Thermochemistry MCQs

1.Which branch of science focuses on the energy changes within a chemical system?

ThermochemistryThermodynamicsChemical kineticsStoichiometry

2.What is the standard SI unit used to measure heat?

JouleKilocalorieCalorieGigajoule

3.What constitutes the total energy of a system?

Potential energy plus kinetic energyPotential energy combined with thermal energyKinetic energy along with thermal energyPotential energy added to mechanical energy

4.What type of reaction occurs when CuSO4 reacts with Zn to form ZnSO4 and Cu?

A reaction that occurs spontaneouslyA reaction that does not occur on its ownA reaction that absorbs heatA reaction that releases heatNone of the above

5.A state function is a macroscopic property of a system that depends on which of the following?

6.If the enthalpy of the reactants exceeds that of the products, what type of reaction occurs?

7.Which device is used to precisely determine the enthalpy of combustion for food fuels and various substances?

8.How can the change in enthalpy be determined?

9.What are the two primary methods by which energy can be transferred?

pressure and temperaturepressure and volumework and heatheat and volume

10.Which category do the majority of thermodynamic properties belong to?

11.Which instrument is used to determine the enthalpy change of a chemical reaction?

glass calorimetermanometerbarometerthermometer

12.Identify the option that represents a state function from the following:

13.What type of process is involved when water is pumped uphill?

A spontaneous processA process that does not occur naturallyA process that cannot be reversedA process that can be reversed

14.What is the term for a chemical reaction that releases heat?

15.What term describes a property that relies solely on the initial and final conditions of a system?

16.What term describes the external setting in which a system is analyzed?

17.If a reaction has both positive enthalpy change (ΔH) and positive entropy change (ΔS), what can be said about the spontaneity of the reaction?

The reaction proceeds spontaneouslySpontaneity depends on the temperatureThe reaction's Gibbs free energy increasesThe reaction is not spontaneousThe reaction is at equilibrium

18.What can occur when the internal energy of a system increases?

The system's phase change becomes more pronouncedThe temperature of the system might increaseA chemical reaction could be initiatedAll of the above

19.Identify the quantity that does not qualify as a state function:

Internal energyEnthalpyGibbs free energyWork