Limestone stalactites and stalagmites are formed in caves by the following reaction: ca2+(aq)+2hco−3(aq)→caco3(s)+co2(g) +h2o(l) if 1 mol of caco3 forms at 298 k under 1 atm pressure, the reaction performs 2.49 kj of p−v work, pushing back the atmosphere as the gaseous co2 forms. at the same time, 38.90 kj of heat is absorbed from the environment.

Click the button that shows the correct relationship of the electron affinities of the elements sodium and phosphorus. sodium’s electron affinity value is more negative than the electron affinity value of phosphorus. phosphorus’ electron affinity value is more negative than the electron affinity value of sodium. this information cannot be determined using the periodic table. answer is b on e2020.

How could a student test the effect of removing heat from a gas that is stored in a sealed container? what must occur in order for matter to change states?

At 20°c, a sample of h2o liquid and a sample of co2 gas each have the same average kinetic energy. why is one a liquid and the other a gas at this temperature?