In order to gain one pound of body weight, the average person must consume 3500 more calories than he/she uses.
Assuming you are totally sedentary and burning no calories, how many chocolate
bars would you need to eat to gain 5 pounds (use the answer from #3 to calculate)

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.

is there any options? maybe im just not seeing them but i need the options to

-love shrooms