D. as measured along line DE
The volume of 50.0 milliliters of an ideal gas at
STP increases to 100 milliliters. If the pressure
remains constant, the new temperature must be
А. ОК
B.
100 K
C. 273 K
D. 546K

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.

the answer is definitely c.

answerca air mass;