Hi, i have a lab question and i'm kind of confused on how to approach it.

evaluation of molar enthalpy of dissociation of formic acid, deltahdiss.

given:
h1 = -58010 j/mol; h2 = -59758.4j/mol

they tell use to use hess's law to determine the enthalpy of dissociation

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b i think it’s a water wheel turning in a stream

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.