Grade 12 Chemistry: Bond Energy
Explore the concepts of bond energy, enthalpy changes, and their applications in chemical reactions at a Grade 12 level.
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Grade 12 Chemistry: Bond Energy
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Read each question carefully and answer to the best of your ability. Show all your work for calculation-based questions.
1. Which of the following statements best defines bond energy?
The energy released when a bond is formed.
The energy required to break a bond.
The energy stored within a chemical bond.
The change in enthalpy during a reaction.
2. Which type of bond formation is depicted in the illustration below?
Ionic bond
Covalent bond
Metallic bond
Hydrogen bond
3. When chemical bonds are formed, energy is , and when chemical bonds are broken, energy is .
4. A reaction is considered if the energy released during bond formation is greater than the energy absorbed during bond breaking.
5. Explain the relationship between bond energy and the stability of a chemical bond.
Match each term with its correct definition.
6. Endothermic reaction
a. The average energy required to break one mole of a specific type of bond.
7. Exothermic reaction
b. A reaction that absorbs energy from its surroundings.
8. Bond enthalpy
c. A reaction that releases energy to its surroundings.
9. Given the following average bond energies (kJ/mol): C-H: 413 O=O: 498 C=O: 799 O-H: 463 Calculate the enthalpy change (ΔH) for the combustion of methane (CH4): CH4(g) + 2O2(g) → CO2(g) + 2H2O(g)