0
Verified answer
a non spontaneous reaction is a reaction that doesnt occur naturally and it normally tends to favor the reactants of a chemical reaction. Another thing is that it doesnt really produce free energy
the gibbs free energy for the reaction is positive
This is a reaction that takes place on its own without an external force and another reaction needed to drive it. (It might not take place very quickly, however.) An iron nail rusting is spontaneous. Wood burning is spontaneous (even though you you often would use a spark to start it burning, it keeps on burning by itself.) Recharging a battery is a non-spontaneous reaction. It requires a continual supply of current to keep the reaction going.
OMG Why do so many people have different opinions.
For my apex question: Which of the following describes a spontaneous reaction?
answer: The Gibbs free energy for the reaction is negative.
A spontaneous reaction is one that occurs without the need for external assistance or input. It proceeds on its own accord due to a favorable change in entropy and/or enthalpy. It does not necessarily mean the reaction happens quickly, but rather that it can occur under the given conditions without added energy input.
In order to determine whether a chemical reaction is spontaneous, one has to consider both entropy and the enthalpy of the reaction in the form of Gibbs free energy. When Gibbs Free Energy takes a negative value, the reaction is said to be spontaneous and will freely occur without further input. If Gibbs Free Energy is positive, energy in some form will need to be put into the system to get it to react (electrolysis)
G = dH - TdS
dH= enthalpy ( in joules)
dS = entropy (jol/K)
T= temperature in K
G = gibbs free energy (jol/K)
These are all values found in the index of a chemistry book
To calculate for a chemical reaction, one considers the combined values of H and S for the products and reactants in order to derive the equation for the full gibbs free energy.
And always remember reactants - products
ex 2Na + Cl2------> 2NaCl
G= H - ST
g=[ (2dH NaCl) - (2dH Na + dH Cl2) ] - 273K[ (2dS NaCl) - (2dS Na + dS Cl2)]
If H were to take a high positive value, the reaction would need a lot of heat in order to make the value of TS greater than the value of H so that G is negative.
If the value of S is very large negativevalue then a really small T value would need to be achieved to compensate.
A reaction that occurs without the input of energy from an external source. For example, it doesn't need heat to start it, it just happens
A spontaneous reaction does not need a source of external energy.
A reaction that occurs without provocation from an outside system is?
A spontaneous reaction.
Which of the following would most likely be spontaneous?
A reaction that produces heat
What is the reaction in a fuel cell spontaneous and non spontaneous?
In a fuel cell, the overall redox reaction is spontaneous, meaning it proceeds on its own without an external power source. The electrode reactions that occur at the anode and cathode are also spontaneous, as they involve the transfer of electrons from the fuel to the oxidant. This spontaneous reaction generates electrical energy that can be used to power devices.
What is the difference between a reaction that happens spontaneously and a reaction that doesn't?
The difference can be clarified by entropy (the second rule of thermodynamics).The reaction is more spontaneous with higher entropy, for the reactions that occur spontaneously the entropy is higher than for the ones that do not.
Which statement describes a reaction at 298 K if H 31 kJ mol S 0.093 kJ molK?
It is not spontaneous.
Ask us anythingWhich of the following describes a nonspontaneous reaction?
a non spontaneous reaction is a reaction that doesnt occur naturally and it normally tends to favor the reactants of a chemical reaction. Another thing is that it doesnt really produce free energy
Which best describes a galvanic cell a battery containing a non spontaneous reaction a battery containing an acid and a base a battery containing a spontaneous redox reaction a battery that requires?
spontaneous redox reaction
Which of the following describes a cytotoxic autoimmune reaction?
Which of the following (what)?
What statement describes a reaction at 298 K if H 31 kJmol S 0.093 kJ(molK)?
It is not spontaneous.
A reaction that occurs without provocation from an outside system is?
A spontaneous reaction.
A chemical reaction has a positive H value and a positive S value Under what conditions is the reaction spontaneous?
The spontaneity of a reaction is determined by the sign of the Gibbs free energy (ΞG). If both enthalpy (H) and entropy (S) are positive, the reaction can be spontaneous at high temperatures where the TΞS term outweighs the positive ΞH term, resulting in a negative ΞG. This means the reaction will be spontaneous at elevated temperatures.
Is candle burning a spontaneous or non spontaneous reaction?
Candle burning is a spontaneous reaction. It is an exothermic reaction that occurs naturally and releases heat and light energy as the wax is being oxidized in the presence of oxygen from the air.
which of the following describes an endothermic reaction?
Hf, products > hf, reactants
Which of the following would most likely be spontaneous?
A reaction that produces heat
How do you determine whether a reaction is spontaneous or non spontaneous?
A reaction is spontaneous if the Gibbs free energy change (ΞG) is negative. This means that the reaction can proceed without external energy input. In contrast, a reaction is nonspontaneous if ΞG is positive, meaning external energy is needed for the reaction to occur.
Which do the following best describes a neutralization reaction?
A neutralization reaction has as reactants a base and an acid and as products water and a salt.
What is the following best describes a neutralization reaction?
An acid-base reaction that leaves no excess H+ or OH-
