A 25.0 gram sample of a solid metal was heated to 100.0°C and dropped into a calorimeter containing 90.0 grams of water at 25.32°C. If the final temperature of the water and the metal was 28.78°C, calculate the specific heat of the metal.

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.

b is the correct answer

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a electronegativity decreases beacuse the size of nucleus is bigger.