Given the following reactions CaCO3 (s) → CaO (s) + CO2 (g) ΔH = 178.1 kJ C (s, graphite) + O2(g) → CO2(g) ΔH = -393.5 kJ the enthalpy of the reaction CaCO3 (s) → CaO (s) + C (s, graphite) + O2 (g) is kJ. A -215.4
B 215.4
C 7.01 × 104
D 571.6
E -571.6

Identify the electromagnets with poles that are reversed from the electromagnet shown above

What human activity increases beach erosion?

Select all of the statements which are true. electrons are located in shells or orbits around the atom. electrons orbit slowly around the atom. electrons travel in one flat path around the nucleus of an atom. the valence of an atom is determined by the number of electrons in the atom's outermost shell.