What occurs when two fluorine atoms react to produce a fluorine molecule? 1. energy is absorbed as a bond is broken. 2. energy is absorbed as a bond is formed. 3. energy is released as a bond is broken. 4. energy is released as a bond is formed.

Which is a chemical property of iron? a. it forms iron oxide (rust) when exposed to moisture and air. b. it is a gray–black metal that is hard to the touch. c. it has a melting point of 2795°f (1536°c). d. it is a good conductor of heat

What is the ph of a 0.0010 m hno3? 1.0 3.0 4.0 5.0

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.