In a spontaneous change, which of the following is true?

entropy always decreases.

temperature always increases.

gibbs free energy always decreases.

gibbs free energy always increases.

Gibbs free energy always decreases.

Explanation:

Entropy always decreases. False. For a spontaneous reaction entropy always increases.

Temperature always increases. False. A reaction may be spontaneous at high or low temperatures.

Gibbs free energy always decreases. True. For a spontaneous reaction Gibb’s free energy always decreases. ΔG is < 0. Gibb's free energy equation is:

ΔG = ΔH -TΔS

Gibbs free energy always increases. False.

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.

let that person have a turn to speak : )