The table below describes the temperature of different colors of stars.

Color Temperature
red under 3,500 K
orange-red 3,500 - 5,000 K
white-yellow 5,000 - 6,000 K
blue-white 6,000 - 7,500 K
blue 7,500 - 25,000+ K

If the Sun is white-yellow, which of the following is a reasonable approximation of its temperature?

red

Explanation:

The stars can be classified in many ways, including by mass, color, and temperature. The color and the temperature of a star are usually related.

Antares is a red supergiant.

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.