What is the enthalpy of reaction for the decomposition of calcium carbonate? ah,(kj/mol) -157.3 caco3(s) → cao(s) + co2(9) -1.207.1 compound cao(s) caco3(s) coh6(9) co2(g) h2o(g) i kj 82.90 done -393.5 -241.82 no2(g) 33.84

Why do cells appear different in distilled water than they do in 10% salt water?

Measurements that have similar values are: a. usually accurate b. sometimes accurate c. always accurate d. never accurate

The image compares the arrangement of electrons in two different neutral atoms. a figure labeled atom q has a shaded sphere at the center of three concentric circles. the innermost circle has two black spheres. the middle circle has six black spheres. to the left of this figure is another figure labeled atom p. atom p has a shaded sphere at the center of three concentric circles. the innermost circle has two black spheres. the middle circle has seven black spheres. which of the following best explains the position of the two atoms in the periodic table?