Chapter 16 chemical energies Flashcards
your mother
What Is Exothermic
transfer heat to the surroundings which in turns increases the heat of the surroundings
What is endothermic
takes in heat from surroudings
(decrease in temperature)
Examples of exothermic reactions?
Combustion
Neutralisation
Rusting
Oxidation
respiration
Examples of endothermic
Thermal decomposition
photosynthesis
dissolving of ionic compound
Melting, boiling ( all the states that take in heat)
What is bond energy
amount of energy absorbed to break one mole of chemical bond. Amount of energy released when one mole of that bond is formed
What is bond breaking
exothermic reaction
where energy is absorbed to break bonds
What is bond making
endothermic where
energy is released when bonds are formed
What if the enthaply change is negative?
exothermic
( totak energy of the reactants are higher than the products
What if enthaply change is positive
endothermic
( total energy of the reactants are lower than the products )
What does catalyst do
provide alternate pathway or lower activation energy
for reaction to occur
formula of enthaply change
bond breaking – bond making
Why would a reaction be endothermic
total energy absorbed during bond breaking is more than bond making
why would reactin be exothermic
total energy absorbed during bond breaking is less than total energy in bond making
/wow
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