Which of the following statements best describes the work of isaac newton? a. it provided some of the earliest evidence in support of a heliocentric theory. b. it led to a greater understanding of the relationship between pressure and volume. c. it focused on gravity and how forces acted on objects. d. it proposed that everything should be doubted until logic proved it true.

An unknown substance is a white solid at room temperature and has a melting point of 78 °c. which of the following substances is most likely to be the identity of the unknown sample? a. naphthalene, a molecular solid with the formula c10h8 b. silica, a network solid held together by covalent bonds with the formula sio2 c. calcium chloride, an ionic compound with the formula cacl2 d. water, an molecular compound with the formula h2o