Use the data in the steam table(s) to answer the following: a. find the change in internal energy when 100 kg of steam at constant pressure p 0.1 mpa has its temperature reduced from 573.15 k to 373.15 k. b. find the change in internal energy when 100 kg of liquid water at constant pressure p 20 mpa has its temperature increased from 513.15 k to 573.15 k. c. what is the change in specific volume for both parts a and b above?

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 potential energy of the reactants is 200j.

from the energy diagram, the energy of the product formed is 350j; this means that, this reaction is an endothermic reaction, because it absorbs energy from its environment.