Which substance has AHf defined as 0 kJ/mol?
O H20 (s)
O Ne (1)
O F2 (g)
O CO2 (g)

In all living cells dna controls cellular activities by

The diagram shows the structures of horse and cat forelimbs. what does the diagram suggest about the evolutionary relationship between these two mammals? a. they have homologous structures, indicating a common ancestor. b. they have analogous structures, indicating a common ancestor. c. they have homologous structures, indicating that they do not have a common ancestor. d. they have analogous structures, indicating that they do not have a common ancestor.

In numbering carbon atoms in the parent chain of a hydrocarbon, why would you number from right to left, rather than left to right