flashcards & answering structures

Cards (9)

explain, in terms of bond breaking or forming, why this is an exothermic reaction
more energy is released to the surroundings during bond forming than needed for bond breaking
explain, in terms of bond breaking or forming, why this is an endothermic reaction
more energy is absorbed from the surroundings during bond breaking than needed for bond forming
what happens to the energy and temperature during an exothermic reaction?
energy is released to the surroundings and final temperature is higher than initial temperature,, reactants lose energy
what happens to the energy and temperature during an endothermic reaction?
energy is absorbed from the surroundings and final temperature is lower than initial temperature,, reactants gain energy
what is enthalpy change and how to measure it?
enthalpy change is a measure of the difference in heat energy between the reactants and products
formula is total energy absorbed during bond breaking - total energy released during bond forming
what are the 3 exothermic reactions?
neutralization, respiration and combustion
what are the 3 exothermic processes
freezing, condensation, dissolution of acids and alkalis
what are the 2 endothermic reactions?
photosynthesis and thermal decomposition
what are the 4 endothermic processes? 
boiling, melting, sublimation, dissolution of some ionic ompounds