What is the difference between a phase and a phase transition?
a. a phase is a region with homogeneous (uniform) properties and a conversion between states is called a "phase transition"
c. a phase is a physical property and a phase transition is a chemical change.
b. a phase is a chemically distinct state of matter and a phase transition is a chemical change.
d. none of the above?

a. A phase is a region with homogeneous (uniform) properties and a conversion between states is called a "phase transition"

Explanation:

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In this case, we first must consider that a phase is defined in terms of the molecular distribution of a substance, therefore, for a single phase, its properties must be homogeneous to be considered as it. On the flip side, the phase transition is the correct term regarding the "change of state" of a substance, say melting, freezing, deposition, sublimation, condensation and boiling. Consequently, the answer is:

a. A phase is a region with homogeneous (uniform) properties and a conversion between states is called a "phase transition"

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answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.

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explanation: