In the following overall chemical reaction, aluminum displaces chromium from chromium(iii) oxide and forms aluminum oxide.
2 al(s) + cr2o3(s) → 2 cr(s) + al2o3(s); δh = ?
find the change in enthalpy for this reaction, using hess' law and the enthalpy changes for the reactions given below.
(1a) 4 al(s) + 3 o2(g) → 2 al2o3(s); δh = −3351.4 kj
(2a) 4 cr(s) + 3 o2(g) → 2 cr2o3(s); δh = −2279.4 kj

How many orbitals does the p sub shell container

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.

The chemical bond connecting one nucleotide with the next one along the nucleic acid chain is called a