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Created page with "==Key Stage 4== ===Meaning=== '''Bond Energy''' is the energy needed to break a chemical bond between two atoms. ===About Bond Energy=== : When Ch..."
==Key Stage 4==
===Meaning===
'''Bond Energy''' is the [[energy]] needed to break a [[Chemical Bond|chemical bond]] between two [[atom]]s.
===About Bond Energy===
: When [[Chemical Bond|chemical bonds]] are formed [[energy]] is released to the surroundings increasing the [[temperature]]. An [[exothermic]] process]].
: To break [[Chemical Bond|chemical bonds]] [[energy]] is needed to separate the [[atom]]s, decreasing the [[temperature]] of the [[surroundings]]. An [[endothermic]] process]].
===Examples===
Some common '''bond energies''' are given in the table below.
{| class="wikitable"
|-
| style="height:20px; width:100px; text-align:center;" |'''Bond'''
| style="height:20px; width:150px; text-align:center;" |'''Energy in kJ/mol'''
|-
| style="height:20px; width:100px; text-align:center;" |H-H
| style="height:20px; width:150px; text-align:center;" |436
|-
| style="height:20px; width:100px; text-align:center;" |O=O
| style="height:20px; width:150px; text-align:center;" |498
|-
| style="height:20px; width:100px; text-align:center;" |N≡N
| style="height:20px; width:150px; text-align:center;" |941
|-
| style="height:20px; width:100px; text-align:center;" |C-C
| style="height:20px; width:150px; text-align:center;" |347
|-
| style="height:20px; width:100px; text-align:center;" |C=C
| style="height:20px; width:150px; text-align:center;" |614
|-
| style="height:20px; width:100px; text-align:center;" |C≡C
| style="height:20px; width:150px; text-align:center;" |839
|-
| style="height:20px; width:100px; text-align:center;" |C-H
| style="height:20px; width:150px; text-align:center;" |413
|-
| style="height:20px; width:100px; text-align:center;" |O-H
| style="height:20px; width:150px; text-align:center;" |464
|-
| style="height:20px; width:100px; text-align:center;" |C=O
| style="height:20px; width:150px; text-align:center;" |799
|-
| style="height:20px; width:100px; text-align:center;" |Cl-Cl
| style="height:20px; width:150px; text-align:center;" |243
|-
| style="height:20px; width:100px; text-align:center;" |H-Cl
| style="height:20px; width:150px; text-align:center;" |432
|-
| style="height:20px; width:100px; text-align:center;" |N-H
| style="height:20px; width:150px; text-align:center;" |391
|}
===Meaning===
'''Bond Energy''' is the [[energy]] needed to break a [[Chemical Bond|chemical bond]] between two [[atom]]s.
===About Bond Energy===
: When [[Chemical Bond|chemical bonds]] are formed [[energy]] is released to the surroundings increasing the [[temperature]]. An [[exothermic]] process]].
: To break [[Chemical Bond|chemical bonds]] [[energy]] is needed to separate the [[atom]]s, decreasing the [[temperature]] of the [[surroundings]]. An [[endothermic]] process]].
===Examples===
Some common '''bond energies''' are given in the table below.
{| class="wikitable"
|-
| style="height:20px; width:100px; text-align:center;" |'''Bond'''
| style="height:20px; width:150px; text-align:center;" |'''Energy in kJ/mol'''
|-
| style="height:20px; width:100px; text-align:center;" |H-H
| style="height:20px; width:150px; text-align:center;" |436
|-
| style="height:20px; width:100px; text-align:center;" |O=O
| style="height:20px; width:150px; text-align:center;" |498
|-
| style="height:20px; width:100px; text-align:center;" |N≡N
| style="height:20px; width:150px; text-align:center;" |941
|-
| style="height:20px; width:100px; text-align:center;" |C-C
| style="height:20px; width:150px; text-align:center;" |347
|-
| style="height:20px; width:100px; text-align:center;" |C=C
| style="height:20px; width:150px; text-align:center;" |614
|-
| style="height:20px; width:100px; text-align:center;" |C≡C
| style="height:20px; width:150px; text-align:center;" |839
|-
| style="height:20px; width:100px; text-align:center;" |C-H
| style="height:20px; width:150px; text-align:center;" |413
|-
| style="height:20px; width:100px; text-align:center;" |O-H
| style="height:20px; width:150px; text-align:center;" |464
|-
| style="height:20px; width:100px; text-align:center;" |C=O
| style="height:20px; width:150px; text-align:center;" |799
|-
| style="height:20px; width:100px; text-align:center;" |Cl-Cl
| style="height:20px; width:150px; text-align:center;" |243
|-
| style="height:20px; width:100px; text-align:center;" |H-Cl
| style="height:20px; width:150px; text-align:center;" |432
|-
| style="height:20px; width:100px; text-align:center;" |N-H
| style="height:20px; width:150px; text-align:center;" |391
|}