Amixture is made of two or more materials that a. can only be separated by chemical means. b. cannot be separated by any means. c. cannot be separated by physical means. d. can be separated by physical means.

Both 1,2−dihydronaphthalene and 1,4−dihydronaphthalene may be selectively hydrogenated to 1,2,3,4−tetrahydronaphthalene. one of these isomers has a heat of hydrogenation of 101 kj/mol (24.1 kcal/mol), and the heat of hydrogenation of the other is 113 kj/mol (27.1 kcal/mol). match the heat of hydrogenation with the appropriate dihydronaphthalene.

Apure solvent has a vapor pressure the vapor pressure of a solution. a. equal to b. lower than c. higher than

Using the periodic table, complete the table to describe each atom. type in your answers.a ? b? c? d? e? f?