The statement or situation that portrays inadequate data is the third one: Rupal determines aluminum is the most reactive metal by completing only half of her experiment. By not completing the experiment, this student has obtained inadequate data and reached a wrong conclusion. The most reactive metal (the most likely to undergo a chemical reaction in contact with water, acids, and steam, for instance) in the reactivity series list is actually potassium, not aluminum (although aluminum is indeed a very reactive metal).
Yes, I think that identifying the purpose would increase the credibility of the source, so if we understand the "should" here as "would be good if, is recommended" - then this statement is true.
Including the intent of the information in the source will help place the information in a wider context - and often the context is necessary to fully understand the content of a source.
The War of 1812 is unusual in that both nations believe their country to have won the war. In the United States, this was extremely signficant as a way to unify the nation by creating a strong national identity. Prior to this war, Americans did not feel unified, as people focused more on their belonging to a particular colony than to the nation. However, the threat of a foreign nation attacking the United States contributed to developing a sense of unity. Because of this, the war has been called the "second war of independence."
