Honors chemistry final Flashcards
1
Q
Activation energy
A
energy required to start a reaction
adding a catalyst lowers the activation energy
2
Q
catalyst
A
a substance that increases the rate of a chemical reaction
3
Q
exothermic
A
realease of heat
energy required to break bonds is less than the energy needed to create bonds in products
4
Q
endothermic
A
absorbtion of heat
energy required to break bonds is greater than the energy needed to create new bonds in products
5
Q
enthalpy
A
the heat content of a system at constant preassure
6
Q
endothermic reactions
A
enthalpy values are always posotive
7
Q
exothermic reactions
A
enthalpy values are always negative
