Chemical Energetics Flashcards
What are the characterics of an exothermic reaction
- Heat is lost from the reactants and transferred to the surroundings
- The temperature of the reaction mixture increases
What are the characteristics on an endothermic reaction?
- Heat is absorbed from the surroundings and transferred to the reactants
- The temperature of the reaction mixture decreases
What is the relative energy of the reactants and the products in an exothermic reaction?
The total energy of the products is lower than the total energy of the reactants
What is the relative energy of the reactants and the products in an endothermic reaction?
The total energy of the products is greater than the total energy of the reactants
What are the energy changes that happen during bond breaking?
During bond breaking, energy is absorbed from the surroundings, causing a decrease in temperature. Is an endothermic process
The amount of energy absorbed depends on the strength of the bond being broken
What are the energy changes that happen during bond forming?
During bond forming, energy is released to the surroundings, causing a increase in temperature. Is an exothermic process
The amount of energy released depends on the strength of the bond being broken
Define
Bond energy
The energy absorbed to break one mole of bond or energy released when one mole of the same bond is formed
What is the formula for enthalpy change?
H= heat absorbed in bond breaking in reactants + heat released in bond making of products
What is the definition of activation energy?
The minimum amount of energy that reacting particles need to possess in order for chemical reaction to occur
