Concept explainers
(a)
Interpretation:
The value of
Concept introduction:
The amount of heat consumed or given off during the course of a reaction is known as enthalpy of reaction. Heat is given off when bonds are formed and heat is consumed when bonds are broken.
Heat is one form of energy.
The amount of energy required to break a
(b)
Interpretation:
The value of
Concept introduction:
The amount of heat consumed or given off during the course of a reaction is known as enthalpy of reaction. Heat is given off when bonds are formed and heat is consumed when bonds are broken.
Heat is one form of energy.
The amount of energy required to break a chemical bond is referred to as bond dissociation enthalpy.
(c)
Interpretation:
It should be identified that whether the given reactions (addition of HCl to ethene and addition of dihydrogen to ethene) are exothermic or endothermic in nature.
Concept introduction:
The amount of heat consumed or given off during the course of a reaction is known as enthalpy of reaction. Heat is given off when bonds are formed and heat is consumed when bonds are broken.
Heat is one form of energy.
The amount of energy required to break a chemical bond is referred to as bond dissociation enthalpy.
A reaction with a negative
A reaction with a positive
(d)
Interpretation: It should be identified that whether the given reactions (addition of HCl to ethene and addition of dihydrogen to ethene) are exergonic or endergonic in nature.
Concept introduction:
The amount of heat consumed or given off during the course of a reaction is known as enthalpy of reaction (H). Heat is given off when bonds are formed and heat is consumed when bonds are broken.
Heat is one form of energy.
The amount of energy required to break a chemical bond is referred to as bond dissociation enthalpy.
The mathematical relationship between enthalpy (H) and free energy (G) is,
In an exergonic reaction the products have a lower free energy than it consumes.
In an endergonic reaction the product have a higher free energy than it consumes.
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