Grade 9 Chemistry: Bond Energy Worksheet
Explore the concepts of bond energy, its role in chemical reactions, and how to calculate enthalpy changes using bond energies.
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Grade 9 Chemistry: Bond Energy
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Read each question carefully and provide your best answer. Show all your work for calculations.
1. What is bond energy?
The energy released when a bond breaks.
The energy required to form a bond.
The energy required to break one mole of a specific bond in the gaseous state.
The energy stored within the nucleus of an atom.
2. An endothermic reaction is one where:
Heat is released to the surroundings.
Heat is absorbed from the surroundings.
No energy change occurs.
Energy is converted into mass.
3. The breaking of chemical bonds energy, while the formation of chemical bonds energy.
4. A chemical reaction is considered exothermic if the total energy released during bond formation is than the total energy absorbed during bond breaking.
5. Explain the relationship between bond energy and the stability of a chemical bond.
6. Why are bond energies typically positive values?
7. Observe the diagram below, which illustrates the formation of a covalent bond. Describe what is happening to the energy during this process.
Match each term on the left with its correct definition on the right.
8. Enthalpy Change
a. The net energy change in a chemical reaction.
9. Exothermic Reaction
b. A reaction that absorbs heat from its surroundings.
10. Endothermic Reaction
c. A reaction that releases heat to its surroundings.