Question

The definition of a spontaneous reaction is:

A reaction that always absorbs free energy

A reaction that requires an input of heat

A reaction that occurs without outside interference

A reaction that produces more products than reactants present

Answer 1

hi ! do you know the word ,,spontan" what mean ? from this try understanding what can mean a spontaneous reaction ...

Answer 2

hope this will help you : ,,a spontaneous reaction is a reaction that occurs in a given set of conditions without intervention"

Answer 3

so from these choices how you think what satisfy this condition ?

Answer 4

If it occurs without outside intervention, then I think it might be the 3rd choice right?

Answer 5

exactly - so this mean that you ve understood it right

have a nice day

bye bye

Answer 6

Yes @jhonyy9 is right, but let me introduce you to a deeper understanding:

A process has 3 components (essentially two). Enthalpy and Entropy. Note that Gibb's Free energy is defined as
\[∆G°=∆H°-T∆S°\]
A thermodynamically favorable reaction, or rather termed as spontaneous, is where \(∆G°<0\), or where the universe "wants" the process to happen.

Think about it this way: you have a ball on a slope. Either the ball could travel up the slope or roll down. Without any intervention, the universe "wants" the ball to roll down. The reason could be anything (i.e., in this case you would name gravity), but that reason doesn't matter. All ∆G means is whether the process of rolling up or down is favorable, and in this case, rolling down is spontaneous, rolling up is nonspontaneous. It requires intervention to let the ball travel upward.

Processes play the same way. The universe could either "want" a process to happen or not happen without any energy, and that is termed as either spontaneous or nonspontaneous.