An endothermic reaction takes in heat from its surroundings. One example of a spontaneous endothermic reaction is an ice pack that doesn't have to be kept in the freezer. When the ice pack is struck with your palm the membrane is broken and the salt is dissolved in the water. The equation would be NH4NO3 plus H2O is equal to NH4 plus NH3.
Sometimes yes, sometimes no.
endothermic, increasing entropy
Generally exothermic as neutralization is a spontaneous reaction.
Reactions are described by this equation: GD = HD - TDS where D = delta for change in values. GD < 0 spontaneous HD < 0 exothermic ; HD > 0 endothermic The first equation is Gibbs free energy. When G is negative, the reaction is spontaneous. In contrast, a positive number G is non spontaneous. The interesting thing is that spontaneous reactions can be EITHER exothermic and endothermic. Lets look at this: lets assume HD has a value of 100. This means TDS would have to be bigger than 100 in order to make GD a negative number. An endothermic reaction which has a positive H can still be exothermic. Here's another way to pose your question: Is an exothermic reaction spontaneous? Always. Is an endothermic reaction spontaneous? This can be either.
spontaneous in the reverse direction at all temperatures.
The reverse reaction is endothermic and nonspontaneous.
The reverse reaction is exothermic and spontaneous.
PLEASE don't ask these questions
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.
The reverse reaction is endothermic and spontaneous.
It is a exothermic reaction. It is not a endothermic reaction.
For some non-spontaneous reactions, you can change the temperature. For other non-spontaneous reactions, there is nothing you can do to make it spontaneous. Nature favors reactions that increase a system's entropy (disorder) and nature favors reactions that are exothermic (they release enthalpy). Any reaction that does both of these things is spontaneous at all temperatures. Any reaction that does neither of these things is never spontaneous. As far as this question is concerned, the interesting reactions are endothermic reactions that increase entropy and exothermic reactions that decrease entropy. Whether these reactions are spontaneous depends on the temperature. The first variety (endothermic, increase entropy) will be spontaneous at high temperatures; the second (exothermic, decrease entropy) will be spontaneous at low temperatures. To find the temperature at which a reaction becomes spontaneous, one may apply the Gibbs equation: DG = DH - TDS where capital Ds stand for the Greek capital delta.
yes it is a endothermic reaction
This is an endothermic reaction.
There are two types of reactions, thermally. Endothermic and exothermic. An endothermic reaction absorbs heat and an exothermic reaction releases it.
Photosynthesis is considered an endothermic reaction and is not an exothermic reaction. This is one of the most important endothermic reactions.
An endothermic reaction need heat to occur.
An endothermic reaction need heat to begin.