Given these values ΔH°f (C2H4(g)) = 52.3 kJ/mol; ΔH°f(C2H6(g)) = –84.7 kJ/mol, calculate the standard enthalpy change of reaction, ΔH°rxn, for: 2H2(g) + 2C2H4(g)!2C2H6(g)

What rule is used to determine how many covalent bonds an element can form? a. the number of covalent bonds is equal to six c the number of covalent bonds is equal to five minus the group number plus the group number b. the number of covalent bonds is equal to eight d. none of the above minus the group number select the best answer from the choices provided

Which is a characteristic of the electron sea model for metallic bonding? molecular orbitals overlap to produce bands. electrons flow easily between metal nuclei. electrons are in fixed positions in the orbitals. atomic nuclei are arranged in an irregular pattern.

The plant food contains nh4)3po4 what tests would you run to verify the presence of the nh4 ion and the po4 ion