Hey chem people! I need some help :) Pls help me i have no clue what to do For numbers 1-8 the options are Shift left, Shift right, no shift
For number nine the options is endothermic, exothermic, isothermic
And finally number tens options are numbers 1-10

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