Chapter 8: Energetics

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1. Calorimeter is used to measure:

A Temperature only

B Heat of reaction

C Pressure change

D Volume change

2. Which process is exothermic?

A Evaporation

B Condensation

C Melting

D Sublimation

3. Khalid is studying endothermic reactions. He knows that dissolving ammonium nitrate in water is endothermic. What happens to the temperature of the solution?

A Increases

B Decreases

C Remains constant

D Boils

4. George is studying bond formation and bond dissociation. He knows that energy is released when bonds are formed and energy is absorbed when bonds are broken. What is the term for the energy required to break a bond?

A Bond formation energy

B Bond dissociation energy

C Activation energy

D Enthalpy change

5. Patricia is studying the difference between exothermic and endothermic reactions. She knows that the enthalpy change is negative for exothermic and positive for endothermic. Which of the following has a positive ΔH?

A Burning of coal

B Photosynthesis

C Respiration

D Neutralization

6. What happens to surroundings in an exothermic reaction?

A They cool down

B They gain heat

C No change

D They lose mass

7. Hina is studying the products of anaerobic respiration in humans. She knows that during strenuous exercise, muscles produce lactic acid. What happens to the lactic acid?

A It is excreted in urine

B It is broken down in the liver after oxygen is available

C It remains in muscles permanently

D It is converted to glucose immediately

8. Which statement is true for exothermic reactions?

A Products have more energy

B Reactants have less energy

C Energy is absorbed

D Energy is released

9. Rachel is studying the system and surroundings. She knows that in an endothermic reaction, heat is absorbed from the surroundings. What happens to the temperature of the surroundings?

A Increases

B Decreases

C Remains the same

D Fluctuates

10. Emma is studying bond dissociation energy. She compares the bond dissociation energies of H-H (436 kJ/mol) and Cl-Cl (243 kJ/mol). Which bond is stronger?

A H-H

B Cl-Cl

C Both are equally strong

D Cannot be determined

Chapter 8: Energetics

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