a) Energy is conserved b) Entropy of the universe always increases c) Enthalpy is a state function d) Work is path-dependent 7 / 27In a bomb calorimeter, the heat transfer is measured under: a) Constant volume b) Constant pressure c) Variable temperature d) Variable pressure 8 / 27What does thermodynamics study? a) Speed of reactions b) Interrelation of heat, work, energy, and entropy c) Molecular structures d) Atomic masses 9 / 27Which phase change is endothermic? a) Freezing b) Condensation c) Melting d) Deposition 10 / 27State functions depend on: a) The pathway of the process b) Initial and final states only c) Temperature and pressure d) Volume changes 11 / 27Which term is NOT a state function? a) Enthalpy (H) b) Entropy (S) c) Heat (q) d) Internal energy (E) 12 / 27Hess’s Law states that: a) Enthalpy is a state function b) The enthalpy change of a reaction is the sum of the enthalpy changes of individual steps c) Entropy always increases d) Gibbs free energy determines spontaneity 13 / 27Which state of matter has the highest entropy? a) Solid b) Liquid c) Gas d) Plasma 14 / 27For a reaction withΔH<0andΔS>0, the reaction is: a) Spontaneous at all temperatures b) Spontaneous only at high temperatures c) Spontaneous only at low temperatures d) Nonspontaneous at all temperatures 15 / 27The phase change from solid to gas is called: a) Sublimation b) Deposition c) Vaporization d) Fusion 16 / 27IfK>1, thenΔG∘is: a) Positive b) Negative c) Zero d) Cannot be determined 17 / 27The specific heat of water is: a) 2.05 J/g°C b) 4.18 J/g°C c) 0.90 J/g°C d) 1.00 J/g°C 18 / 27The heat of fusion is the energy required for: a) Solid to liquid b) Liquid to gas c) Gas to solid d) Liquid to solid 19 / 27A reaction is spontaneous if: a) Δ G > 0 b) Δ G < 0 c) Δ G = 0 d) Δ H = 0 20 / 27Hess’s Law is used to: a) Calculate Δ H for a reaction using multiple steps b) Measure entropy c) Determine Gibbs free energy d) Calculate heat capacity 21 / 27The Gibbs free energy equation is: a) Δ G = Δ H + T Δ S b) Δ G = Δ H − T Δ S c) Δ G = Δ S − T Δ H d) Δ G = Δ H / T Δ S 22 / 27For a reaction withΔS>0: a) The system becomes more ordered b) The system becomes more disordered c) The enthalpy decreases d) The Gibbs free energy increases 23 / 27The units of entropy are: a) J/K b) kJ/mol c) J/g°C d) cal/°C 24 / 27The equationΔE=q+wrepresents: a) The second law of thermodynamics b) The first law of thermodynamics c) Gibbs free energy d) Entropy change 25 / 27The phase change from gas to solid is called: a) Sublimation b) Deposition c) Condensation d) Freezing 26 / 27The third law of thermodynamics states: a) Entropy of a perfect crystal at 0 K is zero b) Energy is conserved c) Enthalpy is path-independent d) Gibbs free energy must be negative 27 / 27The bond enthalpy is the energy required to: a) Break a bond b) Form a bond c) Measure entropy d) Calculate Gibbs free energy Your score isThe average score is 69% 0% Restart quiz
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