Find the AH' for the reaction of two moles of aqueous ammonium hydroxide and one mole of aqueous calcium chloride that produces two moles of aqueous ammonium
chloride and one mole of solid calcium hydroxide. (Hint: Be careful looking up the AH
for ammonium chloride and calcium hydroxide.)
2NH, OH(aq) + CaCl(aq) 2NH, Cl(aq) + Ca(OH)2(s)

answer: lol

explanation:

lol

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 option a.