CHEM PLZ PLZ HELP Explain the energy changes that occur when the following reaction happens:
H2 + Cl2 → 2HCl
Select all that are correct.

Question 9 options:

Energy is absorbed when the HCl bonds form.

Energy is needed to break the bonds of H-H in H2 and Cl-Cl in Cl2

Energy is released when the bonds of H-H in H2 and Cl-Cl in Cl2 break.

Energy is released when the H-Cl bonds form.

No energy changes occur when this reaction happens.

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.

Which statement describes the phase change that occurs when dry ice is placed in an open container at room temperature?

Give one example of a pure (exact) number and of an estimated (measured) number.