Phosphorus trichloride, pcl3, decomposes to form elemental phosphorus and chlorine. the equation is: 4pcl3 → p4 + 6cl2. balance the equation and determine the mass in grams of chlorine that would be formed if 25 grams of pcl3 (molecular mass = 137.32 g/mol) decompose.

16. why must the number of electrons lost equal the number of electrons gained in every redox reaction? use 3 – 4 sentences in your own words to address this question. 18. what type of radiation is emitted when chromium-51 decays into manganese-51? show the nuclear equation that leads you to this answer. 19. a radioactive nucleus alpha decays to yield a sodium-24 nucleus in 14.8 hours. what was the identity of the original nucleus? show the nuclear equation that leads you to this answer.

Elements in group 2 are all called alkaline earth metals. what is most similar about the alkaline earth metals?

Which of the following is the correct definition of chemical energy? a. energy an object has because of its motion or position b. energy resulting from the flow of charged particles, such as electrons or ions c. energy produced from the splitting of atoms d. energy stored in chemical bonds of molecules