Why is bond formation an exothermic process?

Energy is released when atoms bond

What does bond energy represent?

Energy required to break a bond

Class 9 Chemistry · Chapter 5 · Test 4

Bond Breaking and Formation

25 MCQs covering bond breaking, bond formation, energy absorbed and released during bonding processes, relative bond strengths, the relationship between bond energies and enthalpy change, and the energy changes involved in chemical reactions.

MCQs

25 questions · 20 min · 25 marks

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Sample questions

The first 5 of 25. Try each one, then tap to see the answer.

Question 1
What happens when a chemical bond is broken?
- AEnergy is absorbed
- BEnergy is released
- CNo energy change occurs
- DMass is destroyed
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Answer: A
Energy is required to break a chemical bond so bond breaking is an endothermic process.
Question 2
What happens when a chemical bond is formed?
- AEnergy is absorbed
- BEnergy is released
- CNo energy change occurs
- DThe atoms disappear
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Answer: B
Energy is released when a new chemical bond is formed.
Question 3
Why is bond breaking an endothermic process?
- AIt requires energy
- BIt always releases energy
- CIt produces heat directly
- DIt destroys atoms
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Answer: A
Energy must be supplied to overcome the attraction holding bonded atoms together.
Question 4
Why is bond formation an exothermic process?
- AEnergy is released when atoms bond
- BEnergy is always absorbed
- CAtoms become unstable
- DNo energy change occurs
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Answer: A
Formation of a chemical bond releases energy as the bonded state is formed.
Question 5
What does bond energy represent?
- AEnergy required to break a bond
- BMass of a bond
- CVolume of a molecule
- DNumber of atoms in a bond
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Answer: A
Bond energy is the energy required to break a particular chemical bond.

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