(a)[1]
Explain what the term entropy of a system means.
(b)[3]
State and explain whether the entropy change for each of these processes is positive or negative. Ignore the entropy change of the surroundings. • liquid water at $80\ ^\circ\text{C}$ is cooled to $60\ ^\circ\text{C}$ • solid calcium chloride is mixed into water and the mixture is stirred • the change corresponding to the lattice energy of calcium chloride, $\Delta H_{\text{latt}}\ \text{CaCl}_2(s)$, occurs
(c(i))[1]
State the full name of the term $\Delta G^\circ$.
(c(ii))[2]
Describe how you can calculate the temperature at which the reaction becomes spontaneous. Include an equation in your answer.