The following heats of formation are used to find the change in enthalpy for the formation of tin chloride in the following reaction

Sn (s) + 2Cl2(g) --> SnCl4(l)

Sn(s) + Cl2(g) --> SnCl2(l) ; ΔH = -186.2 kJ

SnCl2(s) + Cl2(g) --> SnCl4(l) ; ΔH = -325.1 kJ

What is the change in enthalpy?

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.

its first and third is your answer i did the qustion the fourth isnt right

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the answer is:  

line graphs show patterns in data with variables that change over time; whereas, circle graphs show data as parts out of a whole (such as out of 100%).