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Broken Bonds Quick Check
5 of 5
Use the reaction and bond information to answer the question.
dis a
ade of atoms that
electrons in two
when electrons are
e atoms then have
bond. A chemical
form. The breaking
reactions,
CH8 - CH + H2
Reactant bond energies: H-C = 413 kJ/mol, C-C single bond = 347 kJ/mol
Product bond energies: H-C 413 kJ/mol, C=C double bond = 614 kJ/mol, H-H-
432 kJ/mol
Based on the bond energies, is this reaction endothermic or exothermic? Why or why
not?
(1 point)
bonds of the
nergy is called the
nds are not all the
onds are easier to
ble and are harder to
ands,
This reaction is exothermic, because stronger bonds are broken than
formed
The reaction is exothermic, because stronger bonds are formed than
broken
The reaction is endothermic, because stronger bonds are formed than
broken
The reaction is endothermic, because stronger bonds are broken than
formed

Sagot :

mickymike92

Based on bond energies, the reaction is endothermic, because stronger bonds are broken than formed.

What is the total change in bond energy?

The total change in bond energy of a reaction is calculated using the formula below:

  • Total change in bond energy = sum of energies of bonds broken - sum of energies of bonds formed.

A reaction is exothermic if the total change in bond energy is negative meaning that stronger bonds are formed than broken.

A reaction is endothermic if the total change in bond energy is positive meaning that stronger bonds are broken than formed.

Given a reaction such as: C2H6 → C2H4 + H2

Sum of energies of bonds broken:

C-C + 6 × H-C

347 + 6 × 413

Sum of energy of bonds broken = 2825 kJ

Sum of energy of bonds formed:

C=C + 4 × H-C + H-H

614 + 4 × 413 + 432

Sum of energy of bonds formed = 2725 kJ

Total change in bond energy = 2825 - 2725

Total change in bond energy = 100 kJ

Since the value of total change in bond energy is positive, the reaction is endothermic.

Therefore, the reaction is endothermic, because stronger bonds are broken than formed.

Learn more about bond energy at: https://brainly.com/question/16997325

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