4.4 Classwork- Bond Energy

Last updated almost 4 years ago

4 questions

Question 1

In the photo below, are bonds being broken, formed, or both? In words, explain what you thing happened in this equation.

More energy is absorbed because 769kJ is larger than 715 kJ.
If more energy is absorbed, this must be endothermic because endothermic reactions absorb energy.

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4.4 Classwork- Bond Energy

Last updated almost 4 years ago

4 questions

Question 1

In the photo below, are bonds being broken, formed, or both? In words, explain what you thing happened in this equation.

Question 2

What would the intermediates of the equation below look like? Draw your answer.

More energy is absorbed because 769kJ is larger than 715 kJ.
If more energy is absorbed, this must be endothermic because endothermic reactions absorb energy.

Question 3

O2 has a bond energy of approximately 498 kJ.
Ca and O have a bond energy of approximately 315 kJ.

1. How much energy is absorbed when all reactant bonds are broken?
2. How much energy is released when the products are formed?
Note: Two CaO bonds are formed so you must double the bond energy.
3. Is more energy absorbed or released?
4. Is this overall endothermic or exothermic?

Question 4

The bond energy of the A-B bond is 250 kJ
The bond energy of the A-C bond is 300 kJ
The bond energy of the B-C bond is 350 kJ

1. How much energy is absorbed to break the reactants into their intermediates?
2. How much energy is released when the products are formed?
3. Does this reaction absorb or release more energy?
4. Is this reaction overall endothermic or exothermic?

Question 2

What would the intermediates of the equation below look like? Draw your answer.

Question 3

O2 has a bond energy of approximately 498 kJ.
Ca and O have a bond energy of approximately 315 kJ.

1. How much energy is absorbed when all reactant bonds are broken?
2. How much energy is released when the products are formed?
Note: Two CaO bonds are formed so you must double the bond energy.
3. Is more energy absorbed or released?
4. Is this overall endothermic or exothermic?

Question 4

The bond energy of the A-B bond is 250 kJ
The bond energy of the A-C bond is 300 kJ
The bond energy of the B-C bond is 350 kJ

1. How much energy is absorbed to break the reactants into their intermediates?
2. How much energy is released when the products are formed?
3. Does this reaction absorb or release more energy?
4. Is this reaction overall endothermic or exothermic?