CBSE - X - Chemistry - Chemical Reactions and Equations
How does the temperature increases during exothermic reaction and decreases during endothermic reaction?
- If the reactants have weak bonds, while the products have strong bonds then the reaction is exothermic (enthalpy change < 0).
- There is a small amount of energy needed to break the bond and a bigger energy released when strong bonds form.
- A negative enthalpy change means that the system releases heat energy.
- If the reactants have strong bonds, but the products have weak bonds its an endothermic reaction. (enthalpy change > 0).
- The energy required to break the reactant bonds is greater than the energy released when the product bonds form.
- A positive enthalpy change means that the system absorbs heat energy.
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