Exothermic And Endothermic Reactions Flashcards
What is an exothermic reaction?
a reaction which releases heat energy to its surroundings
What enthalpy value is an exothermic reaction?
A negative value
In an exothermic energy level diagram, describe the positions of the reactants and products
Reactants higher enthalpy than products because products have lost heat
Example of exothermic reaction?
Neutralising acid with alkali
What is an endothermic reaction?
A reaction which absorbs heat from its surroundings
Example of endothermic reaction?
Heating hydrous copper sulfate
What is the enthalpy value for an endothermic reaction?
A positive value
In an endothermic energy level diagram, describe the position of the reactants and products
Products higher enthalpy than reactants as products have gained heat
What is amount of heat released/absorbed dependent on?
Quantity of reactants
What unit measures amount of heat absorbed/released?
kJmol-1
