Which equation represents a single replacement reaction? A)
AlCl3(aq) + 3KOH(aq) + Al(OH)3(s) + 3KCl(aq)
B)
2AlCl3(s) 2Al(s) + 3Cl2(g)
C)
2Al(s) + 3Cl2(g) → 2A1C13(s)
D)
2Al(s) + 6HCl(aq) + 2AlCl3(aq) + 3H2(g)

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)

D. most models represent a real world object in a simpler way

The answer is d. hope i !