BOND ENERGIES AND ENTHALPY CHANGES
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17 Terms
what is bond breaking?
endothermic
why is breaking bonds endothermic?
energy must be supplied to break bonds
what is bond formation?
exothermic
why is forming bonds exothermic?
energy is released when new bonds are formed
why is the enthalpy change in an endothermic reaction positive?
energy used to break the bonds is more than needed to make them
how to calculate enthalpy change?
break - make
why is the enthalpy change in an exothermic reaction negative?
energy used to make the bonds is more than needed to break them
define exothermic reaction
one which gives out energy to the surroundings in the form of heat
define endothermic reaction
takes in energy from the surroundings in the form of heat
exothermic reaction profile
jump down
activation energy formula
Ea
define activation energy
the minimum amount of energy the reactants need to collide with eachother and react
reaction profile of endothermic reaction
jump up
only reaction not exothermic
thermal decomposition
energy transferred equation
Q = mcΔT
how to calculate molar enthalpy change (4)
convert joules to kJ
find the moles of fuel
divide the energy by the moles
add the sign
affect of catalyst on reaction profile
lower activation energy
lower jump up/down