Cuál es la clasificación de las siguientes reacciones químicas según la cantidad de reactantes y productos y según la energía (1p c/u, total 6p): a) 2CO (g) + O 2(g) 2CO2(g) b) 2 HI (g) H 2(g) + I 2(g) c) Pb(NO) 2(ac) + 2KI (ac) PbI 2(s) + 2KNO 3(ac) d) C (s) + H 2 O (l) CO (g) + H 2(g) + 240 Kcal e) N 2(g) +3 H 2(g) 2NH 3(g) f) CO2 (g) + H 2 O (l) + Luz C6 H12 O6 (g) + O2 (g)

Asolution contains 225 g of sodium chloride, nacl, dissolved in enough water to make a 0.25 l of solution. what is the molarity of the solution? a. 3.88 m, b. 1.03 m, c. 1.5 m, d. 15.5 m

Which explanation is true about what happens to a ray of light when it strikes a mirror? a. a light ray is transmitted toward a mirror at a certain angle. the light ray is then reflected by the mirror at an equal angle but in the opposite direction of the transmitted ray. b. an incident ray strikes a mirror at an angle with a line perpendicular to the mirror. the light ray is then reflected at an angle equal to the angle of incidence but on the opposite side of the perpendicular line. c. a reflecting ray strikes a mirror at an angle with a line perpendicular to the mirror. the light ray is then refracted at an angle equal to the angle of the reflecting ray and on the same side of the perpendicular line. d. an incident ray strikes a mirror at an angle with a line parallel to the mirror. the light ray is then transmitted at an angle equal to the angle of incidence but on the opposite side of the parallel line. you so much! : -d take the time to try and answer correctly.

Ican determine the molar mass of an element by looking on the under the atomic mass for the element. for example the molar mass of phosphorus is 30.974 grams/mole. avogadro’s number tells me the amount of representative particles in 1 mole of any substance. this means 12.011 gram sample of carbon and a 32.0 gram sample of sulfur have the same number of atoms.