What did the DNA say to the other DNA?

What happened in 2012 and how does it illustrate the importance of understanding the sun and how it works?

What are transitions between a liquid and a solid called? identify which way they are transitioning

What mass of iron must be in a hot pack to provide -335kj of heat when the iron reacts with oxygen and is converted to iron (111) oxide according to the following thermochemical equation? 2fe(s) + 1.5o2(g)—> fe2o3(s) delta h= -824.2kj/mol