The chlorination of the iron (III) ion is an endothermic reaction.

Fe^3+(aq) + 2Cl-(aq) ↔ FeCl^2+(aq)

Predict the effect of increasing the reaction temperature.
A) no effect
B) increase in Cl-(aq) concentration
C) increase in Fe3+(aq) concentration
D) increase in FeCl2+(aq) concentration

When scientists mention the words "phase change" they mean:

The change that a substance, element or compound undergoes, which passes within the three states of matter (liquid, solid and gaseous) without changing its chemical properties, this regularly depends on temperature, a widely used example is water, which at sea level changes to a solid state at a temperature of 100 °C, at room temperature it is in a liquid state, and at 100 °C it changes to a gas state.

Explanation:

The phase changes refer to the different changes that a substance undergoes through the states of matter and reflects the physical characteristics that said state contracts (only physical characteristics since the chemical characteristics do not change).