4. What is the answer to these chemistry bonding questions? a. In phosphorus tri

Question

4. What is the answer to these chemistry bonding questions?

a. In phosphorus trichloride, PCl3, the total number of groups on the central atom is ___________. (1,2,3,4)

b. In phosphorus trichloride, the number of bonding groups on the central atom is ___________. (1,2,3,4)

c. In sulfur difluoride, SF2, the total number of groups on the central atom is ___________. (1,2,3,4)

d. In sulfur difluoride, the number of bonding groups on the central atom is ___________. (1,2,3,4)

e. In formaldehyde, CH2O, the total number of groups on the central atom is ___________. (1,2,3,4)

f. In formaldehyde, the number of bonding groups on the central atom is ___________. (1,2,3,4)

Explanation / Answer

4. What is the answer to these chemistry bonding questions?

a. In phosphorus trichloride, PCl3, the total number of groups on the central atom is ___________. (1,2,3,4)

P has 5 electrons in its valence shell, then if 3 are used to bond with Cl, there are 2 left, which are called lone pairs, then the total groups = 3 atoms + 1 lone pair = 4 groups

b. In phosphorus trichloride, the number of bonding groups on the central atom is ___________. (1,2,3,4)

bonding groups are only those which are actually bonded, i.e. P with Cl

then, the answer is n = 3 bonded groups

c. In sulfur difluoride, SF2, the total number of groups on the central atom is ___________. (1,2,3,4)

total number of groups in central atom = lone pairs + bonded groups

bonded groups = 2, S-F and S-F

lone pairs = S has 6 electrons, 2 are used to bond F therefore, 6-2 = 4 electrons left, which are paired as 2 lone pairs

then

Total groups = 2 lone pairs + 2 bonded groups = 4 groups

d. In sulfur difluoride, the number of bonding groups on the central atom is ___________. (1,2,3,4)

As stated before, there are only 2 bonded groups in SF2

e. In formaldehyde, CH2O, the total number of groups on the central atom is ___________. (1,2,3,4)

Central atom = Carbon

C=O and C-H, C-H; total bonded groups = 3

lone pairs = 0

therefore, bonded group = 3

f. In formaldehyde, the number of bonding groups on the central atom is ___________. (1,2,3,4)

bonding groups, as stated before, are only 3

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