No, many exothermic reactions need the heat of activation to start the reaction. Paper, for instance, does not spontaneously burst into flame... you need to raise its temperature to the kindling point for it to burn.
All reactions need some activation energy. With a endothermic reaction it is absorbing energy from its surroundings. So endothermic reactions can be spontaneous if there is sufficient energy in its surrounding but if there is not then it will never happen. To answer your question endothermic reactions are always nospontanius.
No, but usually they are because an exergonic reaction means ∆G is negative, usually indicating that ∆S (the entropy, or disorder) is very high. Spontaneous reactions run in the direction that creates the most disorder.
Chemical reactions are only spontaneous when ∆Gº is negative. An since ∆Gº = ∆Hº - T∆Sº, ∆G will always be negative if ∆H is negative and ∆S is positive.
Yes. An exergonic reaction is a reaction with a negative change in Gibbs Free Energy. By definition, this is a spontaneous reaction.
One example is to put your hand accidentally on a very hot plate - the response to withdraw your hand is very spontaneous.
yes.
no
The reactions between metals and acids are always endothermic.
Endothermic reaction = absorbs energyExothermic reaction = releases energy
exothermic
Exothermic reactions give out heat; Endothermic ones absorb heat.
The reverse reaction is endothermic and nonspontaneous.
No, chemical reactions can be endothermic or exothermic.
All ENDOthermic reactions are of course ENDOthermic by themselves, aren't they?
"Activation Energy reactions"; Endothermic reactions require energy.
The reactions between metals and acids are always endothermic.
Endothermic reaction = absorbs energyExothermic reaction = releases energy
Endothermic reactions require energy while exothermic reactions release energy.
exothermic
Exothermic reactions give out heat; Endothermic ones absorb heat.
exothermic reactions are the reactions which give out heat and endothermic reactions are the reaction which absorb heat.so combustion is an exothermic reaction.
endothermic reactions
The sum of the voltages of the oxidatiin and reduction half-reactions is negative.
The sum of the voltages of the oxidatiin and reduction half-reactions is negative.