Based on the clue 'a suburb of dc spring maryland', what is the answer?

Based on the clue 'a substance that can be pervaded by a liquid is sa...', what is the answer? Based on the clue 'a substance that speeds up a chemical reaction', what is the answer? Based on the clue 'a substance to start a fire or the point thats the...', what is the answer? Based on the clue 'a substance whose molecules contain more than one ...', what is the answer? Based on the clue 'a suburb of providence rhode island', what is the answer? What is associated with: a subway platform under state street in this citys loop is the worlds longest at about 3500? Based on the clue 'a successful 11th c invader of britain was this da...', what is the answer? What is associated with: a successful brewer matthew vassar opened his namesake college for women in 1861 in this ny ci…