Astudent mixes a spoonful of sugar into a glass of water and stirs until the sugar dissolves completely. match each substance to its role in the dissolving process.

I believe you are referring to the solvent and solutes in the question... remember, the solvent is what the substance is being dissolved in.  the solute is what is being dissolved.  So, water here acts as a solvent, while sugar is the solute :)

- "the choice that is not an indicator of a chemical change is "state of matter changes". more common than not, chemical reactions produce energy in the form of light or heat. along with energy, they also produce a new substance called the product that could be in any state of matter (solid, gas, or liquid)."

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.