The student created an accurate model of calcium carbonate. The model includes the correct number of gumdrops for each element in calcium carbonate, consistent use of colors for elements in calcium carbonate, and the correct number and placement of toothpicks (bonds).

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.

The best solution for preventing harm to people and pets from severe hurricanes involves determining and warning residents about what

Match the mixture with the substance// i really need on this guys (it’s a pic btw)