Which choice represents a compound?Required to answer. Single choice. (1.5 Points)

Cu

Fe

CO

Br​

1. and 2. question: in which equation? or i don't understand you, 3. a), 4. c), 5. c), 6. b), 7. d), 8. d) if small number is underlined(behind symbol) , b) if big number is underlined(in front of symbol)9. what is underlined there? 10. c)

Show and image of the mixtures or write them