Ineed to know the definition of a cell

Consider the following reactions. (note: (s) = solid, (l) = liquid, and (g) = gas.) mg(s) + ½o2(g) → mgo(s) + 146 kcal/mole h2(g) + ½o2(g) → h2o(g), δh = -57.82 kcal/mole what type of reaction is represented by the previous two examples?

A2-inch, f/6 telescope has a 3-inch eyepiece focal. its magnifying power is: 36x 4x 3x 2x

Design a synthesis of 1-cyano-2-methylbicyclo[2.2.1]-2,5-heptadiene from cyclopentene and any other compounds using a diels-alder cycloaddition reaction. part 1 out of 9 choose the best option for the dienophile precursor to the target molecule.